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Effects of electrolyte concentration and anion identity on photoelectrochemical degradation of phenol: Focusing on the change at the photoanode/solution interface

Authors
Lee, Y.Khim, J.
Issue Date
12월-2021
Publisher
Elsevier Ltd
Keywords
Anion effects; Electron-hole pair generation rate; Interfacial electron transfer rate; Photoelectrocatalysis; Quantum efficiency
Citation
Journal of Environmental Chemical Engineering, v.9, no.6
Indexed
SCIE
SCOPUS
Journal Title
Journal of Environmental Chemical Engineering
Volume
9
Number
6
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/135814
DOI
10.1016/j.jece.2021.106717
ISSN
2213-3437
Abstract
The effects of electrolytes on phenol degradation by typical photoelectrochemical cell (PEC) composed of TiO2-nanotube array (TNTA) and Pt were studied in terms of interfacial parameters; quantum efficiency, h+ generation rate, relative interfacial electron transfer rate, and equivalent resistances. Three different anions, Cl−, ClO4−, and SO42−, and 10−5 to 10−1 M of electrolyte concentrations have been covered. For all concentrations of interest, pseudo-1st-order kinetic constants for phenol degradation were 4.775 × 10−4–1.175 × 10−3, 3.974 × 10−4–8.893 × 10−3, and 3.902 × 10−4–8.810 × 10−4 min−1 for SO42−, Cl−, and ClO4−, respectively. The results of h+-generation rate, and relative electron transfer rate confirms that the rate of reactions at electrode/solution interface is in the order of SO42−, ClO4−, and Cl−; 0.038–3.552%, 0.023–2.900%, and 0.021–2.814% were obtained for the quantum efficiency of SO42−, ClO4−, and Cl−, respectively. The inconsistent trend between phenol degradation kinetic and quantum efficiency in terms of anion species shows that the phenol is mainly decomposed by the oxidant produced through the interfacial reactions, not by direct reaction between TiO2 and phenol. The difference in terms of anions would be attributed to the product of anions since the radicals other than hydroxyl radical would provide the retardation pathways to prolong the lifetime of radicals. © 2021 Elsevier Ltd
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Khim, Jee hyeong
공과대학 (건축사회환경공학부)
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