Visible-light-induced activation of periodate that mimics dye-sensitization of TiO2: Simultaneous decolorization of dyes and production of oxidizing radicals

Title
Visible-light-induced activation of periodate that mimics dye-sensitization of TiO2: Simultaneous decolorization of dyes and production of oxidizing radicals
Authors
이승학윤은태유하영김우열김형은강경호이홍신박태호이창하김재홍이재상
Keywords
Periodate activation; Electron transfer; Radical; Visible light; Dye sensitizationa
Issue Date
2017-04
Publisher
Applied catalysis B, Environmental
Citation
VOL 203-484
Abstract
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 (RhBradical 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 (IO3radical dot). The dye-sensitized IO4− activation process was also found to be highly effective in inactivation of MS2 bacteriophage.
URI
http://pubs.kist.re.kr/handle/201004/64929
ISSN
0926-3373
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KIST Publication > Article
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