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Ti3+ self-doped TiO2 nanotube arrays revisited as Janus photoelectrodes for persulfate activation and water treatmentopen access

Authors
Son, AseomLee, JihoSeid, Mingizem GashawRahman, EvandiChoe, JaewanCho, KangwooLee, JaesangHong, Seok Won
Issue Date
15-10월-2022
Publisher
ELSEVIER
Keywords
Organic contaminants; Persulfate activation; Photoelectrochemical oxidation/reduction; Symmetric electrode system; Self-doped TiO2 nanotube array
Citation
APPLIED CATALYSIS B-ENVIRONMENTAL, v.315
Indexed
SCIE
SCOPUS
Journal Title
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume
315
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/142858
DOI
10.1016/j.apcatb.2022.121543
ISSN
0926-3373
Abstract
This study investigates the binary role of Ti3+ self-doped TiO2 nanotubes (bl-TNA) as an anode as well as a cathode in the photoelectrochemical (PEC) oxidative treatment of organic contaminants. Compared to the Ti cathode-based asymmetric system, the symmetric PEC system with Janus bl-TNA photoelectrodes demonstrated higher interfacial charge transfer, photoresponsive activity, and kinetic constant for bisphenol-A (BPA) degradation. The bl-TNA photocathode enhanced the formation of radicals by providing additional reaction sites for photocatalytic reactions and cathodic peroxydisulfate (PDS) activation. Additionally, the rate constant ratio for BPA degradation between the anode and cathode in the symmetric system changed from 7.5:1-1.3:1 under PEC and PEC/PDS conditions, indicating that PDS addition enhanced the photoactivity of the electrodes, with a higher rate at the cathode. Finally, only 2.4% performance decline was observed after 64 h with the periodic polarity reversal operation, demonstrating the long-term stability of the proposed PEC system.
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공과대학 (건축사회환경공학부)
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