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Investigation of drinking water bacterial community through high-throughput sequencing

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Journal of Environmental Sciences 2015年第11期27卷 154-156页

作者： Tsz Wai Ng Guocheng Huang po keung wong School of Life Sciences The Chinese University of Hong Kong

Delivery of safe and pathogen-free drinking water is crucial to public ***,there exist challenges to the maintenance of the sterility of drinking water throughout the drinking water distribution systems（DWDS）.Microbial growth in DWDS,such as growth of opportunistic pathogenic microorganisms,can lead to severe health problems in consumers（Berry et al.,2006;Brettar and Hofle,2006;Lu et al.,2014;Zhang et al.,2015）.

关键词： Drinking water distribution systems Microbial community High-throughput sequencing Water safety

Photoelectrochemical degradation of Methylene Blue with β-PbO_2 electrodes driven by visible light irradiation

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Journal of Environmental Sciences 2011年第6期23卷 998-1003页

作者： Guoting Li HoYin Yip Kin Hang wong Chun Hu Jiuhui Qu po keung wong Department of Environmental and Municipal Engineering North China University of Water Conservancy and Electric Power Zhengzhou 450011 China School of Life Sciences The Chinese University of Hong Kong Shatin N.T. Hong Kong SAR China State Key Laboratory of Environmental Aquatic Chemistry Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beifing 100085 China

β-PbO2 electrodes were prepared by electro-deposition and characterized by scanning electron microscopy,X-ray diffraction,X-ray photoelectron spectroscopy,and linear sweep *** confirmed pure β-PbO2 crystals were on the electrode and it had a high oxygen evolution *** photoactivity and photoelectrochemical（PEC） properties of the β-PbO2 electrode were investigated under visible light irradiation（λ 〉 420 nm） for the decolorization of Methylene *** first-order kinetics parameter（Kapp） for dye decolorization using the β-PbO2 electrode achieved 6.71×10-4 min-1 under visible light irradiation,which indicated its excellent visible light-induced *** Kapp of the PEC process was as much as 1.41×10-3 min-1 and was 1.71 times that of visible light irradiation or electrolysis even in the presence of the β-PbO2 electrode.A significant synergetic effect was observed in the PEC *** also employed TiO2 modified β-PbO2 electrodes in this test,which revealed that the TiO2 immobilized on the β-PbO2 electrode inhibited the visible light-induced PEC efficiency despite the amount of TiO2 used for electrode *** β-PbO2 electrode was also superior to the dimensionally stable anode（Ti/Ru0.3Ti0.7O2） in visible light-induced photoactivity and PEC efficiency.

关键词： photocatalysis photoelectrochemical process visible light β-PbO2 electrode

Advances in photocatalytic disinfection of bacteria:Development of photocatalysts and mechanisms

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Journal of Environmental Sciences 2015年第8期27卷 232-247页

作者： Wanjun Wang Guocheng Huang Jimmy C.Yu po keung wong Department of Chemistry The Chinese University of Hong Kong School of Life Sciences The Chinese University of Hong Kong Institute of Environment Energy and Sustainability The Chinese University of Hong Kong

Photocatalysis has attracted worldwide attention due to its potential in solar energy *** a ＂green＂ advanced oxidation technology, it has been extensively used for water disinfection and wastewater treatment. This article provides a review of the recent progress in solar energy-induced photocatalytic disinfection of bacteria, focusing on the development of highly efficient photocatalysts and their underlying mechanisms in bacterial inactivation. The photocatalysts are classified into Ti O2-based and non-Ti O2-based systems, as Ti O2 is the most investigated photocatalyst. The synthesis methods, modification strategies, bacterial disinfection activities and mechanisms of different types of photocatalysts are reviewed in *** is given to the modified Ti O2, including noble metal deposition, non-metal doping,dye sensitization and composite Ti O2, along with typical non-Ti O2-based photocatalysts for bacterial disinfection, including metal oxides, sulfides, bismuth metallates, graphene-based photocatalysts, carbon nitride-based photocatalysts and natural photocatalysts. A simple and versatile methodology by using a partition system combined with scavenging study is introduced to study the photocatalytic disinfection mechanisms in different photocatalytic systems. This review summarizes the current state of the work on photocatalytic disinfection of bacteria, and is expected to offer useful insights for the future development in the field.

