Details of the Researcher

PHOTO

Wang Jiajie
Section
Graduate School of Environmental Studies
Job title
Assistant Professor
Degree

  • 博士（環境科学）（東北大学）

  • 修士（厦門大学）

e-Rad No.
60875467

Research History 4

  • 2023/07 - Present
    Tohoku University　Graduate School of Environmental Studies

  • 2020/04 - Present
    Tohoku University　Graduate School of Environmental Studies

  • 2018/04 - 2020/03
    Tohoku University　Graduate School of Environmental Studies

  • 2015/09 - 2016/07
    Amoy University　College of the Environment & Ecology

Education 2

  • Tohoku University　Graduate School of Environmental Studies

    2017/04 - 2020/03

  • Amoy University　College of Environment & Ecology

    2012/09 - 2015/06

Research Interests 4

  • 地球化学

  • water-rock reaction

  • CO2 storage

  • Hydrogen energy

Research Areas 3

  • Environmental science/Agricultural science / Environmental materials/recycling technology /

  • Natural sciences / Solid earth science /

  • Energy / Earth resource engineering, energy science /

Awards 15

  1. Best Student Poster Award

    2025/08　Silicate minerals dissolution in chelating agent-assisted CO2 storage environments

  2. Springer Nature Award

    2025/07　第4回環境化学物質合同大会　再生可能キレート剤とCO2を利用した木質バイオマス灰の環境負荷低減・資源化プロセス

  3. SETAC JAPAN AWARD

    2025/07　第4回環境化学物質合同大会　コンクリート製品製造における再生可能キレート剤を用いたCO2鉱物化プロセスの環境負荷低減効果

  4. 優秀発表賞（銅賞）

    2024/06　資源・素材学会 東北支部　生分解性キレート剤を用いたCO2地中貯留・鉱物固定促進法における鉱物の 加速溶解現象のモデル化

  5. 優秀発表賞（銀賞）

    2024/06　資源・素材学会 東北支部　生分解性キレート剤を用いたCO2地中貯留・鉱物固定促進法の粘土鉱物を 含有する玄武岩質火山性砂岩に対する有効性

  6. Outstanding Oral Presentation Award

    2024/06

  7. 令和5年度トーキン科学技術賞

    2024/01　公益財団法人トーキン科学技術振興財団

  8. Best Presentation Award

    2023/09　The 28th JFES Annual Symposium

  9. 若手ポスター発表賞

    2023/09　一般社団法人 資源・素材学会　生分解性キレート剤を利用した玄武岩層への CO2貯留・鉱物固定促進法

  10. Best Student Poster Award

    2023/08　The 17th International Symposium on Water-Rock Interaction (WRI-17)　Mineral dissolution behaviors in the presence of potential natural chelating agents and their contribution to CO2 removal

  11. 東北大学プロミネントリサーチフェロー

    2023/07　東北大学　地球化学プロセスの解明と持続可能な脱炭素技術への応用

  12. 研究発表優秀賞

    2022/09　日本鉱物科学会　鉱物溶解に及ぼす天然キレート剤の促進効果に関する基礎的実験

  13. 総長賞

    2020/03　Tohoku University

  14. 藤野先生記念奨励賞

    2018/09　Tohoku University

  15. 平成30年度資源・素材学会東北支部春季大会ポスターセッション金賞

    2018/05　資源・素材学会

Show all ︎Show 5

Papers 43

  1. Machine-learning applications for magmatic–hydrothermal systems: Quartz trace-element insights into ore deposits Peer-reviewed

    Denghui Zhu, Jiajie Wang, Tatsu Kuwatani, Noriyoshi Tsuchiya

    Applied Geochemistry　189　106431-106431　2025/09

    Publisher: Elsevier BV

    DOI： 10.1016/j.apgeochem.2025.106431 　

    ISSN： 0883-2927

  2. Unlocking geothermal potential: Activating calcite-filled veins using chelating agents to improve granitic rock permeability Peer-reviewed

    Lena Muhl, Luis Salalá, Eko Pramudyo, Jiajie Wang, Ingo Sass, Noriaki Watanabe

    Geothermics　131　103356-103356　2025/09

    Publisher: Elsevier BV

    DOI： 10.1016/j.geothermics.2025.103356 　

    ISSN： 0375-6505

  3. Biobased biodegradable chelating agents enhance coupled ex situ and in situ carbon dioxide mineralization via peridotite dissolution and wormholing Peer-reviewed

    Luis Salalá, Noriaki Watanabe, Jiajie Wang, Atsushi Okamoto

    Communications Earth & Environment　6　(1)　2025/08/21

    Publisher: Springer Science and Business Media LLC

    DOI： 10.1038/s43247-025-02687-2 　

    eISSN： 2662-4435

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    Abstract Mantle peridotite, which is also present in near-surface environments, reacts readily with CO2, and is expected to be suitable for CO2 mineralization. However, the low permeability and porosity of mantle peridotite, in addition to its volume changes during carbonation remain major obstacles to large-scale CO2 mineralization. Here we propose a coupled ex-situ and in-situ CO2 mineralization approach employing biobased and biodegradable chelating agents. This involves the injection of an acidic chelating agent to enhance the permeability and porosity, along with divalent metal ion extraction to achieve ex-situ CO2 mineralization on the surface (stage 1). Subsequently, an alkaline chelating agent is employed for CO2 capture, injection, and enhanced in-situ mineralization (stage 2). This study experimentally demonstrated a substantial permeability enhancement and Mg-Fe cation extraction by chelating agents, a crucial process of stage 1. The injection of acidic chelating agents leads to the formation of prominent wormholes, resulting in a 21-fold increase in permeability within ~20 minutes, indicating the potential to enhance the injectivity and CO2 mineralization capacity of peridotite.

