Visible-light-induced activation of periodate that mimicsdye-sensitization of TiO2: Simultaneous decolorization of dyes andproduction of oxidizing radicals
SCIE
SCOPUS
- Title
- Visible-light-induced activation of periodate that mimicsdye-sensitization of TiO2: Simultaneous decolorization of dyes andproduction of oxidizing radicals
- Authors
- Eun-Tae Yun; Ha-Young Yoo; Wooyul Kim; Hyung-Eun Kim; Gyeongho Kang; Hongshin Lee; Seunghak Lee; Park, T; Changha Lee; Jae-Hong Kim; Jaesang Lee
- Date Issued
- 2017-04
- Publisher
- ELSEVIER SCIENCE BV
- 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 (RhB+) 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). The dye-sensitized IO4− activation process was also found to be highly effective in inactivation of MS2 bacteriophage.
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/36658
- DOI
- 10.1016/J.APCATB.2016.10.029
- ISSN
- 0926-3373
- Article Type
- Article
- Citation
- APPLIED CATALYSIS B-ENVIRONMENTAL, vol. 203, page. 475 - 484, 2017-04
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