关键词： Photocatalysis Bacterial disinfection TiO2 Bismuth metallates Partition system Disinfection mechanism

Photocatalytic defluorination of perfluorooctanoic acid by surface defective BiOCl:Fast microwave solvothermal synthesis and photocatalytic mechanisms

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Journal of Environmental Sciences 2019年第10期31卷 69-79页

作者： Yuanyuan Sun Guiying Li Wanjun Wang Wenquan Gu po keung wong Taicheng An Guangzhou Key Laboratory Environmental Catalysis and pollution Control Guangdong Key Laboratory of Environmental Catalysis and Health Risk Control School of Environmental Science and Engineering Institute of Environmental Health and Pollution Control Guangdong University of Technology Guangzhou 510006 China School of Life Sciences The Chinese University of Hong Kong Shatin New Territories Hong Kong China

There is an urgent need for developing cost-effective methods for the treatment of perfluorooctanoic acid(PFOA)due to its global emergence and potential *** this study,taking surface-defective BiOCl as an example,a strategy of surface oxygen vacancy modulation was used to promote the photocatalytic defluorination efficiency of PFOA under simulated sunlight *** defective BiOCl was fabricated by a fast microwave solvothermal method,which was found to induce more surface oxygen vacancies than conventional solvothermal and precipitation *** a result,the asprepared BiOCl showed significantly enhanced defluorination efficiency,which was 2.7 and33.8 times higher than that of BiOCl fabricated by conventional solvothermal and precipitation methods,*** studies indicated that the defluorination of PFOA follows a direct hole(h^+)oxidation pathway with the aid of·OH,while the oxygen vacancies not only promote charge separation but also facilitate the intimate contact between the photocatalyst surface and PFOA by coordinating with its terminal carboxylate group in a bidentate or bridging *** work will provide a general strategy of oxygen vacancy modulation by microwave-assisted methods for efficient photocatalytic defluorination of PFOA in the environment using sunlight as the energy source.

关键词： Photocatalysis Perfluorooctanoic acid Oxygen vacancy Microwave method BiOCl

Synthesis of novel p-n heterojunction m-Bi_2O_4/BiOCl nanocomposite with excellent photocatalytic activity through ion-etching method

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Chinese Journal of Catalysis 2018年第11期39卷 1792-1803页

作者： Junxiu Wang Zhenzong Zhang Xi Wang Yi Shen Yongfu Guo po keung wong Renbi Bai Center for Separation and Purification Materials&Technologies Suzhou University of Science and TechnologySuzhou 215009JiangsuChina School of Life Science The Chinese University of Hong KongShatinHong KongChina

A novel p‐n heterostructure photocatalyst m‐Bi2O4/BiOCl was successfully synthetized through a facile ion‐etching *** adjusting the added volume of HCl solution,a series of different ratios of composite photocatalysts were *** as‐prepared samples of physical,chemical and optical characteristics were examined by X‐ray diffraction,scanning electron microscope,transmission electron microscope,energy dispersive X‐ray spectroscopy,selected‐area electron diffraction,Fourier transform infrared absorption,Raman microscope,N2 adsorption‐desorption,X‐ray photoelectron spectroscopy and UV‐vis spectrum *** photocatalysts showed high degradation rate and complete mineralization ability for methyl orange and tetracycline solution under visible *** reaction rate constant of m‐Bi2O4/BiOCl for methyl orange was 52.28 times higher than that of *** characterization presented a good stability of ***,the photocurrent response test certified that the heterostructure effectively accelerated the separation and migration of photo‐generated *** scavenger experiments evidenced that hole(h+)and superoxide radical(?O2?)were the primary active radicals.A possible photocatalytic mechanism was *** work provided an alternative photocatalyst applied to water environmental remediation.

