二氧化钛/氧化石墨烯复合光催化剂的合成

Synthesis of the titania/graphene oxide composite photocatalyst

采用水热法,以钛酸四正丁酯及氧化石墨烯(GO)为原料,在水性体系中合成了一系列具有不同GO质量分数的TiO2/GO复合光催化剂。FE-SEM分析结果表明,分散的钛酸四正丁酯以多分子层的形式吸附到氧化石墨烯的表面,最后在水热过程中转化为锐钛型TiO2粒子。当氧化石墨烯的质量分数低于3%时,产物中含有纯TiO2微球及TiO2/GO复合物;当氧化石墨烯质量分数大于5%时,产物为单纯的TiO2/GO复合物。电化学性能测试结果表明,GO复合后,TiO2电极中载流子的传输效率提高。氧化石墨烯复合量为10%时,复合光催化剂显示了对亚甲基蓝最佳的光催化活性。当复合氧化石墨烯转化为石墨烯后,其光催化活性可得到进一步大幅度的提高。

A series of titania/graphene oxide （TiO2/GO） composite photocatalysts with different mass fractions of graphene oxide were prepared in an aqueous system by hydrothermal method,using tetrabutyl titanate and graphene oxide as starting raw materials. FE-SEM results show that the TBOT is adsorbed on graphene oxide surface in multimolecular layer,and finally transformed into anatase TiO2 during hydrothermal process. When the mass fraction of graphene oxide is below 3%,the product photocatalyst consists of pure TiO2 and TiO2/GO composite. As the graphene oxide content exceeds 5%,the product consists of only TiO2/GO composite. The results of electrochemical measurement indicate that the carrier transport efficiency in TiO2 electrode increases after TiO2 is combined with GO. As the mass fraction of graphene oxide reaches 10%,the composite photocatalyst shows the highest photocatalytic activity for methylene. The photocatalytic activity can be further greatly enhanced after the bound graphene oxide is reduced to graphene.