Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 315, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apcatb.2022.121543
Keywords
Organic contaminants; Persulfate activation; Photoelectrochemical oxidation/reduction; Symmetric electrode system; Self-doped TiO2 nanotube array
Funding
- Korea Environmental Industry & Technology Institute (KEITI) through Project of Developing Innovative Drinking Water and Wastewater Technologies - Korea Ministry of Environment (MOE) [2019002710010]
- institutional program of Korea Institute of Science and Technology (KIST) [2E31932, 2E31934]
Ask authors/readers for more resources
This study investigates the dual role of Ti3+ self-doped TiO2 nanotubes (bl-TNA) as both an anode and a cathode in the photoelectrochemical (PEC) oxidative treatment of organic contaminants. The symmetric PEC system with bl-TNA photoelectrodes demonstrates higher interfacial charge transfer, photoresponsive activity, and kinetic constant for organic degradation compared to the asymmetric system with Ti cathodes. The addition of cathodic peroxydisulfate (PDS) enhances the photoactivity of the electrodes, particularly at the cathode.
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.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available