2022 Fiscal Year Annual Research Report
Modelling reactive intermediates for predicting photodegradation of organic micropollutants in freshwater environment
| Project/Area Number |
22J12590
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| Allocation Type | Single-year Grants |
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| Research Institution | Tokyo Institute of Technology |
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Principal Investigator |
GUO ZHONGYU 東京工業大学, 環境・社会理工学院, 特別研究員(DC2)
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| Project Period (FY) |
2022-04-22 – 2024-03-31
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| Keywords | photochemistry / photolysis / reactive intermediates / dissolved organic matter / reservoir / modeling / quantum yield / simulated sunlight |
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| Outline of Annual Research Achievements |
50 reservoir samples and 7 lake and pond samples were taken across Japan from Okinawa to Hokkaido. The characterization of reservoir samples in terms of water chemistry and absorption spectra indicated that major variations in the dissolved organic matter (DOM) were molecular structures and compositions.
Quantum yield for photo-production of singlet oxygen of the reservoirs are close to river and lakes dominated by terrestrial DOM but lower than water bodies dominated by microbial DOM.Linear (single and multiple) and non-linear models (machine-learning) were developed and can be used to estimate quantum yield with a high accuracy for reservoirs.In addition, the models can be additionally used for estimating quantum yidl in lakes, ponds, and referenced DOM samples.
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| Current Status of Research Progress |
Current Status of Research Progress
1: Research has progressed more than it was originally planned.
Reason
The research is on schedule and we have submitted the second paper to a high-level journal.Now the paper is under review.
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| Strategy for Future Research Activity |
Since this reservoir only focus on reservoirs, or we can say freshwater system, it is necessary to generalize the model to a universal model that can be used also in seawater. However, in seawater, it contains salts which may influence the photo-production of reactive intermediates. Thus, future can pay attention to the effects of those salts on quantum yield for photo-production of reactive intermediates and modeify the model or develop a new model.
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[Journal Article] Photodegradation of Organic Micropollutants in Aquatic Environment: Importance, Factors and Processes.2022
Author(s)
Guo, Z.Y., Kodikara, D., Albi, L.S., Hatano, Y., Chen, G., Yoshimura, C., Wang, J.Q.
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Journal Title
Water Research
Volume: 231
Pages: 118236
DOI
Peer Reviewed / Int'l Joint Research
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