期刊
APPLIED CATALYSIS B-ENVIRONMENTAL
卷 203, 期 -, 页码 475-484出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apcatb.2016.10.029
关键词
Periodate activation; Electron transfer; Radical; Visible light; Dye sensitization
资金
- National Research Foundation of Korea Grant - Korea Government [NRF-2014R1A1A2056935]
- National Research Foundation of Korea Grant - Ministry of Science, ICT, and Future Planning [2016M3A7B4909318]
- National Research Foundation of Korea (NRF) grant - Korea government [NRF-2016R1A4A1010735]
- KIST-UNIST Partnership Program [2.140442.01]
Inspired by the mechanism behind self-sensitized destruction of dyes on semiconductor photocatalysts, we herein present the first instance of visible-light-induced activation of periodate (IO4-) into reactive iodine radicals via sensitized electron transfer from an organic dye, Rhodamine B (RhB). The IO4- reduction not only leads to oxidative decolorization of RhB but also formation of reactive intermediates that degrade organic compounds. Electron transfer from the excited dye to IO4- was confirmed by detecting RhB radical cation (RhB center dot+) and measuring its lifetime. The efficiency of organic compound degradation was found to significantly vary depending on the target substrate, i.e., phenol, bisphenol A, and 4-chlorophenol were rapidly decomposed, whereas benzoic acid, carbamazepine, 4-nitrophenol, and sulfamethoxazole exhibited moderate decomposition rate. Lines of evidence in addition to the substrate specificity, such as insignificant hydroxylation, non-stoichiometric dechlorination, and marginal quenching effects of organic/inorganic compounds (e.g., methanol, natural organic matters, and chloride ion), points toward the involvement of iodate radical (IO3 center dot). The dye-sensitized IO4- activation process was also found to be highly effective in inactivation of MS2 bacteriophage. (C) 2016 Elsevier B.V. All rights reserved.
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