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

Eun Tae Yun, Ha Young Yoo, Wooyul Kim, Hyung Eun Kim, Gyeongho Kang, Hongshin Lee, Seunghak Lee, Taiho Park, Changha Lee, Jae Hong Kim, Jaesang Lee

Research output: Contribution to journalArticle

43 Citations (Scopus)

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[rad]+) 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[rad]). The dye-sensitized IO4 activation process was also found to be highly effective in inactivation of MS2 bacteriophage.

Original languageEnglish
Pages (from-to)475-484
Number of pages10
JournalApplied Catalysis B: Environmental
Volume203
DOIs
Publication statusPublished - 2017 Apr 1

Keywords

  • Dye sensitization
  • Electron transfer
  • Periodate activation
  • Radical
  • Visible light

ASJC Scopus subject areas

  • Catalysis
  • Environmental Science(all)
  • Process Chemistry and Technology

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