Recent progress in the preparation and application of semiconductor/graphene composite photocatalysts

Graphene is a new material with a single-layer laminar structure of carbon atoms that possesses favorable physical and chemical properties such as high electrical conductivity, high chemical stability, and large specific surface area. Combining graphene with semiconductors to form composite photocatalysts can extend its light absorption edge, improve the migration rate of charge carriers, and enhance the adsorption capacity of contaminants. The unique two-dimensional planar structure of graphene endows composite photocatalysts with many excellent properties. Herein, the properties of graphene, semiconductor, and composite photocatalysts are first introduced. The various preparation methods of semiconductor/graphene composite photocatalysts are then presented, and the mechanisms behind enhanced photocatalysis are summarized. Four typical applications of composite photocatalysts: elimination of organic pollutants, hydrogen production, organic fuel production via CO2 reduction, and photocatalytic sterilization, are described in detail. Finally, the direction of future research on semiconductor/graphene composite photocatalysts is explored. 首先分析了石墨烯和半导体光催化剂的特点, 14;以及二者复合后可能具有的优越性质, 14;接着介绍了石墨烯和半导体复合光催化剂的制备方法, 14;归纳了石墨烯增强半导体光催化的机理, 14;然后阐述了复合光催化剂在降解有机污染物、光催化分解水产氢、光催化还原CO2制有机燃料和光催化灭菌四个典型的应用, 14;最后对半导体/石墨烯复合光催化剂未来的发展趋势提出了展望.