Degradation of aniline by electrochemical activation of peroxydisulfate at MWCNT cathode: The proofed concept of nonradical oxidation process. (September 2018)

• Record Type: Journal Article
• Authors: Nie, Chunyang; Ao, Zhimin; Duan, Xiaoguang; Wang, Chengying; Wang, Shaobin; An, Taicheng
• Is Part Of: Chemosphere. Volume 206(2018)
• Page Start: 432
• Page End: 438
• Publication Date: 2018-09
• Subjects: Aniline elimination -- Electrochemical activation -- Peroxydisulfate -- Multiwalled carbon nanotubes cathode -- Nonradical oxidation; Pollution -- Periodicals; Pollution -- Physiological effect -- Periodicals; Environmental sciences -- Periodicals; Atmospheric chemistry -- Periodicals; 551.511
• DOI: 10.1016/j.chemosphere.2018.04.173
• Languages: English
• ISSNs: 0045-6535

Abstract

Abstract: Enhanced elimination of aniline in aqueous solution was achieved by coupling electrosorption of aniline and electrochemical activation of peroxydisulfate (PDS) at multi-walled carbon nanotube (MWCNT) cathode, in which a synergistic effect occurred. It was found that PDS could be effectively activated under a small voltage at MWCNT cathode owing to the specific pore structures of MWCNTs. A nonradical oxidation pathway instead of radical-based oxidation was proposed from the cathodic activation of PDS, wherein PDS molecules with a modified electronic structure was suggested to be the principal reactive species. Meanwhile, the influences of various operation parameters such as electrode potential, PDS concentration, presence of chloride ions on the elimination efficiency, and the stability of MWCNT electrode were also attempted. Therefore, the electrochemical activation of PDS by MWCNT cathode is a promising energy-saving method for the treatment of organic pollutants in wastewater. Highlights: Peroxydisulfate (PDS) was activated under a low working voltage by using a multi-walled carbon nanotube (MWCNT) cathode. Nonradical oxidation pathway was proposed to be induced from the electrochemical activation (EC) of PDS at MWCNT cathode. Enhanced degradation of aniline with lower energy consumption was achieved by EC/MWCNTs/PDS system.