关键词： Dibismuth tetroxide Photocatalysis Methylene orange Tetracycline Degradation mechanism

Molecular oxygen activation enhancement by BiOBr0.5I0.5/BiOI utilizing the synergistic effect of solid solution and heterojunctions for photocatalytic NO removal

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Chinese Journal of Catalysis 2020年第10期41卷 1480-1487页

作者： Mingpu Kou Yu Deng Rumeng Zhang Li Wang po keung wong Fengyun Su Liqun Ye Engineering Technology Research Center of Henan Province for Solar Catalysis College of Chemistry and Pharmaceutical EngineeringNanyang Normal UniversityNanyang 473061HenanChina College of Materials and Chemical Engineering Key Laboratory of Inorganic Nonmetallic Crystalline and Energy Conversion MaterialsChina Three Gorges UniversityYichang 443002HubeiChina School of Life Sciences The Chinese University of Hong KongShatinNTHong Kong SARChina

To improve the photocatalytic oxidation reaction activity for NO removal, photocatalysts with excellent activity are required to activate molecular oxygen. Solid solution and heterojunction were suggested as effective strategies to enhance the molecular oxygen activation viaexciton and carrier photocatalysis. In this study, a solid solution and heterojunction containing BiOBr0.5I0.5/BiOI catalyst was synthesized, and it showed improved photocatalytic activity for removing NO. The photocatalytic NO removal mechanism indicated that synergistic effects between the solid solution and heterojunction induced the enhanced activity for molecular oxygen activation. The photogenerated holes, superoxide, and singlet oxygen generated by the carrier and exciton photocatalysis supported the high photocatalytic NO removal efficiency. This study provides new ideas for designing efficient Bi-O-X(X = Cl, Br, I) photocatalysts for oxidation reactions.

关键词： BiOBr0.5I0.5/BiOI NO removal Molecular oxygen activation Carrier Exciton

Microwave-assisted synthesis of defective tungsten trioxide for photocatalytic bacterial inactivation:Role of the oxygen vacancy

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Chinese Journal of Catalysis 2020年第10期41卷 1488-1497页

作者： Wenquan Gu Wanjun Wang Guiying Li Haojing Xiea po keung wong Taicheng An Guangzhou Key Laboratory Environmental Catalysis and pollution Control Guangdong Key Laboratory of Environmental Catalysis and Health Risk ControlSchool o f Environmental Science and EngineeringInstitute o f Environmental Health and Pollution ControlGuangdong University of TechnologyGuangzhou 510006GuangdongChina School of Life Sciences The Chinese University of Hong KongShatinNTHong KongChina

Surface defect modulation has emerged as a potential strategy for promoting the photocatalytic activity of photocatalysts for various applications, while the impact of the oxygen vacancy on bacterial inactivation is still debated. In this study, oxygen vacancies were introduced to tungsten trioxide nanosheets(WO3–x) via a microwave-assisted route. The as-prepared WO3–x nanosheets exhibited excellent visible-light-driven photocatalytic activity toward E. coli K-12 inactivation, and 6 log orders of the bacterial cells could be completely inactivated within 150 min. The obtained bacterial inactivation rate constant was 15.2 times higher than that of pristine WO3 without oxygen vacancies, suggesting that the surface oxygen vacancy could significantly promote the bacterial inactivation efficiency. The mechanism study indicated that the inactivation of bacterial cells occurs via a direct h+ oxidation pathway. In addition, the role of the oxygen vacancy was studied in detail;the oxygen vacancy was found to not only promote interfacial charge separation but also tune the band structure of WO3, thereby leading to increased h+ oxidation power. Finally, a possible oxygen vacancy-dominated photocatalytic bacterial inactivation mechanism is proposed. This work is expected to offer new insights into the microwave-assisted synthesis of defective photocatalysts and the use of the oxygen vacancy for promoting photocatalytic antibacterial activities.

