The Preparation And Photocatalytic Performance Research Of Graphene-Based Nano-Photocatalysts

Photocatalytic technology is that it can convert and store the solar energy,and it has great potential in the field of environment and energy such as photocatalytic water splitting for producing hydrogen and degrading pollutants.For the moment,a large number of semiconductor photocatalysts have been developed for solving the energy and environment problems via harvesting solar energy.However,most of these photocatalysts can only respond to ultraviolet or visible light,and there is insufficient utilization of near infrared light in solar energy spectrum.In addition,their photocatalytic efficiency cannot meet large-scale application.The design and preparation of graphene-based semiconductor photocatalysts provid a new method for solving this problem.Based on the advantages of graphene with large specific surface area and good conductivity,this paper makes full use of graphene features,we report the preparation of the nanocomposite of Cu2(OH)PO4 and reduced graphene oxide(Cu2(OH)PO4/rGO).Not only graphene can enhance the graphene of Cu2(OH)PO4 for infrared light and provide a large number of reactive sites in photocatalysis,but also it can promote the separation of photon-generated carrier,resulting in enhanced photocatalytic activity.Also,take advantage of the structure characteristics of Cu2(OH)PO4,the produced Cu?sites in photocatalysis can react with H2O2 to effectively promote the generation of highly active hydroxyl radicals(.OH),it can further enhance the photocatalytic activity.For the synthesized heterojunction nanostructures of bismuth nanoparticles and graphene(c-BGHs),it has strong interaction between the graphene and bismuth suboxide on the surface of bismuth nanoparticies during calcination,resulting in high-quality heterojunction.It found that not only graphene has the above mentioned functions,but also graphene can inhibit the agglomeration of bismuth nanoparticies during the calcination process.Furthermore photocatalytic degradation experiments demonstrate c-BGHs can respond to ultraviolet to near-infrared light and has strong photocatalytic performance,attributing to the smaller band gap.In addition,Depending on the alignment of the energy levels and arrest test,we put forward the photocatalysis mechanism of c-BGHs.The characterization,photocatalytic performance and stability of c-BGHs indicate that graphene-based semiconductor photocatalysts reveal enhanced photocatalytic performance than single photocatalyst,which provide a new strategy to search stable and effective photocatalysts.