TiO_2/SiO_2复合物与H_2O_2对有机染料的协同光催化降解作用研究

Photodegradation of Organic Dye Based on the Synergetic Catalytic Effect of TiO_2/SiO_2 and H_2O_2

采用溶胶凝胶法制备了SiO2含量较高的TiO2/SiO2复合氧化物,并采用SEM、XRD、FTIR等手段进行了表征。测试结果表明,制备得到的复合物是由TiO2和SiO2纳米颗粒所组成的具有多孔网络结构的聚集体,钛氧基团通过Ti-O-Si键固定于SiO2基体中,TiO2主要以无定型态存在。实验发现,在紫外光作用下,TiO2/SiO2复合物与H2O2协同作用,对有机染料曙红B溶液具有较高的催化降解效率。复合物对曙红B的光催化降解符合一级反应动力学方程。

TiO2/SiO2 composites containing high content of SiO2 were prepared based on sol-gel method and characterized by SEM, FTIR and XRD. Characterization resulted reveals that the as-synthesized composite was an aggregate composed of TiO2 and SiO2 nanoparticles and owned nanoporous network. Amorphous titania binds to SiO2 matrix through Ti-O-Si bonds. The composite showed good photodegradation performance towards organic dyes after treated with hydrogen peroxide. Kinetic results revealed that the photodegradation of eosin B obey to first-order equation and the decolorization rate of organic dye had been significantly accelerated based on the synergetic catalytic effect of TiO2/SiO2 composite and H2O2.