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您的检索式：作者名="Manjun ZHAN"
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| 1 | Determination of photochemically-generated reactive oxygen species in natural water显示文摘Reactive oxygen species(ROS) can be produced by interactions between sunlight and light-absorbing substances in natural water environment.ROS may participate in the indirect photolysis of trace organic pollutants,therefore resulting in changes in their environmental fates and ecological risks in natural water systems.Bisphenol A(BPA),an endocrine-disrupting chemical,exits widely in natural waters.The photodegradation of BPA promoted by ROS(.OH,1O2,HO2./O2·-),which were produced on the excitation of ubiquitous constituents(such as nitrate ion,humic substances and Fe(Ⅲ)-oxalate complexes) in natural water under simulated solar radiation was investigated.Both molecular probe method and electron spin resonance(ESR) test were used for the characterization of the generated ROS.It was found that.OH was photochemically produced in the presence of nitrate ions,humic substances and Fe(Ⅲ)-oxalate complexes and that 1O2 was produced with the presence of humic substances.The steady-state concentrations of.OH was 1.27×10-14 mol/L in a nitrate solution,and the second-order rate constant of BPA with.OH was 1.01×1010 L/(mol.s). | ZHAN Manjun Nanjing Research Institute of Environmental Protection,Nanjing 210013,China. | 2009 | Journal of Environmental Sciences2009，21，3： | 2 |
| 2 | Investigation of the effects of humic acid and H_(2)O_(2) on the photocatalytic degradation of atrazine assisted by microwave显示文摘A solution of atrazine in a TiO_(2)suspension,an endocrine disruptor in natural water,was tentatively treated by microwave-assisted photocatalytic technique.The effects of mannitol,oxygen,humic acid,and hydrogen dioxide on the photodegradation rate were explored.The results could be deduced as follows:the photocatalytic degradation of atrazine fits the pseudo-first-order kinetic well with k=0.0328 s–1,and·OH was identified as the dominant reactant.Photodegradation of atrazine was hindered in the presence of humic acid,and the retardation effect increased as the concentration of humic acid increased.H_(2)O_(2)displayed a significant negative influence on atrazine photocatalysis efficiency.Based on intermediates identified with gas chromatography-mass spectrometry(GC-MS)and Liquid chromatography-mass spectrometry(LC-MS/MS)techniques,the main degradation routes of atrazine are proposed. | Chao QIN Shaogui YANG Cheng SUN Manjun ZHAN Rongjun WANG Huanxing CAI Jia ZHOU | 2010 | Frontiers of Environmental Science & Engineering2010，4，3： | 1 |
| 3 | Effect of natural aquatic humic substances on the photodegradation of bisphenol A显示文摘The photochemical degradation of bisphenol A(BPA)was studied in the presence of natural humic sub stances from different origins under simulated solar irradiation.BPA underwent insignificant direct photolysis in neutral water,but rapid photosensitized degradation in four humic substances solutions via pseudo-first-order reaction occurred.The photo-degradation rate of BPA was insensitive to the different initial BPA concentrations and was inhibited in aerated solution compared with the deoxygenated medium.The reactive oxy-gen species(ROS)such as·OH and 1O2 produced from excita-tion of humic substances under irradiation was determined from the quenching kinetic experiment using molecular probe.The five main intermediate photoproducts of BPA in Nordic lake fulvic acid(NOFA)were tentatively identified using gas chromatography/mass spectrometer(GC/MS).Based on the identification of ROS and the analysis of photoproduct formation,the possible phototransformation pathways of BPA were proposed,involving the direct pho-tolysis due to the energy transfer from the triplet state humic substance(3HS*)to BPA molecules and hydroxyl radical addition and oxidation as well. | ZHAN Manjun YANG Xi YANG Hongshen KONG Lingren | 2007 | Frontiers of Environmental Science & Engineering2007，1，3： | 0 |
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