Preparation And Photocatalytic Activity Of Nano-heterostructure On Graphene

Photocatalytic degradation of organic pollutants is a new approach to removeorganic pollutants, and it has attracted increasingly focus for researchers. The mostcommonly used photocatalyst is the semiconductor photocatalyst. TiO₂received muchattention particularly among all the semiconductor photocatalyst. But the conventionalphotacatalyst cannot satisfy all the needs for an effective visible photocatylic reaction,which limited its application in many fields. Semiconductor/semiconductorheterogeneous material is composed of two different semiconductors, which canovercome the drawbacks of conventional semiconductor, such as: low quantum yieldand limited utilization rate of visible light. Nano-heterogeneous material both has theadvantage of nanomaterials and heterostructure, and it becomes a new hotpot inphotocatalytic field. Graphene shows excellent mechanical performance, electricalperformance and large theorical specifical surface area. So, graphene can serve as a newbasal material for catalyst. It has been found that graphene can facilitate thephotocatalytic reaction.We study the preparation of graphene oxide （GO） with the modified Hummersmethod, and discuss the affect of the temperature and time of intermediate temperature.It shows the proper reaction condition is at certain temperature （below50℃） for8¹2h.We use glucose, ascorbic acid, NaBH4and high temperature reduction method toprepare graphene. The prepared graphene is used for follow-up contrast experiment.We study the parparation and photocatalytic properties of CdTe-TiO₂-graphene.The photocatalytic properties of CdTe-TiO₂-graphene composites is prior to the pureTiO₂, but weaker than that of CdTe. Graphene shows no obvious photocatalytic activity,but it can be used as a good absorbent to remove the organic pollutant.We study the parparation and photocatalytic properties of Cu2O-TiO₂-graphenewith the reduction of glucose and ascorbic acid. Different amount of Cu2O among thecomposites can affect the properties of Cu2O-TiO₂-graphene composites. With theincrease of the amount of Cu2O, the photocatalytic properties of Cu2O-TiO₂-graphenegragually intensified. As for the two reduction method, glucose method shows muchmore advantages. The most appropriate recipe is the Cu2O（67%）-TiO₂-grapheneprepared by glucose method.