高性能二氧化铅电极制备及降解邻甲酚  

Preparation of high-performance PbO_2 electrode and o-cresol degradation

作　　者：王炼[1] 张钱丽[1] 王东田[1,2] 魏杰[1] 

机构地区：[1]苏州科技学院化学生物与材料工程学院,苏州215009 [2]江苏省环境功能材料重点实验室,苏州215009

出　　处：《环境工程学报》2016年第4期1657-1664,共8页Chinese Journal of Environmental Engineering

基　　金：国家自然科学基金资助项目(51178283);江苏省"六大人才高峰"资助项目;苏州科技学院研究生科研创新计划项目(SKCX13S-054)

摘　　要：为了处理难生物降解有机污染物,制备了聚乙二醇(PEG)改性Ti/Sb-Sn O_2/PEG-Pb O_2电极,分别用线性伏安扫描(LSV)、扫描电镜(SEM)、X射线衍射(XRD)、计时电流、电极加速寿命等方法对电极性能进行了表征,并以邻甲酚为目标污染物,考察了PEG改性Pb O2电极的电催化氧化性能。研究结果表明,掺杂PEG后,电极的电催化活性以及稳定性均得到提高,PEG最佳掺杂量为9 g/L。在此条件下制备的Pb O_2电极,其析氧电位为2.48 V,强化电极寿命为114 h,是未修饰电极的3.35倍。利用该电极降解邻甲酚模拟废水,邻甲酚去除率随着其初始浓度增加而下降,当初始邻甲酚浓度为100mg/L、溶液初始p H=10、电流密度为10 m A/cm^2时,1.5 h邻甲酚去除率为100%。邻甲酚的降解反应是·OH参与的间接氧化反应,且遵循一级动力学规律。For the electrochemical degradation of biorefractory organics,novel polyethylene glycol（ PEG）-doped Ti / Sb-Sn O_2/ PEG-Pb O_2 electrodes were prepared and characterized by linear sweep voltammetry（ LSV）,scanning electron microscopy（ SEM）,X-ray diffraction（ XRD）,chronoamperometric experiments,and accelerated lifetime tests. It was shown that the PEG-doped Pb O_2 electrode exhibited high electrocatalytic activity and good stability with the optimal PEG doping concentration of 9 g / L. The oxygen evolution potential of the prepared electrode reached 2. 48 V,and its lifetime was 114 h,which was 3. 35 times longer than that of the unmodified one. The electrochemical degradation performance of the prepared electrodes was investigated using o-cresol as a model. The percentage of o-cresol removal decreased with increasing initial o-cresol concentration. The removal efficiency of o-cresol reached 100% under the conditions of initial o-cresol concentration of 100 mg / L,p H of10. 0,and current density of 10 m A / cm^2 for 1. 5 h. The cyclic voltammetric（ CV） test showed that the degradation of o-cresol on Ti / Sb-Sn O_2/ PEG-Pb O_2 was achieved via electrochemical oxidation mediated by ·OH,and kinetic analyses indicated that the degradation of o-cresol followed first-order reaction kinetics.

关 键 词：电催化氧化 二氧化铅 邻甲酚 

分 类 号：X703.1[环境科学与工程—环境工程]