  4. Synergized Effects of Amino Acids and NaCl to Enhance Silicate Mineral Dissolution in Aqueous Environments for Efficient Atmospheric CO2 Removal Peer-reviewed

    Jiajie Wang, Sena Kikuchi, Noriyoshi Tsuchiya, Yoshinori Sato, Mei-Fang Chien, Noriaki Watanabe

    Environmental Science & Technology　2024/12/02

    Publisher: American Chemical Society (ACS)

    DOI： 10.1021/acs.est.4c07526 　

    ISSN： 0013-936X

    eISSN： 1520-5851

  5. Applicability of monitoring data of Hg soil-atmosphere transport in an old mining area for exposure risk assessment

    Monami Kondo, Jiajie Wang, Takeshi Komai, Noriaki Watanabe

    Geochemistry: Exploration, Environment, Analysis　2024/11/19

    Publisher: Geological Society of London

    DOI： 10.1144/geochem2024-012 　

    ISSN： 1467-7873

    eISSN： 2041-4943

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    Mercury (Hg) is a widespread pollutant that poses significant risks to both ecosystems and human health. While previous studies have evaluated Hg concentrations in soils, few have measured Hg emissions in areas with high Hg concentrations or related these measurements to estimates of exposure via air inhalation based on Hg flux values. This study addresses this gap by proposing the use of gaseous elemental Hg (GEM) flux measurements for exposure risk assessments, with a particular focus on the importance of inhalation exposure, which has implications for future risk management strategies. Sensitivity analysis of the site-specific exposure and risk estimation model revealed that the fraction of land area in surface water significantly impacted the estimated exposure through air inhalation. Additionally, the analysis showed that the GEM flux measured in situ in a high-Hg concentration area of Itomuka was not directly proportional to the Hg concentration, although the risk estimation model treated it as a function of concentration. Furthermore, we found that the flux values are influenced by both the fraction of land area in surface water and Hg concentration, indicating that this new flux-based indicator should be integrated into exposure risk assessments.

  6. CO2 capture, geological storage, and mineralization using biobased biodegradable chelating agents and seawater Peer-reviewed

    Jiajie Wang, Ryota Sekiai, Ryota Tamura, Noriaki Watanabe

    Science Advances　10　(46)　2024/11

    DOI： 10.1126/sciadv.adq0515 　

  7. Characteristics and effectiveness of water-assisted CO2 fracturing for creating geothermal reservoirs in volcanic rocks

    Eko Pramudyo, Kohei Takuma, Yuto Watanabe, Kiyotoshi Sakaguchi, Yutaro Maeda, Sho Ogata, Kazumasa Sueyoshi, Jiajie Wang, Kazumi Osato, Amane Terai, Noriaki Watanabe

    Geoenergy Science and Engineering　213280-213280　2024/09

    Publisher: Elsevier BV

    DOI： 10.1016/j.geoen.2024.213280 　

    ISSN： 2949-8910

  8. CO2 fracturing of volcanic rocks under geothermal conditions: Characteristics and process

    Kohei Takuma, Yutaro Maeda, Yuto Watanabe, Sho Ogata, Kiyotoshi Sakaguchi, Eko Pramudyo, Daisuke Fukuda, Jiajie Wang, Kazumi Osato, Amane Terai, Noriaki Watanabe

    Geothermics　120　103007-103007　2024/06

    Publisher: Elsevier BV

    DOI： 10.1016/j.geothermics.2024.103007 　

    ISSN： 0375-6505

  9. Maximizing permeability of fractured volcanic rocks through chelating-agent-assisted and pH-controlled selective mineral dissolution

    Luis Salalá, Jonathan Argueta, Jiajie Wang, Noriaki Watanabe, Noriyoshi Tsuchiya

    Geothermics　119　102949-102949　2024/05

    Publisher: Elsevier BV

    DOI： 10.1016/j.geothermics.2024.102949 　

    ISSN： 0375-6505

  10. A sustainable temperature-swing process for CO2 capture and mineralization at below 100 °C using a recyclable chelating agent and bottom ash

    Jiajie Wang, Yusuke Maeda, Vani Novita Alviani, Shoichi Kumon, Kimitaka Sato, Noriyoshi Tsuchiya, Noriaki Watanabe

    Journal of Environmental Chemical Engineering　12　(2)　112301-112301　2024/04

    Publisher: Elsevier BV

    DOI： 10.1016/j.jece.2024.112301 　

    ISSN： 2213-3437

  11. Permeability enhancement by CO2 injection and chelating agent stimulation for creating geothermal reservoirs in granite Peer-reviewed

    Eko Pramudyo, Luis Salalá, Ryota Goto, Jiajie Wang, Kazumasa Sueyoshi, Lena Muhl, Kiyotoshi Sakaguchi, Noriaki Watanabe

    Geoenergy Science and Engineering　234　212586-212586　2024/03

    Publisher: Elsevier BV

    DOI： 10.1016/j.geoen.2023.212586 　

    ISSN： 2949-8910

  12. Characteristics of congruent dissolution of silicate minerals enhanced by chelating ligand under ambient conditions Peer-reviewed

    Jiajie Wang, Astin Nurdiana, Yoshinori Sato, Noriaki Watanabe, Noriyoshi Tsuchiya

    American Mineralogist　2024/02/01

    Publisher: Mineralogical Society of America

    DOI： 10.2138/am-2023-9025 　

    ISSN： 0003-004X

    eISSN： 1945-3027

  13. Reactivity and Dissolution Characteristics of Naturally Altered Basalt in CO2-Rich Brine: Implications for CO2 Mineralization Peer-reviewed

    Jiajie Wang, Masahiko Yagi, Tetsuya Tamagawa, Hitomi Hirano, Noriaki Watanabe

    ACS Omega　2024/01/17

    Publisher: American Chemical Society (ACS)

    DOI： 10.1021/acsomega.3c06899 　

    ISSN： 2470-1343

    eISSN： 2470-1343

  14. Progressive carbonation and Ca-metasomatism of serpentinized ultramafic rocks: insights from natural occurrences and hydrothermal experiments International-journal Peer-reviewed

