负载多壁碳纳米管的多孔Ti/SnO_(2)-Sb-Ni电极电催化氧化双酚A  

Electrocatalytic Oxidation of Bisphenol A by Porous Ti/SnO_(2)-Sb-Ni Electrode Loaded with Multi-wall Carbon Nanotubes

作　　者：符远航 刘安迪 黄纬斌 唐柏彬 张进忠 FU Yuan-hang;LIU An-di;HUANG Wei-bin;TANG Bo-bin;ZHANG Jin-zhong(Chongqing Key Laboratory of Agricultural Resources and Environment,College of Resources and Environment,Southwest University,Chongqing 400715,China;Technical Center,Chongqing Customs,Chongqing 400020,China)

机构地区：[1]西南大学资源环境学院,重庆市农业资源与环境重点实验室,重庆400715 [2]重庆海关技术中心,重庆400020

出　　处：《环境科学》2022年第5期2640-2649,共10页Environmental Science

基　　金：重庆市技术创新与应用示范专项重点研发项目(cstc2018jszx-zdyfxmX0002);国家重点研发计划项目(2018YFD0800601)。

摘　　要：为发展废水中双酚A(BPA)的处理技术和保护水环境安全,采用"电沉积-热分解"法制备负载多壁碳纳米管(MWCNTs)的多孔Ti/SnO_(2)-Sb-Ni电极,研究了电极对BPA的去除能力、动力学特征和矿化效率,初步分析了BPA的降解途径.结果表明,当浸渍液中n(Sn)∶n(Sb)∶n(Ni)为100∶10∶1、ρ(MWCNTs)为0.8 g·L^(-1)时,制备的电极对BPA的去除效果最好;负载MWCNTs使得电极表面的晶体尺寸更小,可增大电极的比表面积,为电催化反应提供更多的活性位点,进而提高电极的电催化效率.当c(Na_(2)SO_(4))为10 mmol·L^(-1)、反应液初始pH为5和电流密度为50 mA·cm^(-2)时,对50 mg·L^(-1)的BPA降解60 min时去除效率达到99.76%;去除过程符合一级反应动力学方程,速率常数为0.096 min^(-1);电解120 min时,TOC去除率达到67.01%.采用液相色谱-串联质谱分析法(LC-MS/MS)鉴定BPA的降解产物,电催化降解BPA可能包括羟基化、异亚丙基C—C键断裂、脱水、脱氢和·OH氧化等途径.In order to develop technology for the treatment of bisphenol A(BPA)in wastewater and protect water environment safety,a porous Ti/SnO_(2)-Sb-Ni electrode loaded with multi-wall carbon nanotubes(MWCNTs)was prepared by the"electrodeposition-thermolysis"method.The removal ability,kinetic characteristics,and mineralization efficiency of BPA were studied using the electrode,and the degradation pathways of BPA were preliminarily analyzed.The results showed that the electrode prepared in the dipping solution containing Sn,Sb,and Ni with a mole ratio of 100∶10∶1 and 0.8 g·L^(-1) MWCNTs had the best removal effect for BPA.MWCNTs loading decreased the crystal size of the electrode surface,which could increase the specific surface area of the electrode,provide more active sites for the electrocatalytic reaction,and improve the electrocatalytic performance.When the Na_(2)SO_(4) concentration was 10 mmol·L^(-1),the initial pH of the reaction solution was 5,and the current density was 50 mA·cm^(-2),the removal efficiency of 50 mg·L^(-1) BPA reached 99.76%after 60 min degradation.The removal process conformed to the first-order reaction kinetic equation,and the rate constant was 0.096 min^(-1).The removal efficiency of TOC in the reaction solution reached 67.01%after 120 min degradation.The degradation products of BPA were identified using liquid chromatography-tandem mass spectrometry(LC-MS/MS),and the possible degradation pathways mainly included hydroxylation,the cleavage of isopropylidene C—C bond,dehydration,dehydrogenation,and·OH oxidation.

关 键 词：多壁碳纳米管 多孔钛 双酚A(BPA) 电催化氧化 降解途径 

分 类 号：X703.1[环境科学与工程—环境工程]