TY - JOUR
T1 - Ti3+ self-doped TiO2 nanotube arrays revisited as Janus photoelectrodes for persulfate activation and water treatment
AU - Son, Aseom
AU - Lee, Jiho
AU - Seid, Mingizem Gashaw
AU - Rahman, Evandi
AU - Choe, Jaewan
AU - Cho, Kangwoo
AU - Lee, Jaesang
AU - Hong, Seok Won
N1 - Funding Information:
This work was supported by the Korea Environmental Industry & Technology Institute (KEITI) through “Project of Developing Innovative Drinking Water and Wastewater Technologies”, funded by the Korea Ministry of Environment (MOE) [grant number 2019002710010 ] and the institutional program of Korea Institute of Science and Technology (KIST) [grant number 2E31932 and 2E31934 ].
Publisher Copyright:
© 2022 The Authors
PY - 2022/10/15
Y1 - 2022/10/15
N2 - 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.
AB - 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.
KW - Organic contaminants
KW - Persulfate activation
KW - Photoelectrochemical oxidation/reduction
KW - Self-doped TiO nanotube array
KW - Symmetric electrode system
UR - http://www.scopus.com/inward/record.url?scp=85130915725&partnerID=8YFLogxK
U2 - 10.1016/j.apcatb.2022.121543
DO - 10.1016/j.apcatb.2022.121543
M3 - Article
AN - SCOPUS:85130915725
SN - 0926-3373
VL - 315
JO - Applied Catalysis B: Environmental
JF - Applied Catalysis B: Environmental
M1 - 121543
ER -