关键词： Photocatalysis WO3 Microwave Oxygen vacancy Bacterial inactivation

Bifunctional S-scheme g-C3N4/Bi/BiVO4 hybrid photocatalysts toward artificial carbon cycling

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Chinese Journal of Catalysis 2020年第1期41卷 140-153页

作者： Quan Xie Wanmei He Shengwei Liu Chuanhao Li Jinfeng Zhang po keung wong School of Environmental Science and Engineering Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation TechnologySun Yat-sen UniversityGuangzhou 510006GuangdongChina College of Physics and Electronic Information Huaibei Normal UniversityHuaibei 235000AnhuiChina School of Life Sciences The Chinese University of Hong KongShatinNTHong KongChina Institute of Environmental Health and pollution Control School of Environmental Science&EngineeringGunagdong University of TechnologyGuangzhou 510006GuangdongChina

Although both the aerobic photocatalytic oxidation of organic pollutants into CO2 and the anaerobic photocatalytic reduction of CO2 into solar fuels have been intensively studied,few efforts have been devoted to combining these carbon-involved photocatalytic oxidation-reduction processes together,by which an artificial photocatalytic carbon cycling process can be *** key challenge lies in the exploitation of efficient bifunctional photocatalysts,capable of triggering both aerobic oxidation and anaerobic reduction *** this work,a bifunctional ternary g-C3N4/Bi/BiVO4 hybrid photocatalyst is successfully constructed,which not only demonstrates superior aerobic photocatalytic oxidation performance in degrading an organic pollutant(using the dye,Rhodamine B as a model),but also exhibits impressive photocatalytic CO2 reduction performance under anaerobic ***,a direct conversion of Rhodamine B to solar fuels in a one-pot anaerobic reactor can be achieved with the as-prepared ternary g-C3N4/Bi/BiVO4 hybrid *** excellent bifunctional photocatalytic performance of the g-C3N4/Bi/BiVO4 photocatalyst is associated with the formation of efficient S-scheme hybrid junctions,which contribute to promoting the appropriate charge dynamics,and sustaining favorable charge *** formation of the S-scheme heterojunction is supported by scavenger studies and density functional theory ***,the in-situ formed plasmonic metallic Bi nanoparticles in the S-scheme hybrid g-C3N4/Bi/BiVO4 photocatalyst enhances vectorial interfacial electron *** novel bifunctional S-scheme g-C3N4/Bi/BiVO4 hybrid photocatalyst system provides new insights for the further development of an integrated aerobic-anaerobic reaction system for photocatalytic carbon cycling.

关键词： S-scheme Plasmonic Bi nanoparticles Photocatalytic CO2 reduction Photocatalytic degradation of organic pollutants Carbon cycling

Solar‐energy‐driven photothermal catalytic C–C coupling from CO_(2) reduction over WO_(3–x)

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Chinese Journal of Catalysis 2022年第5期43卷 1230-1237页

作者： Yu Deng Jue Li Rumeng Zhang Chunqiu Han Yi Chen Ying Zhou Wei Liu po keung wong Liqun Ye College of Materials and Chemical Engineering Key Laboratory of Inorganic Nonmetallic Crystalline and Energy Conversion MaterialsChina Three Gorges UniversityYichang 443002HubeiChina State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation School of Materials Science and EngineeringSouthwest Petroleum UniversityChengdu610500SichuanChina School of Life Sciences The Chinese University of Hong KongShatinHong Kong SARChina

Solar‐energy‐driven catalytic CO_(2) reduction for the production of value‐added carbon‐based materials and chemical raw materials has attracted great interest to alleviate the global climate change and energy *** production of multicarbon(C2)products through CO_(2) reduction is extremely attractive,however,the yield and selectivity of C2 products remain low because of the low reaction temperature required and the low photoelectron density of the ***,we introduce WO3–x,which contains oxygen vacancies and exhibits an excellent photothermal conversion efficiency,to improve the generation of C2 products(C2H4 and C2H6)under simulated sunlight(UV‐Vis‐IR)***3–x produced 5.30 and 0.93μmol·g^(–1)C2H4 and C2H6,respectively,after 4 h,with a selectivity exceeding 34%.In situ Fourier transform infrared spectra and theoretical calculations showed that the oxygen vacancies enhanced the water activation and hydrogenation of adsorbed CO for the formation of C2 products via C–C coupling from CH2/CH3 *** findings of this study could assist in the design of highly active solar‐energy‐driven catalysts to produce C–C coupling products through CO2 reduction.

关键词： WO_(3) Oxygen vacancy CO_(2) reduction Photothermal C–C coupling