Visible-light-induced activation of periodate that mimics dye-sensitization of TiO2: Simultaneous decolorization of dyes and production of oxidizing radicals
- Authors
- Yun, Eun-Tae; Yoo, Ha-Young; Kim, Wooyul; Kim, Hyung-Eun; Kang, Gyeongho; Lee, Hongshin; Lee, Seunghak; Park, Taiho; Lee, Changha; Kim, Jae-Hong; Lee, Jaesang
- Issue Date
- 4월-2017
- Publisher
- ELSEVIER SCIENCE BV
- Keywords
- Periodate activation; Electron transfer; Radical; Visible light; Dye sensitization
- Citation
- APPLIED CATALYSIS B-ENVIRONMENTAL, v.203, pp.475 - 484
- Indexed
- SCIE
SCOPUS
- Journal Title
- APPLIED CATALYSIS B-ENVIRONMENTAL
- Volume
- 203
- Start Page
- 475
- End Page
- 484
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/84067
- DOI
- 10.1016/j.apcatb.2016.10.029
- ISSN
- 0926-3373
- 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 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.
- Files in This Item
- There are no files associated with this item.
- Appears in
Collections - College of Engineering > School of Civil, Environmental and Architectural Engineering > 1. Journal Articles
Items in ScholarWorks are protected by copyright, with all rights reserved, unless otherwise indicated.