Ti/α-PbO2/β-PbO2电极电化学降解2-氯酚

催化学报 , 2015, (7): 975-981. doi: 10.1016/S1872-2067(15)60851-8

Ti/α-PbO2/β-PbO2电极电化学降解2-氯酚

张钱丽 ^1, , 郭新艳 ^2, , 曹晓丹 ^3, , 王东田 ^4, , 魏杰 ^5,

1.苏州科技学院化学生物与材料工程学院，江苏省环境功能材料重点实验室，江苏苏州215009

2.苏州科技学院化学生物与材料工程学院，江苏省环境功能材料重点实验室，江苏苏州215009

3.苏州科技学院化学生物与材料工程学院，江苏省环境功能材料重点实验室，江苏苏州215009

4.苏州科技学院化学生物与材料工程学院，江苏省环境功能材料重点实验室，江苏苏州215009

5.苏州科技学院化学生物与材料工程学院，江苏省环境功能材料重点实验室，江苏苏州215009

基金项目: 江苏省研究生创新工程(SJLX_0580) the Six-Field Talent Peak Program of Jiangsu Province, and the Graduate Research and Innovation Plan of Jiangsu Province (SJLX_0580).基金来源:国家自然科学基金(251178283,20905055) 江苏省“六大人才高峰”计划 the National Natural Science Foundation of China(251178283,20905055)

关键词：电化学降解 , 2-氯酚 , β-PbO2电极 , α-PbO2中间层 , 动力学

Facile preparation of a Ti/α-PbO2/β-PbO2 electrode for the electrochemical degradation of 2-chlorophenol

Keywords： Electrochemical degradation , 2-Chlorophenol , β-PbO2 electrode , α-PbO2 interlayer , Kinetic analysis

采用电化学沉积法在Ti基底上制备了复合电极Ti/α-PbO2/β-PbO2,扫描电镜结果表明电极呈现由β-PbO2小晶体组成的菜花状微观形貌.所制电极在电化学降解环境污染物2-氯酚时表现出较高的电催化效率、较好的电极稳定性和较长的电极寿命.用正交实验优化了电化学降解2-氯酚的实验条件.在最优的实验条件(2-氯酚初始浓度50 mg/L,电解质0.1 mol/L Na2SO4,温度35oC,阳极电流密度20 mA/cm2)下电化学降解180 min后,2-氯酚的去除率达100%.动力学结果表明, Ti/α-PbO2/β-PbO2电极上2-氯酚的电化学氧化符合准一级动力学过程.

A Ti/α-PbO2/β-PbO2 electrode with high stability was prepared and examined toward the electro-chemical degradation of 2-chlorophenol. Scanning electron microscopy analysis revealed that Ti/α-PbO2/β-PbO2 had a cauliflower morphology comprising smallβ-PbO2 crystals. The 2-chlorophenol removal rate using the Ti/α-PbO2/β-PbO2 electrode was 100% after 180 min of electrolysis under optimal conditions, which were selected based on the orthogonal test method, i.e., initial concentration of 2-cholorophenol = 50 mg/L, concentration of Na2SO4 = 0.1 mol/L, tem-perature = 35 °C, and anode current density = 20 mA/cm2. Kinetic analyses demonstrated that the electrochemical oxidation of 2-chlorophenol on the Ti/α-PbO2/β-PbO2 electrode followed pseu-do-first order kinetics.

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