改性钛基PbO2电极对有机污染物的降解性能——以甲基橙和4-硝基苯酚为例

采用溶胶-凝胶法和电化学沉积法制备了Ti/SnO₂-Sb/Ce-PbO₂电极，并对制备的电极表面形貌、晶体结构和电化学性能进行了分析，进一步探究了该电极对甲基橙和4-硝基苯酚的降解效果.结果表明，由Ce改性的Ti/SnO₂-Sb/Ce-PbO₂电极具有稳定的结构和更好的电化学活性，析氧电位可达1.56V.在电极间距为2cm，电流密度为30mA/cm²，目标污染物的浓度为100mg/L，电解质浓度为0.10mol/L时，作用120min后，Ti/SnO₂-Sb/Ce-PbO₂电极对甲基橙和4-硝基苯酚的降解率分别达到了99.59%和96.16%，180min后TOC的去除率分别达到了56.71%和54.87%，研究结果为该电极降解有机污染物提供了一定的技术支撑.

Degradation of organic pollutants by modified titanium based PbO2 electrode: Taking methyl orange and 4-nitrophenol as examples

Ti/SnO₂-Sb/Ce-PbO₂ electrode was prepared by sol-gel method and electrochemical deposition method. The surface morphology, crystal structure and electrochemical performance of the prepared electrode were analysed, and the degradation effect of the electrode on methyl orange and 4-nitrophenol was further investigated. The results showed that the Ti/SnO₂-Sb/Ce-PbO₂ electrode has a more stable structure, has a better electrochemical activity compared with other electrodes, and that its oxygen evolution potential can reach 1.56V. The optimal operating conditions were set at an interelectrode spacing of 2cm, at a current density of 30mA/cm², at a concentration of the target pollutant of 100mg/L, and at an electrolyte concentration of 0.10mol/L. As electrolysis time reached 120min with the Ti/SnO₂-Sb/Ce-PbO₂ electrode, the removal efficiency of methyl orange and 4-nitrophenol reached 99.59% and 96.16%, respectively. After 180min of degradation, the TOC removal efficiency reached 56.71% and 54.87%, respectively. The results provide a technical support for the Ti/SnO₂-Sb/Ce-PbO₂ electrode to degrade organic pollutants.