GO/TiO_2复合催化剂的制备及其光催化降解甲基橙

Preparation of GO/TiO_2 Composit Catalysts and Photocatalytic Degradation of Methyl Orange

采用改进的Hummers法制备氧化石墨烯(GO),以异丙氧基钛为钛源,通过原位溶胶凝胶法制备了复合催化剂GO/TiO_2。通过X射线粉末衍(XRD)、扫描电镜(SEM)、透射电镜(TEM)等方法对GO及复合催化剂GO/TiO_2进行了表征,结果表明,制备的复合催化剂主晶相为锐钛矿型TiO_2,GO表面富集的TiO_2颗粒尺寸15 nm左右。以甲基橙为模型分子,测试了催化剂在紫外光下的降解性能,发现在120 min内,当GO加入量为2.1%时,GO/TiO_2复合催化剂光催化降解率高达92.7%。

The TiO2/GO composite catalyst was prepared by in-sol-gel method in the presence of graphene oxide（GO） prepared using modified Hummers method and in the presence of titanium isopropoxide.The structures of GO and TiO2/GO composite catalyst were characterized by X-ray powder diffraction（XRD）,scanning electron microscopy（SEM）,transmission electron microscopy（TEM）.The results show that the main phase of the prepared composite catalyst is anatase TiO2,and the particle size of GO surface is about 15 nm.Its behavior of photocatalytic degradation of methyl orange in aqueous solution was investigated.The results indicated that the methyl orange was degraded by 95.3% within 120 min.