纳米SnO_2@TiO_2的制备及其光催化性能

SnCl4和 Ti(OBu)4为原料，采用活性层包覆法制备了 SnO2@TiO2包覆型复合光催化剂，并用 XPS、 IR、 XRD、 TEM和 BET等手段进行了表征，以二甲基二氯乙烯基磷酸酯（简称 DDVP）稀释液为模拟废水，考察了 SnO2@TiO2的光催化活性及降解液初始浓度对反应动力学的影响 .结果表明：包覆粒子由锐钛矿型 TiO2和金红石型 SnO2组成；与纯 SnO2、 TiO2相比， SnO2@TiO2包覆粒子的光催化活性明显提高， DDVP稀释液被光催化降解属于零级反应，但反应表观速率常数与降解液初始浓度成正比 .

Preparation and Photocatalytic Properties of Nanometer SnO_2@TiO_2

SnO2@TiO2 coated particles have been prepared with Ti(OC4H9)4 andSnO2· nH2O as precursors by coated on active surface.In order to improve the photocatalytic degradation activity of SnO2@TiO2 for DDVP,the conditions of preparation were studied and better photocatalytic activity was obtained.Its morphology and structure were characterized by XRD,SEM,TEM,XPS、 IR and BET.The result indicated:That SnO2@TiO2 is composed of nanometer ranatase TiO2 and rutile SnO2,and the photocatalytic activities of SnO2@TiO2 are better than those of SnO2 and TiO2,the apparent rate constant k of the photocatalytic degradation of DDVP is related to the initial concentration of DDVP solution.The reaction is not a simple zero-order reaction.