    Nomuulin Amarbayar, Otgonbayar Dandar, Jiajie Wang, Atsushi Okamoto, Masaoki Uno, Undarmaa Batsaikhan, Hideko Takayanagi, Yasufumi Iryu, Noriyoshi Tsuchiya

    Contributions to Mineralogy and Petrology　178　2023/06

    Publisher: SpringerNature

    DOI： 10.1007/s00410-023-02013-z 　

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    Hydration, carbonation, and related metasomatism of mantle peridotite play a significant role in the global geochemical cycle. In this study, we combined an analysis of carbonated serpentinite with hydrothermal experiments on carbonation and Ca-metasomatism for samples from the Manlay ophiolite, southern Mongolia to investigate that carbonation mechanism of the serpentinite body after serpentinization. Samples show that the serpentinite was either transected by calcite and dolomite veins or was completely replaced by carbonates (calcite with minor dolomite) and quartz, in which the original mesh texture of serpentinite was preserved. Carbonation occurred after low-temperature serpentinization (lizardite/chrysotile), suggesting that carbonation occurred at temperatures lower than 300 ˚C. Calcite in the serpentinite showed δ13 CVPDB values ranging from -8.83 to -5.11 ‰ and δ18 OVSMOW from + 20.1 to + 24.4 ‰, suggesting that CO2 in the fluids could be derived from the degradation of organic material or methanotrophic processes rather than the origin of seafloor limestone. Three batch-type experiments, i.e., single step experiments (1) Olivine + NaHCO3,aq + CaCl2,aq and (2) Chrysotile + NaHCO3,aq + wollastonite (Ca source), and two steps experiment (3) Olivine carbonation and Ca-metasomatism, were conducted at 275 °C and 5.7 MPa to constrain the mechanism of calcite replacement of serpentinite. We found that calcite precipitated from the solution directly in the first two experiments, but replacement of serpentinite by calcite was not observed. In contrast, the third experiment caused the initial carbonation to form magnesite and then changed to calcite by later alteration. The natural occurrences and experiments revealed the possibility that the carbonation of olivine followed by Ca-rich fluid infiltration produced calcite in the carbonated serpentinite. Such Ca-metasomatism of Mg carbonates could easily occur in the ultramafic bodies and significantly affect the global carbon cycle.

  15. Process and optimum pH for permeability enhancement of fractured granite through selective mineral dissolution by chelating agent flooding Peer-reviewed

    Ryota Takahashi, Jiajie Wang, Noriaki Watanabe

    Geothermics　109　102646-102646　2023/03

    Publisher: Elsevier BV

    DOI： 10.1016/j.geothermics.2022.102646 　

    ISSN： 0375-6505

  16. Prediction of 1,4-Dioxane Migration in Groundwater and Evaluation of Remediation Measures in an Illegal Dumping Site Using a 2D-Numerical Model

    Thatthep Pongritsakda, Yasuhide Sakamoto, Jiajie Wang, Yoshishige Kawabe, Sanya Sirivithayapakorn, Takeshi Komai, Noriaki Watanabe

    Sustainability　15　(5)　3930-3930　2023/02/21

    Publisher: MDPI AG

    DOI： 10.3390/su15053930 　

    eISSN： 2071-1050

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    Illegal dumping sites are usually characterized by complex contamination situations due to the presence of multiple contamination sources. To improve the efficiency of illegal waste dumping site remediation, this study developed a numerical model considering the effects of groundwater levels and hydraulic gradient changes on remediation operations. Using this model, the most likely sources of contamination for 1,4-dioxane at an illegal waste site in Iwate Prefecture, Japan, were successfully identified (including location, amount, and time of occurrence) by reproducing historical monitoring data (from 2010 to 2022) through history matching, and future contaminant migration in groundwater was predicted. In addition, based on quantitative evaluations of the remediation measures, we found that some remediation measures, such as impermeable wall construction, while having some effects on the control of contamination spreading, may accelerate the migration of contaminants off-site due to the change of hydraulic gradient. Therefore, remediation procedures should be more carefully considered for illegal dumping sites based on an understanding of the distribution of contamination sources and hydraulic gradient evolutions.

  17. NaHCO3 as a carrier of CO2 and its enhancement effect on mineralization during hydrothermal alteration of basalt

    Sena Kikuchi, Jiajie Wang, Otgonbayar Dandar, Masaoki Uno, Noriaki Watanabe, Nobuo Hirano, Noriyoshi Tsuchiya

    Frontiers in Environmental Science　11　2023/02/15

    Publisher: Frontiers Media SA

    DOI： 10.3389/fenvs.2023.1138007 　

    eISSN： 2296-665X

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    Reaction of carbon dioxide (CO2) with minerals to generate stable carbonates, also known as CO2 mineralization, has been regarded as one of the most promising methods for safe and permanent carbon storage. As a promising feedstock, basaltic rock has gained special interest, and elevating basalt carbonation efficiency with the reduction of negative environmental impact is the main challenge for CO2 mineralization system development. Considering multiple potential positive effects of the CO2 carrier, NaHCO3, we conducted this study to experimentally evaluate the CO2 storage efficiency during water-basalt-NaHCO3 interactions under hydrothermal conditions at 200–300°C. The inclusion of NaHCO3 was confirmed to drastically promote the alteration of basalt, especially at higher temperatures. As revealed by experiments conducted at the saturated vapor pressure of water, the carbon storage efficiency at 300°C reached 75 g/kg of basalt in 5 days, which was 12 times higher than that at 200°C. In such hydrothermal systems, basalt was carbonated to generate calcite (CaCO3), where the Ca was mainly from plagioclase; Mg and Fe were incorporated into smectite, and Na in the saline system participated in the formation of Na silicates (i.e., analcime in the case of basalt). Due to the presence of additional Na in solution, all the released elements were consumed quickly with generation of secondary minerals in turn promoted basalt dissolution to release more Ca for CO2 storage. This study illuminated the role of NaHCO3 in basalt carbonation and provided technical backup to the design of advanced CO2 mineralization systems.

