Comparing dark-and photo-Fenton-like degradation of emerging pollutant over photo-switchable Bi2WO6/CuFe2O4:Investigation on dominant reactive oxidation species

• 作者: Jingjing Jiang Jiaying Gao Shu Niu Xingyue Wang Tianren Li Shengda Liu Yanhong Lin Tengfeng Xie Shuangshi Dong
• 来源期刊: 环境科学学报（英文版）
• 年，卷（期）: 2021,（8）
• 所属期刊栏目: Regular articles
• 页码范围: 147-160
• 页数: 14页
• 语种: 英文

摘要

The extensive use of tetracycline hydrochloride (TCH) poses a threat to human health and the aquatic environment.Here,magnetic p-n Bi2WO6/CuFe2O4 catalyst was fabricated to efficiently remove TCH.The obtained Bi2WO6/CuFe2O4 exhibited 92.1％ TCH degradation ef-ficiency and 50.7％ and 35.1％ mineralization performance for TCH and raw secondary efflu-ent from a wastewater treatment plant in a photo-Fenton-like system,respectively.The re-markable performance was attributed to the fact that photogenerated electrons accelerated the Fe(Ⅲ)/Fe(Ⅱ) and Cu(Ⅱ)/Cu(Ⅰ) conversion for the Fenton-like reaction between Fe(Ⅱ)/Cu(Ⅰ)and H2O2,thereby generating abundant ·OH for pollutant oxidation.Various environmen-tal factors including H2O2 concentration,initial pH,catalyst dosage,TCH concentration and inorganic ions were explored.The reactive oxidation species (ROS) quenching results and electron spin resonance (ESR) spectra confirmed that ·O2-and ·OH were responsible for the dark and photo-Fenton-like systems,respectively.The degradation mechanisms and pathways of TCH were proposed,and the toxicity of products was evaluated.This work contributes a highly efficient and environmentally friendly catalyst and provides a clear mechanistic explanation for the removal of antibiotic pollutants in environmental remedi-ation.