TiO_2-ZnTBP复合催化剂的制备及其光催化性能研究

Study on preparation of TiO_2-ZnTBP composed catalyst and its photocatalytic properties

本文采用沉淀法制备了二氧化钛(TiO_2)及二氧化钛-四苯并卟啉锌(TiO_2-ZnTBP)光催化剂.通过紫外可见漫反射光谱及荧光光谱对制备的催化剂进行了光学性能的表征,结果显示TiO_2催化剂比TiO_2-ZnTBP复合催化剂呈现较大的禁带宽度,较弱的光吸收强度及较强的光生电子-空穴复合率.选用罗丹明B(RhB)为模拟污染物,在可见光下对制备的催化剂进行了光催化性能的测试,结果显示TiO_2-ZnTBP复合催化剂对15 mg/L的RhB溶液的降解率为57.5%,催化活性明显优于单一的催化剂.

TiO_2 and TiO_2-ZnTBP photocatalysts were synthesized by using the precipitation method. The optical properties of the catalysts were characterized by UV-vis diffuse reflectance spectra( UV-vis DRS) and Photoluminescence( PL) spectra. The result shows that TiO_2 catalyst possesses wider band gap,weaker absorption intensity of photo and the stronger recombination efficiency of photo-generated electron-hole. Rhodamine B( Rh B) was selected as a model pollutant for the photocatalytic activity test under visible-light irradiation to the as-prepared catalysts. As a result,the degradation efficiency of TiO_2-ZnTBP composited catalyst reaches 57. 5% for Rh B solution of 15 mg/L. The catalyst TiO_2-ZnTBP exhibits more excellent performance than that of the single catalyst in evidence.