  18. Permeability enhancement and void formation by chelating agent in volcanic rocks (Ahuachapán and Berlín geothermal fields, El Salvador) International-journal International-coauthorship Peer-reviewed

    Luis Salalá, Ryota Takahashi, Jonathan Argueta, Jiajie Wang, Noriaki Watanabe, Noriyoshi Tsuchiya

    Geothermics　107　102586-102586　2023/01

    Publisher: Elsevier BV

    DOI： 10.1016/j.geothermics.2022.102586 　

    ISSN： 0375-6505

  19. Effectiveness and characteristics of atmospheric CO2 removal in croplands via enhanced weathering of industrial Ca-rich silicate byproducts Peer-reviewed

    Rina Yoshioka, Kengo Nakamura, Ryota Sekiai, Jiajie Wang, Noriaki Watanabe

    Frontiers in Environmental Science　10　1068656　2022/11/25

    Publisher: Frontiers Media SA

    DOI： 10.3389/fenvs.2022.1068656 　

    eISSN： 2296-665X

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    Enhanced weathering of industrial Ca-rich silicate byproducts in croplands is potentially profitable for large-scale atmospheric CO2 removal; during the weathering process, CO2 dissolves to form HCO3− and CO32− in alkaline soil pore water, which eventually flows into the ocean. However, the effectiveness of such systems is still in doubt, owing to the unrealistic models used for prediction and the insufficient consideration of the dynamic influences of soils on fluid chemistry. We determined the effectiveness of such systems for atmospheric CO2 removal, along with their characteristics, through a set of batch- and flow-through-type laboratory experiments, using andosol and decomposed granite soil as agricultural and non-agricultural soils, respectively, and Portland cement, steelmaking slag, and coal fly ash as industrial byproducts. The results of the batch-type experiments demonstrated that agricultural soils were suitable for CO2 removal, owing to their moderately high pH and Ca concentrations in pore water that prevented intensive calcium carbonate precipitation. The flow-through experiments demonstrated that a higher Ca-content byproduct can have a large atmospheric CO2 removal capacity. However, the magnitude of CO2 removal and its time-dependent behavior were difficult to predict because they were not in conjunction with the changes in the average pH value. This indicated that the diffusive transport of CO2 from the atmosphere-soil interface to deeper soils was more complex than expected. Maximizing CO2 removal requires a better understanding of the diffusive transport of CO2 through gas-filled pore spaces, created by unsteady-state air–water two-phase flow, due to intermittent rainfall.

  20. Potentially toxic elements pose significant and long-term human health risks in river basin districts with abandoned gold mines Peer-reviewed

    Arie Pujiwati, Kengo Nakamura, Jiajie Wang, Yoshishige Kawabe, Noriaki Watanabe, Takeshi Komai

    Environmental Geochemistry and Health　44　(2)　Article 00149R2　2022/03/08

    Publisher: Springer Science and Business Media LLC

    DOI： 10.1007/s10653-022-01229-5 　

    ISSN： 0269-4042

    eISSN： 1573-2983

  21. Role of water in unexpectedly large changes in emission flux of volatile organic compounds in soils under dynamic temperature conditions Peer-reviewed

    Asma Akter Parlin, Monami Kondo, Noriaki Watanabe, Kengo Nakamura, Jiajie Wang, Yasuhide Sakamoto, Takeshi Komai

    Scientific Reports　12　(1)　4418　2022/03

    Publisher: Springer Science and Business Media LLC

    DOI： 10.1038/s41598-022-08270-5 　

    eISSN： 2045-2322

  22. A geochemical approach for source apportionment and environmental impact assessment of heavy metals in a Cu–Ni mining region, Botswana Peer-reviewed

    Fiona Motswaiso, Jiajie Wang, Kengo Nakamura, Noriaki Watanabe, Takeshi Komai

    Environmental Earth Sciences　81　(5)　Article 138　2022/03

    Publisher: Springer Science and Business Media LLC

    DOI： 10.1007/s12665-021-10158-y 　

    ISSN： 1866-6280

    eISSN： 1866-6299

  23. Sustainable process for enhanced CO2 mineralization of calcium silicates using a recyclable chelating agent under alkaline conditions Peer-reviewed

    Jiajie Wang, Noriaki Watanabe, Kosuke Inomoto, Masanobu Kamitakahara, Kengo Nakamura, Takeshi Komai, Noriyoshi Tsuchiya

    Journal of Environmental Chemical Engineering　10　(1)　107055-107055　2022/02

    Publisher: Elsevier BV

    DOI： 10.1016/j.jece.2021.107055 　

    ISSN： 2213-3437

  24. Multi-stage serpentinization of ultramafic rocks in the Manlay Ophiolite, southern Mongolia Peer-reviewed

    Amarbayar Nomuulin, Noriyoshi Tsuchiya, Otgonbayar Dandar, Atsushi Okamoto, Masaoki Uno, Undarmaa Batsaikhan, Jiajie Wang

