影响电解4-硝基苯酚和苯醌生成转化的因素研究  

Factors Affecting the Electrochemical Degradation of 4-nitrophenol and Formation and Conversion of Benzoquinone

作　　者：董冲 魏杰 季跃飞[2] DONG Chong;WEI Jie;JI Yuefei(School of Chemistry Biology and Material Engineering,Suzhou University of Science and Technology,Suzhou 215009,China;College of Resources and Environmental Sciences,Nanjing Agricultural University,Nanjing 210095,China)

机构地区：[1]苏州科技大学化学生物与材料工程学院,江苏苏州215009 [2]南京农业大学资源与环境科学学院,江苏南京210095

出　　处：《环境科学与技术》2019年第9期156-163,共8页Environmental Science & Technology

基　　金：国家自然科学基金资助项目（21607077）

摘　　要：该研究利用热分解和电镀法制备了Ti/Sb-SnO2/α-PbO2/β-PbO2电极,并采用扫描电子显微镜、X-射线衍射仪、线性伏安法和循环伏安法对所制备电极进行形貌与性能表征。以4-硝基苯酚(4NP)为目标污染物,评估所制备电极的电催化氧化活性,同时考察4NP的转化及苯醌(BQ)的生成。通过阐明BQ生成机理及构建动力学模型,揭示4NP降解及BQ生成的动力学规律。在此基础上,探究不同电解质浓度、电流密度、4NP初始浓度和初始p H值对4NP去除率以及苯醌生成的影响。结果表明,4NP的降解与BQ的生成与操作参数密切相关。在较高浓度支持电解质(50mmol/L)、低电流密度(5mA/cm^2)、高4NP初始浓度(75μmol/L)和酸性pH(pH=5)条件下,BQ的生成浓度相对较高。总体而言,所制备的阳极材料具有较好的电催化氧化性能,可有效降解4NP及其中间产物BQ。In the present study, a Ti/Sb-SnO2/α-PbO2/β-PbO2 electrode was prepared by thermal decomposition and electroplating methods. The morphologies and performance of the electrode was characterized by scanning electronic microscopy(SEM), X-ray diffraction(XRD), linear sweep(LSV), and cyclic voltammetry(CV). The prepared electrode was then used as an anode to electrocatalytically oxidize 4-nitrophenol(4 NP) to test its activity. Both the transformation of 4 NP and the formation of benzoquinone(BQ) were investigated. The kinetic behavior of 4 NP and BQ was elucidated by studying the mechanism and kinetic modeling of BQ. Based on the above results, the effects of electrolyte concentration, current density, initial4 NP concentration, and solution pH on removal rate of 4 NP and formation of BQ was systematically evaluated. Results showed that both the transformation of 4 NP and the formation of BQ was closely related with the operational parameters. Relatively high concentration of BQ was found when higher concentration of analyte(50 mmol/L), low current density(5 mA/cm^2), high concentration of 4 NP(75 μmol/L), or acidic p H(pH=5) was applied. Overall, the anodic material prepared in this study exhibited high electrocatalytic activity for degradation of 4 NP and its intermediate BQ.

关 键 词：苯醌 二氧化铅电极 电催化氧化 4-硝基苯酚 

分 类 号：X703[环境科学与工程—环境工程]