2018 Fiscal Year Annual Research Report
太陽光を利用した水中細菌の新規光触媒処理システムの開発
| Project/Area Number |
18J20620
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| Research Institution | University of Tsukuba |
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Principal Investigator |
LIU NA 筑波大学, 生命環境科学研究科, 特別研究員(DC1)
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| Project Period (FY) |
2018-04-25 – 2021-03-31
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| Keywords | Photocatalyst / Solar-light-driven / Water disinfection / Gram-positive / Gram-negative |
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| Outline of Annual Research Achievements |
During the first fiscal year of my research, the photocatalytic inactivation ability of a novel solar-light-driven P/Ag/Ag2O/Ag3PO4/TiO2 photocatalyst on two different types of microorganisms was systematically studied both in single and mixed bacteria system. According to previous studies, the novel solar-light-driven P/Ag/Ag2O/Ag3PO4/TiO2 photocatalyst, firstly synthesized by our lab, has shown remarkable disinfection ability on Gram-negative E. coli. Considering in real water environment, Gram-negative and Gram-positive bacteria are usually coexistent, as such, it is of practical significance to investigate the photocatalytic inactivation efficiency on Gram-negative and Gram-positive bacteria, respectively, in single and mixed bacteria system.
In order to clarify the novel photocatalyst disinfection ability on different types of microorganisms, the study was carried out through the following three key points. (1) Comparison of the photocatalytic inactivation between different types microorganisms: Gram-positive and Gram-negative. (2) Evaluation of the photocatalytic disinfection performance both in single and mixed bacteria system.(3) Investigation of the bacteria damage process during the photocatalytic disinfection process.
The results showed the novel P/Ag/Ag2O/Ag3PO4/TiO2 composite could effectively inactivate both Gram-negative and Gram-positive bacterium either in single or mixed bacteria system.The present study results will help optimize engineering parameters in future application of this novel photocatalyst in large-scale wastewater disinfection system.
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| Current Status of Research Progress |
Current Status of Research Progress
2: Research has progressed on the whole more than it was originally planned.
Reason
In FY 2018, with the aim of "clarifying the photocatalytic inactivation ability of the novel solar-light-driven P/Ag/Ag2O/Ag3PO4/TiO2 photocatalyst on two different types of microorganisms",the research was conducted from three categories:(1) Comparison of the photocatalytic inactivation between different types microorganisms: Gram-positive and Gram-negative. (2) Evaluation of the photocatalytic disinfection performance both in single and mixed bacteria system. (3) Investigation of the bacteria damage process during the photocatalytic disinfection process.The present study results will help optimize engineering parameters in future application of this novel photocatalyst in large-scale wastewater disinfection system.
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| Strategy for Future Research Activity |
Based on the result obtained in the previous fiscal year, the novel P/Ag/Ag2O/Ag3PO4/TiO2 photocatalyst with remarkable disinfection ability for both Gram-negative and Gram-positive bacteria, can be very suitable for practical bacterial inactivation. Therefore, in this fiscal year, following the research plan, to further scale up the present reactor system and make full use of the solar light energy, a continuous-cycle photocatalytic disinfection system based on the Inclined Plate Collectors (IPC) photoreactor will be developed. Moreover, the optimum conditions of this solar photocatalytic disinfection system will be established, including reaction volume, flow rate and initial concentration of bacteria by using different types of bacteria. Compared to other photoreactor designs, the significantly simplified design and low material cost of this inclined plate photoreactor makes it particularly suitable for use in economically and logistically challenged areas.
Based on the above experiments, the results will be summarized and presented on conferences. Also, the research paper will be summarized and submitted to the international journal.
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[Presentation] Continuous Bio-hydrogen Production by Iron-modified Zeolite Addition in Hybrid Fixed-bed Reactor2019
Author(s)
Zhao, C. Y., Zhang, N., Zheng, H. Y., Liu, N., Sharma, A., Yang, Y. N.
Organizer
The 53rd Annual Conference of JSWE
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[Presentation] Effective Treatment of Seawater Pollutants Under Simulated Solar Light Using Modified-TiO2 Photocatalyst2019
Author(s)
Sharma, A., Liu, N., Zhang, N., Ma, Q. S., Zhao, C. Y., Yang, Y. N.
Organizer
84th SCEJ Annual Meeting
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[Presentation] Comparison of The Photocatalytic Inactivation Between Two Model Microorganisms: Gram-Positive Enterococcus Sp. and Gram-Negative E. coli2018
Author(s)
Liu, N., Zhu, Q., Zhang, N., Ma, Q. S., Negishi, N., Yang, Y. N.
Organizer
The 11th Japan-China-Korea Graduate Student Forum
Int'l Joint Research
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[Presentation] Effect of Salinity on Degradation of Organic Pollutants in Seawater Using TiO2-Based Composite Photocatalyst2018
Author(s)
Sharma, A., Zheng, H. Y., Liu, N., Zhao, C. Y., Zhang, N., Yang, Y. N.
Organizer
The 11th Japan-China-Korea Graduate Student Forum
Int'l Joint Research
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