    Mongolian Geoscientist　26　(53)　1-17　2021/12/30

    Publisher: Mongolian Journals Online

    DOI： 10.5564/mgs.v26i53.1787 　

    ISSN： 2220-0622

    eISSN： 2663-5151

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    Serpentinization of ultramafic rocks in ophiolites is key to understanding the global cycle of elements and changes in the physical properties of lithospheric mantle. Mongolia, a central part of the Central Asian Orogenic Belt (CAOB), contains numerous ophiolite complexes, but the metamorphism of ultramafic rocks in these ophiolites has been little studied. Here we present the results of our study of the serpentinization of an ultramafic body in the Manlay Ophiolite, southern Mongolia. The ultramafic rocks were completely serpentinized, and no relics of olivine or orthopyroxene were found. The composition of Cr-spinels [Mg# = Mg/(Mg + Fe2+) = 0.54 and Cr# = Cr/(Cr + Al) = 0.56] and the bulk rock chemistry (Mg/Si = 1.21–1.24 and Al/Si < 0.018) of the serpentinites indicate their origin from a fore-arc setting. Lizardite occurs in the cores and rims of mesh texture (Mg# = 0.97) and chrysotile is found in various occurrences, including in bastite (Mg# = 0.95), mesh cores (Mg# = 0.92), mesh rims (Mg# = 0.96), and later-stage large veins (Mg# = 0.94). The presence of lizardite and chrysotile and the absence of antigorite suggests low-temperature serpentinization (<300 °C). The lack of brucite in the serpentinites implies infiltration of the ultramafic rocks of the Manlay Ophiolite by Si-rich fluids. Based on microtextures and mineral chemistry, the serpentinization of the ultramafic rocks in the Manlay Ophiolite took place in three stages: (1) replacement of olivine by lizardite, (2) chrysotile formation (bastite) after orthopyroxene and as a replacement of relics of olivine, and (3) the development of veins of chrysotile that cut across all previous textures. The complex texture of the serpentinites in the Manlay Ophiolite indicates multiple stages of fluid infiltration into the ultramafic parts of these ophiolites in southern Mongolia and the CAOB.

  25. Prediction and Remediation of Groundwater Pollution in a Dynamic and Complex Hydrologic Environment of an Illegal Waste Dumping Site

    Thatthep Pongritsakda, Kengo Nakamura, Jiajie Wang, Noriaki Watanabe, Takeshi Komai

    Applied Sciences　11　(19)　9229-9229　2021/10/04

    Publisher: MDPI AG

    DOI： 10.3390/app11199229 　

    eISSN： 2076-3417

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    The characteristics of groundwater pollution caused by illegal waste dumping and methods for predicting and remediating it are still poorly understood. Serious 1,4-dioxane groundwater pollution—which has multiple sources—has been occurring at an illegal waste dumping site in the Tohoku region of Japan. So far, anti-pollution countermeasures have been taken including the installation of an impermeable wall and the excavation of soils and waste as well as the monitoring of contamination concentrations. The objective of this numerical study was to clarify the possibility of predicting pollutant transport in such dynamic and complex hydrologic environments, and to investigate the characteristics of pollutant transport under both naturally occurring and artificially induced groundwater flow (i.e., pumping for remediation). We first tried to reproduce the changes in 1,4-dioxane concentrations in groundwater observed in monitoring wells using a quasi-3D flow and transport simulation considering the multiple sources and spatiotemporal changes in hydrologic conditions. Consequently, we were able to reproduce the long-term trends of concentration changes in each monitoring well. With the predicted pollutant distribution, we conducted simulations for remediation such as pollutant removal using pumping wells. The results of the prediction and remediation simulations revealed the highly complex nature of 1,4-dioxane transport in the dumping site under both naturally occurring and artificially induced groundwater flows. The present study suggests possibilities for the prediction and remediation of pollution at illegal waste dumping sites, but further extensive studies are encouraged for better prediction and remediation.

  26. Dynamic evaluation method for planning sustainable landfills using GIS and multi-criteria in areas of urban sprawl with land-use conflicts

    Chelsea Langa, Junko Hara, Jiajie Wang, Kengo Nakamura, Noriaki Watanabe, Takeshi Komai

    PLOS ONE　16　(8)　e0254441-e0254441　2021/08/27

    Publisher: Public Library of Science (PLoS)

    DOI： 10.1371/journal.pone.0254441 　

    eISSN： 1932-6203

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    Landfill site selection is problematic in many countries, especially developing nations where there is rapid population growth, which leads to high levels of inadequate waste disposal. To find sustainable landfill sites in sprawling cities, this study presents an approach that combines geographic information system (GIS) with multi-criteria (social, environmental and, technical criteria) and the population growth projection. The greater Maputo area in Mozambique was selected as a representative city for the study, which is undergoing rapid urbanization. Six criteria, i.e., land use, transport networks, hydrology, conservation reserve, geology and slope, were considered and overlaid in the GIS using an analytic hierarchy process (AHP). The arithmetic projection of the population trend suggests that the greater Maputo area is experiencing a rapid and uncontrolled population growth, especially in Matola city. These pronounced changes in population then significantly change the landfill placement decision making. Dynamic and static scenarios were created, based on the analysis of multi-criteria and the areas likely to undergo future increased population growth. A comparative evaluation in a scenario of dynamic behavior considering future population showed that suitable areas for landfill sites have been drastically modified due to social and environmental factors affected by population distribution in some regions. The results indicate that some suitable areas can generate land use conflicts due to population growth with unplanned land use expansion. Finally, the western part of Matola city is recognized as the most recommendable landfill site, which can serve both Maputo and Matola city with affordable costs. This study provides an effective landfill placement decision making approach, which is possible to be applied anywhere, especially in developing countries to improve sustainable municipal solid waste management systems.

