The TiO 2/SiO 2 coating particles have been prepared by a sol gel method with Ti(OC 4H 9) 4 and SiO 2 as precursors. The IR results indicate the existence of Si—O—Ti bonds on the catalyst. The crystalline phase of coating thin films(TiO 2) was studied by XRD. The amount of TiO 2 bound to the SiO 2 was determined by spectrophotometry. The TiO 2/SiO 2 can be used repeatedly and shows a higher photocatalytic decomposition rate for dichlorvos than TiO 2.
TiO 2 powder, TiO 2/SiO 2 coated particle, and thin film reactor were prepared by sol gel process. Their morphology and structure were characterized by SEM, XRD and IR. Their effects of photocatalytic degradation for dichlorvos were studied. The Photocatalytic reactivity of thin film TiO 2 are better than that of powder TiO 2.
以 Sn Cl4· Ti( OBu) 4、氨水、乙醇为原料 ,采用活性层包覆法 ,制备出 Ti O2 / Sn O2 复合光催化剂 ,并用IR、XRD、TEM和 BET等手段对样品进行了表征 .研究其对有机磷农药敌敌畏的光催化降解效果 ,与单一半导体催化剂 Sn O2 、Ti O2 做了简单对比 .结果表明 :所制 Ti O2 / Sn O2 样品为包覆型结构 ,由锐钛矿型 Ti O2 金红石型 Sn O2 组成 ,与 Sn O2 及 Ti O2 晶体粉末相比所制 Ti O2 / Sn O2 包覆粒子光催化活性得到明显提高 .
