TiO_2/Fe_2O_3光催化降解茜素红溶液

Photocatalytic degradation of Alizarin Red by TiO_2/Fe_2O_3

以Ti(C4H9O)4为前驱体,CH3COOH为水解抑制剂,通过溶胶-凝胶法制备了TiO_2/Fe2O3复合光催化剂。对复合光催化剂的光催化活性、光催化机理和光催化降解动力学进行了研究。研究表明,Fe2O3的引入有助于光生电子-空穴对的分离,从而提升TiO_2的光催化活性。TiO_2/Fe2O3的光催化降解动力学符合L-H动力学模型的一级反应方程模型,整个光催化反应的控制步骤为降解物在光催化剂表面的有效吸附,动力学反应级数随着降解物浓度的上升而逐渐下降。

TiO2/ Fe2O3 was prepared by sol-gel method using Ti（ C4H9O）4as precursors and CH3 COOH as depressor. The photo-degradation activity,photo-degradation mechanism and photocatalytic degradation kinetics were studied. The results showed that photo-generated electron-hole pairs could be separated effectively by doping Fe2O3,hence the photocatalytic activity of TiO2 was improved. The potocatalytic degradation kinetics of the composite catalyst complied with first order kinetics equation of L-H model,the pollutants in the photocatalyst surface adsorption was the bottleneck of the reaction,the reaction order of kinetics decreased with increase of concentrations of the pollutants.