Detection of active oxidative species in TiO2 photocatalysis using the fluorescence technique |
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| Institution: | 1. Kanagawa Academy of Science and Technology, KSP Building, 3-2-1 Sakado, Takatsu-ku, Kawasaki, Kanagawa 213-0012, Japan;2. Department of Applied Chemistry, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan;3. Research Center for Advanced Science and Technology, The University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo 153-8904, Japan;1. School of Chemistry and Biochemistry, Yeungnam University, Gyeongsan, 38541, Republic of Korea;2. Chemical Sciences, Faculty of Science, Universiti Brunei Darussalam, Jalan Tungku Link, Gadong, BE 1410, Brunei Darussalam;1. Department of Physics, Aligarh Muslim University, Aligarh 202002, India;2. Centre of Excellence in Materials Science (Nanomaterials), Department of Applied Physics, Z.H. College of Engineering & Technology, Aligarh Muslim University, Aligarh 202002, India;1. Ege University, Faculty of Engineering, Department of Chemical Engineering, 35100 Bornova, Izmir, Turkey;2. Izmir Institute of Technology, Faculty of Engineering, Department of Chemical Engineering, 35430 Urla, Izmir, Turkey;1. College of Ecological Environment and Urban Construction, Fujian University of Technology, Fuzhou, Fujian, 350118, China;2. Department of Safety, Health and Environmental Engineering, National Yunlin University of Science and Technology (YunTech), Douliou, Yunlin, 64002, Taiwan;1. Department of Environmental Sciences and Biotechnology, Hallym University, Chuncheon, Gangwon-do 24252, Republic of Korea;2. Department of Chemistry, Hallym University, Chuncheon, Gangwon-do 24252, Republic of Korea;3. Korea Polar Research Institute (KOPRI), Incheon 21990, Republic of Korea;4. Department of Earth System Science, University of California, Irvine, CA 92697, United States |
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| Abstract: | The active oxidative species (mainly corresponding to hydroxyl radicals (· OH)) produced on TiO2 film photocatalyst in aerated aqueous solution have been quantitatively investigated by measuring the fluorescence derived by the reaction with either coumarin or terephthalic acid. Upon UV light illumination, coumarin in aqueous solution and terephthalic acid in NaOH solution were converted on the TiO2 film photocatalyst to highly fluorescent hydroxy products. Analysis of the resultant hydroxy compounds provides sensitive and specific monitoring of the generated active oxidative species. The rate of active species formation could be determined by the time dependence of the increase in concentration of the resultant hydroxy products. Using this fluorescence method, the effect of light intensity on the generation efficiency of active oxidative species was examined. The obtained results show that the efficiency of active oxidative species formation is constant at the UV intensity from 50 μW cm−2 to 15 mW cm−2, which is consistent with the results for · OH detection reported recently by the use of other techniques. |
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