TiO_2/石墨烯复合材料的合成及光催化分解水产氢活性

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(TiO_2)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,TiO_2/石墨烯复合光催化材料的光催化分解水产氢速率为8.6 μmol·h~(-1),远大于同条件下商业P25的产氢速率(4.5 μmol·h~(-1)),光解水产氢活性提高了近2倍;可见光下光照3 h,TiO_2/烯复合材料的光催化分解水产氢量约为0.2 μmol.%Grapheue 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 (TiO_2/GSs) was synthesized using tetrabutyl titanate and GSs as the starting materials by a sol-gel method. The photocatalytic activity for hydrogen evolution of TiO_2/GSs was evaluated from water photo-splitting under ultraviolet-visible (UV-Vis) and visible light illumination, respectively. The results showed that the as-prepared TiO_2/GSs composite illumination for the as-prepared TiO_2/GSs composite.