一种以还原氧化石墨烯为电子中继体的复合光催化剂的合成及光催化性能研究

Synthesis and Photocatalytic Properties of A Composite Photocatalyst with Reduced Graphene Oxide as Electron Mediator

本文构建了一种以还原氧化石墨烯(RGO)为电子中继体的复合光催化体系Pt-RGO/ZnIn2S4-CoPi/BiVO4,并分别利用若丹明B(RhB)的脱色和光催化分解水测试其催化性能。在RhB的光催化脱色实验中,反应3h后,溶液中RhB的脱色率高达99.89%。在光催化分解水的过程中,反应5h之后,复合催化剂体系产H2量达到359.6μmol,产氧量达到196.3μmol。探讨了复合光催化剂体系的工作机理,发现其卓越的光催化水处理效能主要缘于RGO作为电子中继体促进了光生电子在两个复合单体之间的传导,从而提高了系统的光催化性能。

In this paper,a composite photocatalytic system Pt-RGO/ZnIn2S4-CoPi/BiVO4 with reduced graphene oxide(RGO)as the electronic relay body was constructed,and its catalytic performance was evaluated by the decolorization of rhodamine B(RhB)and the photocatalytic water decomposition test.In the experiment of photocatalytic removal of RhB,the decolorization rate of RhB reached 99.89%after 3 h.In the process of photocatalytic water splitting,after 5 h,the amount of H2 and O2 over the composite catalyst system reached 359.6μmol and 196.3μmol,respectively.Based on the above data,the working mechanism of the composite photocatalyst system is discussed.It is found that the supper photocatalytic water treatment efficiency is mainly due to RGO acting as a good electron mediator.The main reason is that RGO,as an electron relay body,promotes the conduction of photogenerated electrons between two composite monomers,thus improving the photocatalytic performance of the system.