中文摘要：

利用石墨粉根据Hummers氧化法制得氧化石墨,并进一步还原得到石墨烯。采用溶胶-凝胶法以钛酸四丁酯和石墨烯为起始材料制备了二氧化钛（TiO2）和石墨烯的复合光催化材料。研究了该复合材料在紫外-可见光以及可见光条件下的光催化分解水制氢活性。结果表明,紫外-可见光照射下,TiO2/石墨烯复合光催化材料的光催化分解水产氢速率为8.6μmol·h^-1,远大于同条件下商业P25的产氢速率（4.5μmol·h^-1）,光解水产氢活性提高了近2倍;可见光下光照3 h,TiO2/石墨烯复合材料的光催化分解水产氢量约为0.2μmol。

英文摘要：

Graphene sheets （GSs） were prepared by reduction of graphite oxide （GO）, which was obtained from oxidation of graphite powder by Hummers＇ method. The composite of titanium dioxide/graphene sheets （TiO2/GSs） was synthesized using tetrabutyl titanate and GSs as the starting materials by a sol-gel method. The photocatalytic activity for hydrogen evolution of TiO2/GSs was evaluated from water photo-splitting under ultraviolet-visible （UV-Vis） and visible light illumination, respectively. The results showed that the as-prepared TiO2/GSs composite exhibited a hydrogen evolution rate of 8.6μmol·h^-1 under UV-Vis light irradiation, nearly two times larger than that of P25 （4.5 μmol·h^-1）. Total hydrogen amount about 0.2 μmol was observed within 3 h under visible light illumination for the as-prepared TiO2/GSs composite.