  27. Enhancement of aragonite mineralization with a chelating agent for CO2 storage and utilization at low to moderate temperatures Peer-reviewed

    Jiajie Wang, Noriaki Watanabe, Kosuke Inomoto, Masanobu Kamitakahara, Kengo Nakamura, Takeshi Komai, Noriyoshi Tsuchiya

    Scientific Reports　11　13956　2021/07

    Publisher: Springer Science and Business Media LLC

    DOI： 10.1038/s41598-021-93550-9 　

    eISSN： 2045-2322

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    <title>Abstract</title>Among the CaCO3 polymorphs, aragonite demonstrates a better performance as a filler material in the paper and plastic industries. Despite being ideal from the environmental protection perspective, the production of aragonite particles via CO2 mineralization of rocks is hindered by the difficulty in achieving high production efficiencies and purities, which, however, can be mitigated by exploiting the potential ability of chelating agents on metal ions extraction and carbonation controlling. Herein, chelating agent <italic>N,N</italic>-dicarboxymethyl glutamic acid (GLDA) was used to enhance the extraction of Ca from calcium silicate and facilitate the production of aragonite particles during the subsequent Ca carbonation. CO2 mineralization was promoted in the presence of 0.01–0.1 M GLDA at ≤ 80 °C, with the maximal CaCO3 production efficiency reached 308 g/kg of calcium silicate in 60 min using 0.03 M GLDA, which is 15.5 times higher than that without GLDA. In addition, GLDA showed excellent effects on promoting aragonite precipitation, e.g., the content of aragonite was only 5.1% in the absence of GLDA at 50 °C, whereas highly pure (&gt; 90%, increased by a factor of 18) and morphologically uniform aragonite was obtained using ≥ 0.05 M GLDA under identical conditions. Aragonite particle morphologies could also be controlled by varying the GLDA concentration and carbonation temperature. This study proposed a carbon-negative aragonite production method, demonstrated the possibility of enhanced and controlled aragonite particle production during the CO2 mineralization of calcium silicates in the presence of chelating agents.

  28. Water-Enhanced Flux Changes under Dynamic Temperatures in the Vertical Vapor-Phase Diffusive Transport of Volatile Organic Compounds in Near-Surface Soil Environments

    Asma Akter Parlin, Monami Kondo, Noriaki Watanabe, Kengo Nakamura, Mizuki Yamada, Jiajie Wang, Takeshi Komai

    Sustainability　13　(12)　6570-6570　2021/06/09

    Publisher: MDPI AG

    DOI： 10.3390/su13126570 　

    eISSN： 2071-1050

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    The quantitative understanding of the transport behavior of volatile organic compounds (VOCs) in near-surface soils is highly important in light of the potential impacts of soil VOC emissions on the air quality and climate. Previous studies have suggested that temperature changes affect the transport behavior; however, the effects are not well understood. Indeed, much larger changes in the VOC flux under in situ dynamic temperatures than those expected from the temperature dependence of the diffusion coefficients of VOCs in the air have been suggested but rarely investigated experimentally. Here, we present the results of a set of experiments on the upward vertical vapor-phase diffusive transport of benzene and trichloroethylene (TCE) in sandy soils with water contents ranging from an air-dried value to 10 wt% during sinusoidal temperature variation between 20 and 30 °C. In all experiments, the flux from the soil surface was correlated with the temperature, as expected. However, the changes in flux under wet conditions were unexpectedly large and increased with increasing water content; they were also larger for TCE, the volatility of which depended more strongly on the temperature. Additionally, the larger flux changes were accompanied by a recently discovered water-induced inverse correlation between temperature and flux into the overlying soil. These results demonstrated that the flux changes of VOCs under dynamic temperatures could be increased by volatilization-dissolution interactions of VOCs with water. Future extensive studies on this newly discovered phenomenon would contribute to a better understanding of the impacts of soil VOC emissions on the air quality and climate.

  29. Water-Induced Inverse Correlation between Temperature and Flux Changes in Vertical Vapor-Phase Diffusive Transport of Volatile Organic Compounds in Near-Surface Soil Environments

    Asma Akter Parlin, Noriaki Watanabe, Kengo Nakamura, Mizuki Yamada, Jiajie Wang, Takeshi Komai

    Applied Sciences　11　(8)　3489-3489　2021/04/13

    Publisher: MDPI AG

    DOI： 10.3390/app11083489 　

    eISSN： 2076-3417

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    Volatile organic compounds (VOCs) in contaminated soils have been investigated in near-surface environments to describe their transport behaviors and the resultant impacts of vapor intrusion into buildings. Prior studies have suggested that temperature changes significantly influence such transport behaviors in near-surface soils; however, the nature of these influences and their mechanisms have remained unclear. This is because an inverse correlation between the in situ temperature and VOC flux changes has been suggested but has not been experimentally investigated or demonstrated. Herein, we show the results of a set of experiments on the vertical and upward vapor-phase diffusive transport of benzene in sandy soils for different sand grain size and water content combinations under sinusoidal temperature changes between 20 and 30 °C. Under all experimental conditions, changes in the flux from the soil surface correlated with temperature changes, whereas changes in the flux into the overlying soil showed inverse correlations. Concurrent monitoring of the relative humidity revealed that an inverse correlation was exhibited in response to the condensation and volatilization of water. Moreover, the intensity of the inverse correlation was independent of grain size but was larger at higher water contents. Overall, water in soil may induce an inverse correlation.

  30. Data-driven analysis for source apportionment and geochemical backgrounds establishment of toxic elements and REEs in the Tohoku region, Japan Peer-reviewed

    Arie Pujiwati, Jiajie Wang, Kengo Nakamura, Yoshishige Kawabe, Noriaki Watanabe, Takeshi Komai

    Chemosphere　263　128268-128268　2021/01

    Publisher: Elsevier BV

    DOI： 10.1016/j.chemosphere.2020.128268 　

    ISSN： 0045-6535

  31. Characteristics of hydrogen production with carbon storage by CO2-rich hydrothermal alteration of olivine in the presence of Mg–Al spinel Peer-reviewed

    Jiajie Wang, Noriaki Watanabe, Atsushi Okamoto, Kengo Nakamura, Takeshi Komai

    International Journal of Hydrogen Energy　2020/03

  32. Pyroxene control of H-2 production and carbon storage during water-peridotite-CO2 hydrothermal reactions Peer-reviewed

