改性金属氧化物电极用于降解邻甲酚的性能研究  

Experimental research on the degradation of o-Cresol by modified metal oxide electrodes

作　　者：王炼[1] 张钱丽[1] 王东田[1,2] 魏杰[1] 

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

出　　处：《化学研究与应用》2015年第5期612-616,共5页Chemical Research and Application

基　　金：国家自然科学基金项目(51178283)资助;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)资助

摘　　要：采用电沉积法制备了Ti/Ti O2-NTs/Pb O2、Ti/Ti O2-NTs/Ce-Pb O2、Ti/Ti O2-NTs/Fe-Pb O2三种电极,采用X射线衍射(XRD)、线性伏安扫描(LSV)、电极加速寿命等手段分别对所制备电极进行了表征,并以邻甲酚作为目标污染物评价了电极的电催化活性。研究结果表明,被Fe、Ce修饰后的两种Pb O2电极的析氧电位、稳定性、电催化活性均高于未修饰电极,且所制备的三种电极的活性催化层均为β型Pb O2,邻甲酚在三种电极上的电催化降解反应均遵守一级反应动力学规律。其中被Fe修饰的Pb O2电极是降解邻甲酚综合性能最佳的电极,该电极析氧电位为2.12 V,当电流密度为10 m A/cm2时对邻甲酚去除率为99.74%,COD去除率为60.31%,加速寿命是未修饰电极的2.6倍。Ti/TiO2-NTs/PbO2 , Ti/TiO2-NTs/Ce-PbO2 and Ti/TiO2-NTs/Fe-PbO2 electrodes were prepared by electrodeposition technique. Essential characterizations were conducted including X-ray diffraction（ XRD） ,linear sweep voltammetry（ LSV） ,and ac-celerated lifetime test,and their electric catalytic oxidation properties for pollutant degradation were tested using o-Cresol as a mod-el. Results showed that the modified electrodes not only possessed higher oxygen evolution potential but had better stability and bet-ter electrocatalytic activities compared with Ti/TiO2-NTs/PbO2. XRD？ analysis indicated that the surfaces of the prepared elec-trodes were covered with β-PbO2 . It was also found that degradation of o-Cresol followed first-order kinetics equation. The Fe doped PbO2 electrode possessed the highest OEP of 2. 12 V,over 99. 74%of o-Cresol was degraded and over 60. 31%COD removal was a-chieved as the current density was 10 mA/cm2. Besides,the service lifetime of Ti/TiO2-NTs/Fe-PbO2 electrode was 2. 6 times lon-ger than that of the Ti/TiO2-NTs/PbO2 electrode without Fe modifying.

关 键 词：电催化氧化 二氧化铅 邻甲酚 

分 类 号：O646[理学—物理化学]