β-PbO_2电极电催化降解水体中对硝基苯酚  

Electrocatalytic degradation of p-nitrophenol in aqueous solution by β-PbO_2 electrode

作　　者：胡彩菊[1] 朱承驻[1] 陆军[2] 庆承松[1] 陈天虎[1] 

机构地区：[1]合肥工业大学资源与环境工程学院,安徽合肥230009 [2]合肥工业大学分析测试中心,安徽合肥230009

出　　处：《合肥工业大学学报（自然科学版）》2013年第7期849-854,865,共7页Journal of Hefei University of Technology：Natural Science

基　　金：国家自然科学基金资助项目(41072035;41072036)

摘　　要：文章以电沉积法制备的钛基β-PbO2电极为阳极,钛板为阴极,以对硝基苯酚模拟废水为对象,考察了支持电解质种类、电解质浓度、电解时间、对硝基苯酚初始质量浓度、外加电压、电极板间距及溶液初始pH值等因素对β-PbO2电催化降解对硝基苯酚的影响,并对β-PbO2电极电催化降解对硝基苯酚过程的机理及动力学进行初步探讨。研究结果表明:在以NaCl为支持电解质,电解质投加量为0.025mol/L,对硝基苯酚初始质量浓度60mg/L,外加电压为20V,极板间距7cm,溶液初始pH值为5的条件下,电解1.5h后,对硝基苯酚的去除率为99%,CODcr去除率可达87.5%。Ti-base β-PbO2 electrodes as anode were successfully prepared using electro-deposition. The electroeatalytic oxidation of p -nitrophenol was carried out with a titanium plate cathode in aqueous solution. Both the β-NP and CODcr removal efficiency were investigated considering different supporting electrolyte, electrolysis time, initial p-nitrophenol concentration, initial pH value and electrode spacing, respectively. The mechanism and kinetics of electrocatalytie degradation of p -NP by βPbO2 eletrode were analyzed. The results showed that when the β-nitrophenol was 60 mg/L, the applied voltage was 20 V, the electrode spacing was 7 cm, the initial pH value was 5, the supporting electrolyte of NaCl was 0. 025 mol/L and the electrolysis time was 1.5 h, the removal efficiency of β -NP and CODcr could beup to 99% and 87.5%, respectively.

关 键 词：β-PbO2电极 电化学氧化 对硝基苯酚 自由基 

分 类 号：X703.1[环境科学与工程—环境工程]