Ce-TiO2/硅藻土的制备、表征及其光催化活性
来源期刊：中国有色金属学报2007年第5期
论文作者：雷波 徐悦华 郭来秋 罗海燕
文章页码：795 - 795
关键词：TiO2；硅藻土；Ce掺杂；TiO2/硅藻土；光催化
Key words：TiO2; kieselguhr; Ce doping; TiO2./kieselguhr; photocatalysis
摘 要：
以硅藻土(KL)为载体，用溶胶-凝胶法将铈掺杂二氧化钛包覆在硅藻土上(Ce-TiO2/KL)。采用XRD、DRS、SEM对其进行表征，以250 Ｗ高压汞灯作光源，甲醛作为反应底物表征其光催化活性。结果表明：Ce-TiO2包覆在硅藻土颗粒上，并能在较高的煅烧温度(500 ℃)范围内保持锐钛矿晶体结构；随着铈掺杂含量的提高，J2Ce-TiO2/KL对可见光的吸收明显增强，有利于充分利用太阳光。由此可见，TiO2固定在硅藻土上时，铈掺杂不仅提高了其活性，还导致其激发波长红移，还有利于回收利用。
Abstract: Ce-TiO2/kieselguhr photocatalysts were prepared by sol-gel method under alkalescent conditions, and characterized by X-ray diffractrometry, scanning electron microscopy and DRS. The photocatalytic degradation of formaldehyde was chosen as a model reaction to evaluate the photocatalytic activities of the composite photocatalysts irradiated by 250 W high-pressure mercury lamp. The results show Ce-TiO2 coating on kieselguhr. The crystalline phase of titanium dioxide is still only anatase in wide range of temperature. The light absorption in visible region increases with increasing Ce-doping content in J2Ce-TiO2/kieselguhr, so it is beneficial to use sun’s ray. When Ce-TiO2 is immobilized on kieselguhr, Ce-doping not only enhances its photocatalytic activity, but also extends its respond wavelength. Ce-TiO2/KL is also easy to be recycled and reused.