    Jiajie Wang, Noriaki Watanabe, Atsushi Okamoto, Kengo Nakamura, Takeshi Komai

    INTERNATIONAL JOURNAL OF HYDROGEN ENERGY　44　(49)　26835-26847　2019/10

    DOI： 10.1016/j.ijhydene.2019.08.161 　

    ISSN： 0360-3199

    eISSN： 1879-3487

  33. NaHCO<inf>3</inf>-promoted olivine weathering with H<inf>2</inf> generation and CO<inf>2</inf> sequestration in alkaline hydrothermal system Peer-reviewed

    J. Wang, K. Nakamura, N. Watanabe, A. Okamoto, T. Komai

    IOP Conference Series: Earth and Environmental Science　257　(1)　2019/05/10

    DOI： 10.1088/1755-1315/257/1/012017 　

    ISSN： 1755-1307

    eISSN： 1755-1315

  34. Acceleration of hydrogen production during water-olivine-CO2 reactions via high-temperature-facilitated Fe(II) release Peer-reviewed

    Jiajie Wang, Noriaki Watanabe, Atsushi Okamoto, Kengo Nakamura, Takeshi Komai

    INTERNATIONAL JOURNAL OF HYDROGEN ENERGY　44　(23)　11514-11524　2019/05

    DOI： 10.1016/j.ijhydene.2019.03.119 　

    ISSN： 0360-3199

    eISSN： 1879-3487

  35. Enhanced hydrogen production with carbon storage by olivine alteration in CO2-rich hydrothermal environments Peer-reviewed

    Jiajie Wang, Noriaki Watanabe, Atsushi Okamoto, Kengo Nakamura, Takeshi Komai

    JOURNAL OF CO2 UTILIZATION　30　205-213　2019/03

    DOI： 10.1016/j.jcou.2019.02.008 　

    ISSN： 2212-9820

    eISSN： 2212-9839

  36. Simultaneous H2 Production with Carbon Storage by Enhanced Olivine Weathering in Laboratory-scale: An Investigation of CO2 Effect Peer-reviewed

    Jiajie Wang, Kengo Nakamura, Noriaki Watanabe, Atsushi Okamoto,Takeshi Komai

    The Second International Conference on Materials Chemistry and Environmental Protection　2019/01

  37. Simultaneous Olivine Alteration and Carbonation in CO2-rich Geological Condition Peer-reviewed

    Jiajie Wang, Kengo Nakamura, Noriaki Watanabe, Takeshi Komai

    Twenty-eighth International Ocean and Polar Engineering Conference (ISOPE)　2018-June　244-250　2018/06

    ISSN： 1098-6189

    eISSN： 1555-1792

  38. Rapid synthesis of colloidal silver triangular nanoprisms and their promotion of TiO2 photocatalysis on methylene blue under visible light Peer-reviewed

    Ang Yu, Qijun Wang, Jiajie Wang, Chang-tang Chang

    CATALYSIS COMMUNICATIONS　90　75-78　2017/02

    Publisher: ELSEVIER SCIENCE BV

    DOI： 10.1016/j.catcom.2016.11.004 　

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    This study synthesizes colloidal silver triangular nanoprisms via dual-reduction method. The particle morphology is controlled by changing the silver nitrate and polyvinylpyrrolidone concentrations. The triangular silver and spherical silver colloids are combined with TiO2 powder for methylene blue (MB) photodegradation in visible light. Comparisons between the spherical Ag (S-Ag) and experimental results show that the triangular silver (T-Ag) significantly promotes MB degradation under visible light, which contributes to the surface plasmon resonance effect on the Ag triangular nanoprisms. (C) 2016 Elsevier B.V. All rights reserved.

  39. Synthesized TiO2/ZSM-5 composites used for the photocatalytic degradation of azo dye: Intermediates, reaction pathway, mechanism and bio-toxicity Peer-reviewed

    Kefu Zhou, Xin-Yan Hu, Bor-Yann Chen, Chung-Chuan Hsueh, Qian Zhang, Jiajie Wang, Yu-Jung Lin, Chang-Tang Chang

    APPLIED SURFACE SCIENCE　383　300-309　2016/10

    DOI： 10.1016/j.apsusc.2016.04.155 　

    ISSN： 0169-4332

    eISSN： 1873-5584

  40. Preparation of 13X from Waste Quartz and Photocatalytic Reaction of Methyl Orange on TiO2/ZSM-5, 13X and Y-Zeolite Peer-reviewed

    Jia-Jie Wang, You-Hai Jing, Tong Ouyang, Chang-Tang Chang

    JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY　15　(8)　6141-6149　2015/08

    DOI： 10.1166/jnn.2015.10202 　

    ISSN： 1533-4880

    eISSN： 1533-4899

  41. Photocatalytic degradation of acetaminophen in aqueous solutions by TiO2/ZSM-5 zeolite with low energy irradiation Peer-reviewed

    Chang-Tang Chang, Jia-Jie Wang, Tong Ouyang, Qian Zhang, You-Hai Jing

    MATERIALS SCIENCE AND ENGINEERING B-ADVANCED FUNCTIONAL SOLID-STATE MATERIALS　196　53-60　2015/06

    DOI： 10.1016/j.mseb.2014.12.025 　

    ISSN： 0921-5107

    eISSN： 1873-4944

  42. Photoreduction of carbon dioxide by graphene-titania and zeolite-titania composites under low-intensity irradiation Peer-reviewed

    Qian Zhang, Jia Jie Wang, Cheng-Fang Lin, You Hai Jing, Chang-Tang Chang

    MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING　30　162-168　2015/02

    DOI： 10.1016/j.mssp.2014.09.049 　

    ISSN： 1369-8001

    eISSN： 1873-4081

  43. Photocatalytic reduction of CO2 to energy products using Cu-TiO2/ZSM-5 and Co-TiO2/ZSM-5 under low energy irradiation Peer-reviewed

    Jia-Jie Wang, You-Hai Jing, Tong Ouyang, Qian Zhang, Chang-Tang Chang

    CATALYSIS COMMUNICATIONS　59　69-72　2015/01

    DOI： 10.1016/j.catcom.2014.09.030 　

    ISSN： 1566-7367

    eISSN： 1873-3905

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Industrial Property Rights 6

