Son, Aseom Lee, Jiho Seid, Mingizem Gashaw Rahman, Evandi Choe, Jaewan Cho, Kangwoo Lee, Jaesang Hong, Seok Won 2024-01-19T11:03:09Z 2024-01-19T11:03:09Z 2022-06-30 2022-10 0926-3373 https://pubs.kist.re.kr/handle/201004/114538 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. English Elsevier BV Ti3+ self-doped TiO2 nanotube arrays revisited as Janus photoelectrodes for persulfate activation and water treatment Article 10.1016/j.apcatb.2022.121543 1 Applied Catalysis B: Environmental, v.315 Applied Catalysis B: Environmental 315 Y scie scopus 000809949300002 Chemistry, Physical Engineering, Environmental Engineering, Chemical Chemistry Engineering Article ADVANCED OXIDATION PROCESSES BISPHENOL-A DEGRADATION GENERATION CARBON MECHANISM KINETICS ENHANCEMENT PERFORMANCE REMOVAL Organic contaminants Persulfate activation Photoelectrochemical oxidation/reduction Symmetric electrode system Self-doped TiO2 nanotube array