The removal efficiencies and mechanism of aniline degradation by peroxydisulfate activated with magnetic Fe-Mn oxides composite

• Published in: Journal of water reuse and desalination Vol. 11; no. 2; pp. 212 - 223
• Main Authors: Qiao, Lin, Shi, Yu, Cheng, Qingli, Liu, Bingtao, Liu, Jing
• Format: Journal Article
• Language: English
• Published: London IWA Publishing 01.06.2021
• Subjects: Alcohols; Aniline; Butanol; Catalysis; Catalysts; Catalytic oxidation; Chemical precipitation; Decomposition; Degradation; Ethylenediaminetetraacetic acids; fe-mn oxides; Free radicals; High performance liquid chromatography; HPLC; intermediate; Intermediates; Iron; Liquid chromatography; Manganese; Mass spectrometry; Mass spectroscopy; Metal oxides; Methods; oxidation; Oxygen; peroxydisulfate; Pollutants; reaction mechanism; Sodium; Sodium azide; Sodium azides; Spectrum analysis; Sulphates; China; Japan
• ISSN: 2220-1319; 2709-6092; 2408-9370; 2709-6106
• DOI: 10.2166/wrd.2021.102

Abstract The Fe-Mn oxides composite prepared by a chemical co-precipitation method was used as a heterogenous peroxydisulfate catalyst for the decomposition of aniline. This study investigated the mechanism of aniline degradation by PDS activated with catalyst. Reactive species resulting in the degradation of aniline was investigated via radical quenching experiments with different scavengers, including methanol, tert-butyl alcohol, EDTA and sodium azide. Based on the experiments made here, it is speculated that the predominant reactive species responsible for the degradation of aniline may be holes and singlet molecular oxygen rather than SO4·− and ·OH radicals. The degradation of compounds in catalyst/peroxydisulfate system was put forward. The three possible intermediates were speculated by high performance liquid chromatography-mass spectrometry, and two possible degradation pathways were proposed.