Abstract: TiO₂ loaded ceramic particle electrodes have been prepared by the sol-gel method,and the ceramic parti-cles before and after TiO₂ loaded is characterized by XRD and SEM. The influences of the two-dimensional electrode method and three-dimensional electrode method on the electric-catalytic degradation capabilities for target pollutant 2,4-dinitrotoluene(DNT) have been compared,and the influences of the factors,such as dosages of current density, initial pH and TiO₂ loaded ceramic particle dosages on DNT removing rate investigated. The results show that the DNT removing rate by TiO₂ loaded particles used as a three-dimensional electrode is obviously higher than that by TiO₂ loaded particles used as a two-dimensional electrode. Under the following conditions:current density is 20 mA/cm², initial pH=7.0,TiO₂/ceramic particles dosage 30 g,and reaction time 20 min,the DNT removing rate reaches 57.4%. After 120 min,the degradation can basically be accomplished. It is found through repeated trials that the stability of the TiO₂ loaded ceramic particles is comparatively high.

Key words: ceramic particle electrodes, titanium dioxide, electro-catalysis, 2,4-dinitrotoluene

摘要： 采用溶胶-凝胶法制备了负载型TiO₂陶瓷粒子电极。通过SEM和XRD对TiO₂负载前后的粒子电极进行表征，对比了二维与三维电极法对目标污染物2，4-二硝基甲苯（DNT）的电催化降解性能，考察了电流密度、初始pH、负载TiO₂粒子投加量对DNT去除率的影响。结果表明：负载TiO₂陶粒作为粒子电极的三维电极对DNT的去除率明显高于二维电极；电流密度为20 mA/cm²、初始pH为7.0、TiO₂/陶粒投加量为30 g的条件下，20 min时DNT去除率达到57.4%，120 min后基本能降解完毕。重复实验发现负载TiO₂陶粒的稳定性较高。

关键词: 陶瓷粒子电极, 二氧化钛, 电催化, 2,4-二硝基甲苯

CLC Number: 

• X703