陶瓷粒子负载TiO2电催化氧化2,4-二硝基甲苯废水

Treatment of wastewater containing 2,4-dinitrotoluene by electro-catalytic oxidation with TiO_2 loaded ceramic particles

采用溶胶-凝胶法制备了负载型TiO_2陶瓷粒子电极。通过SEM和XRD对TiO_2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p H、负载TiO_2粒子投加量对DNT去除率的影响。结果表明:负载TiO_2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 m A/cm2、初始p H为7.0、TiO_2/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TiO_2陶粒的稳定性较高。

TiO2 loaded ceramic particle electrodes have been prepared by the sol-gel method, and the ceramic particles 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/cm^2, initial pH=7.0,TiO2/eeramie 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.