响应面法优化C改性TiO2磁性光催化剂的制备及其光降解甲基橙

Preparation of C-TiO2@Fe3O4/AC magnetic photocatalyst optimized by response surface method and MO photodegradation

采用水解-共沉淀法将C改性TiO2负载于Fe3O4磁性活性炭上,制备出具有磁性特性的C改性TiO2光催化剂,并通过响应面分析法,确定了其制备最佳条件。模拟太阳光采用该催化剂光降解模拟污染物甲基橙溶液,最佳条件下反应30min,50mg/L甲基橙降解率可达97.1%,高出商用TiO2光催化剂去除率25.1%。同时,该催化剂也具有较为优异的可见光激发降解效果,在400~800nm可见光辐照条件下,光催化降解甲基橙降解率可达64.7%,效果高出商用TiO2光催化剂2.09倍。本研究为光催化降解有机污染物提供了新的催化剂合成思路和途径。

A novel magnetic photocatalyst(C modified TiO2loading on magnetic Fe3O4actived carbon,C-TiO2@Fe3O4/AC)was prepared by hydrolysis-coprecipitation method.The response surface method was used to obtain the optimal conditions of catalyst synthesis.The methyl orange(MO)was selected as the model pollutant and C-TiO2@Fe3O4/AC was utilized in photo degradation with simulated sunlight light.At the optimal conditions,50mg·L^-1 MO was degraded up to 97.1%for 30min reaction.The MO degradation rate was 25.1%higher than the commercial TiO2 catalyst.Furthermore,C-TiO2@Fe3O4/AC had excellent visible light catalytic effect.In the condition of 400~800nm visible light irradiation,MO degradation rate also can reach 64.7%which was 2.09times higher than that of the commercial TiO2light catalyst.This study provided a new approach for photocatalytic degradation of organic pollutants.