铁掺杂氯氧化铋光芬顿催化降解水中阿特拉津的性能与机理研究  

Iron-doped bismuth oxychlorides as photo-Fenton catalysts for the degradation of atrazine in water

作　　者：许煜航 蔡泳莉 张志强 何秋香 陈志 吕健 XU Yuhang;CAI Yongli;ZHANG Zhiqiang;HE Qiuxiang;CHEN Zhi;LU Jian(Fujian Provincial Key Laboratory of Soil Environmental Health and Regulation,College of Resources and Environment,Fujian Agriculture and Forestry University,Fuzhou 350002)

机构地区：[1]福建农林大学资源与环境学院,福建省土壤环境健康与调控重点实验室,福州350002

出　　处：《环境科学学报》2023年第8期37-48,共12页Acta Scientiae Circumstantiae

基　　金：福建农林大学科技创新专项基金(No.CXZX2019073G)。

摘　　要：采用溶剂热反应制备了分级微球结构的铁掺杂氯氧化铋(Fe-BiOCl),并用于光芬顿降解阿特拉津(Atrazine,ATZ).结合多因素实验,系统地分析了以Fe-BiOCl为催化剂构建的光芬顿体系氧化降解阿特拉津的性能与机理.结果表明,当催化剂用量为0.2 g·L^(-1)、污染物浓度为20 mg·L^(-1)、H2O2浓度为6.4 mmol·L^(-1)时,Fe-BiOCl-2催化剂在120 min内降解阿特拉津的效率约为99.98%,且在较宽pH范围(3.04~6.02)内保持优异的降解效率.通过自由基猝灭实验和电子顺磁共振(EPR)测试发现,在光芬顿体系中羟基自由基(·OH)和超氧自由基(·O_(2)^(-))是反应的主要活性物种.此外,通过超高效液相色谱测定降解过程中的中间产物,提出了可能的降解路径和转化机理.Hierarchical microspheres of iron-doped bismuth oxychlorides(Fe-BiOCl)were synthesized through solvothermal reactions and used for the photo-Fenton degradation of atrazine(ATZ)in water.The performance and mechanisms of atrazine(ATZ)degradation in a photo-Fenton system constructed with Fe-BiOCl as the catalyst were systematically studied.Results showed that the ATZ degradation by Fe-BiOCl-2 reached about 99.98% in 120 min at a catalyst dosage of 0.2 g·L^(-1),pollutant concentration of 20 mg·L^(-1) and H_(2)O_(2) concentration of 6.4 mmol·L^(-1),and the excellent degradation efficiency was maintained under a relatively wide pH range(3.04~6.02).Quenching experiments and electron paramagnetic resonance(EPR)tests revealed that hydroxyl radicals(•OH)and superoxide radical(•O_(2)^(–))were the main active species responsible for atrazine degradation.In addition,intermediates of ATZ degradation were determined by Ultra Performance Liquid Chromatography(UPLC)and possible degradation pathways and transformation mechanism were proposed.

关 键 词：氯氧化铋 阿特拉津 降解 光芬顿 离子掺杂 

分 类 号：X703[环境科学与工程—环境工程]