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以颗粒活性炭(AC)为载体,偏钛酸为钛源,采用浸渍-水热法制备负载型TiO2光催化剂,在300～800℃下热解处理.利用X射线衍射、扫描电镜、拉曼光谱和氮气吸附对催化剂样品进行了表征.以甲基橙(MO)降解为模型反应,对负载型TiO2光催化性能进行评价.结果表明,经600℃焙烧的样品具有最佳光催化性能,为锐钛矿晶型,负载于活性炭上的TiO2是由30～50nm的球型颗粒组成.负载型TiO2/AC光催化剂的光催化活性高于相同方法制备TiO2和AC混合物及商业化产品Degussa P25与活性炭混合物,光降解反应符合一级反应动力学方程.催化剂重复使用5次其光催化活性基本保持不变.
The activated carbon with activated carbon (AC) as carrier and titanium metatitanate as titanium source were prepared by impregnation-hydrothermal method and calcined at 300-800 ℃, characterized by X-ray diffraction, scanning electron microscopy, Raman spectroscopy And nitrogen adsorption were used to characterize the photocatalyst.The photocatalytic performance of the supported TiO2 was evaluated by degradation of methyl orange (MO) as a model reaction.The results showed that the sample calcined at 600 ℃ had the best photocatalytic activity Titanium dioxide crystal form, supported on activated carbon TiO2 is composed of spherical particles of 30 ~ 50nm. Photocatalytic activity of supported TiO2 / AC photocatalyst is higher than the same method to prepare TiO2 and AC mixture and commercial product Degussa P25 and activated carbon The photodegradation reaction was in accordance with the first-order reaction kinetics equation, and the photocatalytic activity of the mixture remained almost unchanged after repeated use of the catalyst for 5 times.