TiO_2/ACF复合材料的制备及表征

Synthesis and characterization of TiO_2/ACF composite materials

采用浸渍-提拉法和溶胶-凝胶法制备TiO2/ACF复合光催化材料,用BET、XRD和SEM等进行表征。结果表明,溶胶-凝胶法制备的复合材料由于负载了大量TiO2,其比表面积明显低于浸渍法;浸渍法制备的复合材料随着粘结剂添加量的增加,比表面积呈减小趋势。溶胶-凝胶法制备的复合材料的表面TiO2锐钛晶型较明显,浸渍-提拉法无明显的锐钛晶型。采用浸渍-提拉法制备的TiO2/ACF复合材料,TiO2以粒状负载于ACF表面;溶胶-凝胶法中TiO2在ACF表面形成一层薄膜,由于焙烧,薄膜产生裂隙,暴露出ACF,有利于吸附和催化作用的同时进行。

TiO2/ACF Photoeatalytie eomposites were prepared by dipping-eoating method and sol-gel method and they were eharaeterized by means of BET,XRD and SEM. The results show that the speeifie surfaee area of eomposite materials prepared by sol-gel method was obviously lower than that of made by the impregnation,while with the addition of the binder in the preparation of eomposite material by the im-pregnation,the speeifie surfaee area of the eomposite materials prepared deereased. XRD maps showed that the surfaee TiO2 anatase erystal of the eomposite materials prepared by the sol-gel method was more elear than that of prepared by the impregnation. SEM results show that TiO2 was loaded in the form of par-tieles when the eomposite materials were prepared by the impregnation. When using the sol-gel method, TiO2 forms a thin film in the surfaee of ACF and the interiorACF was exposed,beeause the film eraeks af-ter roasting,whieh is benefieial to the simultaneity of adsorption and photoeatalysis.