Degradation of triclosan by anodic oxidation/in-situ peroxone process: Kinetics, pathway and reaction mechanism

被引：21

作者：

Qu, Chao ^{[1
]}

Ren, Na ^{[1
]}

Zhang, Shu-jun ^{[2
]}

Li, Yan-gang ^{[2
]}

Meng, Shu-juan ^{[1
]}

Li, Xiao-hu ^{[1
]}

Wang, Shan-quan ^{[3
]}

Liang, Da-wei ^{[1
,4
]}

Li, An-ran ^{[5
]}

机构：

[1] Beihang Univ, Sch Space & Environm, Beijing Key Lab Bioinspired Energy Mat & Devices, Shahe Campus, Beijing 102206, Peoples R China

[2] Beijing Drainage Grp Co Ltd BDG, Beijing 100044, Peoples R China

[3] Sun Yat Sen Univ, Sch Environm Sci & Engn, Guangzhou 510275, Guangdong, Peoples R China

[4] Beijing Univ Technol, Natl Engn Lab Adv Municipal Wastewater Treatment, Beijing 100124, Peoples R China

[5] Beihang Univ, Beijing Adv Innovat Ctr Big Data Based Precis Med, Sch Chem, Beijing 100191, Peoples R China

来源：

CHEMOSPHERE | 2021年 / 272卷

基金：

中国国家自然科学基金;

关键词：

Triclosan; Eletro-oxidation; Peroxone; Intermediates; Emerging contaminants;

D O I：

10.1016/j.chemosphere.2020.129453

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Triclosan (TCS) is an emerging contaminant that threatens the environment and human health. This study was conducted to investigate TCS abatement by a novel electro-oxidation (EO) process, which used a Ti-based nickel and antimony doped tin oxide (NATO/Ti) anode and a carbon nanotubes (CNTs) doped carbon/PTFE (CNTs-C/PTFE) gas diffusion electrode (GDE) for oxygen reduction reaction (ORR). A comparative study was also performed for TCS degradation by using a traditional EO with a nickel foam cathode, termed as HER-EO. The optimal initial TCS concentration, current density and solution pH for TCS degradation during the ORR-EO and HER-EO were investigated. Results showed that ORR-EO removed more than 98% of TCS in 10-60 min under the concentration of 5-50 mg/L. The TCS degradation followed pseudo-first-order kinetics and its main intermediates were observed during the ORREO and HER-EO using liquid chromatography combined mass (LC-MS). The results of FED analysis and toxicity prediction by ECOSAR software showed that less intermediates accumulated during the ORR-EO and the residues were less harmful. The ORR-EO degradation mechanism for TCS was attacking on the ether bond and the benzene ring by (OH)-O-center dot. This novel ORR-EO process exhibits a great merit in the field of emerging contaminants abatement. (C) 2020 Elsevier Ltd. All rights reserved.

引用

页数：9

共 35 条

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