  1. 岩石中の金属成分溶解方法、地中への二酸化炭素貯留方法、および二酸化炭素固定方法

    渡邉則昭, WANG JIAJIE, 岡本敦, 堰合涼太

    特許7726549

    Property Type: Patent

  2. 二酸化炭素固定方法及び二酸化炭素固定装置

    渡邉則昭, Wang Jiajie, 佐藤王高, 公文翔一

    Property Type: Patent

  3. 二酸化炭素固定方法、二酸化炭素回収方法、並びに二酸化炭素固定装置及 びこれを備えた環境配慮型産業設備

    渡邉則昭, Wang Jiajie

    Property Type: Patent

  4. 岩石中の成分の溶解方法、地中への二酸化炭素の貯留方法、二酸化炭素の 固定方法、地中への流体の貯留方法、原油の回収方法、及び、天然ガスの回収方法

    渡邉 則昭, Wang Jiajie, 田村 諒太, 平野 ひとみ, 玉川 哲也

    Property Type: Patent

  5. 金属成分及び陰イオン成分の回収方法

    渡邉則昭, Wang Jiajie

    Property Type: Patent

  6. 二酸化炭素固定方法，二酸化炭素の回収方法，二酸化炭素固定装置，および環境配慮型産業設備

    渡邉則昭, WANG JIAJIE, 土屋範芳

    特許7345791

    Property Type: Patent

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Research Projects 8

  1. Enhanced CO2 geological storage and mineralization in basalt using biodegradable chelating agents

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research

    Category: Grant-in-Aid for Scientific Research (B)

    Institution: Tohoku University

    2024/04 - 2029/03

  2. Innovative Resource Recycling Use of Woody Biomass Ash and Nutrient Dynamics Analysis: New Developments for Sustainable Agriculture

    Offer Organization: Bio-oriented Technology Research Advancement Institution (BRAIN)

    2024/09 - 2027/03

  3. Development of arsenic-contaminated groundwater purification technology to secure safe water resources in the Mekong Delta

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research

    Category: Fund for the Promotion of Joint International Research (International Collaborative Research)

    Institution: Tohoku Gakuin University

    2023/09 - 2027/03

  4. A New Chemical Stimulation Method for Geothermal Reservoirs: Selective Mineral Dissolution with Environmentally Friendly Chelating Agents

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research

    Category: Grant-in-Aid for Scientific Research (B)

    Institution: Tohoku University

    2022/04 - 2027/03

  5. データ駆動型ネットワーク解析による地熱エネルギーの社会受容性評価

    土屋 範芳, 鈴木 杏奈, WANG JIAJIE, 平野 伸夫, 窪田 ひろみ, TRENCHER GREGORY

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業

    Category: 基盤研究(A)

    Institution: 東北大学

    2021/04 - 2025/03

  6. キレート剤による岩石/廃棄物からの金属抽出とCO2利用・鉱物化プロセスの開発

    WANG JIAJIE

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業

    Category: 若手研究

    Institution: 東北大学

    2021/04 - 2024/03

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    To address the remaining issues for CO2 mineralization, i.e., low carbon storage efficiency and poor economic performance, this research aims to develop a new CO2 mineralization system by using recyclable chelating agents at low to moderate temperatures. The new CO2 mineralization system has the potential merits of high efficiency and high economic performance, thus is promising to be applied widely to fight climate change. In the first year of research, the excellent role of chelating agent on promoting CO2 mineralization was confirmed. Based on clarification of the effects of various conditions on mineral dissolution and carbonation, the system was optimized. Moreover, the special role of chelating agents on controlling Ca carbonates purity and morphologies was confirmed (Wang et al., Sci. Rep., 2021), which has great significance in making valuable products for industrial application. After that, a sustainable process for enhanced CO2 mineralization using chelating agents were proposed and optimized (Wang et al., J. Environ. Chem. Eng., 2022). The technical feasibility was verified and potential challenges were proposed. Finally, the application of this system to various industrial wastes were also started and the behaviours of heavy metals and rare earth elements will also be investigated from the environmental science and resource aspects.

  7. Development of sustainable process for Ca/Mg extraction and CO2 mineralization using rocks assisted by a recyclable chelating agent.

    WANG JIAJIE

    Offer Organization: The Sumitomo Foundation

    Institution: Tohoku University

    2020/10 - 2021/11

  8. 鉱物触媒水熱反応を用いた二酸化炭素の地中資源化システム

    WANG JIAJIE

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業

    Category: 特別研究員奨励費

    Institution: 東北大学

    2018/04 - 2020/03

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    In this research year, reaction pathways and Fe behaviors during water-olivine-CO2 reactions under different reaction conditions were further summarized and published in the conferences of "17th ICCDU (Germany, 2019)" and 日本地球惑星科学連合大会(2019). The influences of the most common coexisting minerals (i.e., pyroxenes and spinel) with olivine in peridotite in natural system were clarified. The presence of orthopyroxene or Mg-Al spinel can accelerate olivine alteration in CO2-rich hydrothermal environments and change Fe(II) behaviors without significant influence on the total H2 yield in terms of long-time reaction. However, the mineralization of CO2 could not be enhanced. The role of orthopyroxene and Mg-Al spinel also changed with the reaction time. These findings suggest that using peridotite that contains pyroxenes or spinels for H2 production is also possible; in general, peridotite contains <20 wt% orthopyroxene or >10 wt% Mg-Al spinel is more suitable for H2 production than monomineralic olivine. For another, several ways for elevating H2 production (e.g., including Al sources) were also suggested. This part of research is a step forward in large-scale application of the new negative-carbon H2 production system. The results have been summarized into 2 papers published in the journal of “International Journal of Hydrogen energy (IF: 4.229)”.

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