可见光响应的TiO2/石墨烯复合材料的制备及其光电催化性能∗

摘要

对 Hummers 方法进行改进,制备出氧化石墨烯。采用氧化石墨烯和 Ti(SO4)2作为初始反应物,利用Ti(SO4)2水解,在氧化石墨烯层间成核生长纳米TiO2颗粒,制得TiO2/氧化石墨烯复合材料,再通过水合肼进行还原,制得 TiO2/石墨烯复合材料。通过XRD、FE-SEM、HR-TEM、TGA、UV-Vis、BET 和电化学性能测试等测试手段对复合材料进行表征。以复合材料为工作电极,铂电极为对电极,饱和甘汞电极为参比电极,在可见光照射(λ＞420 nm)下,通过光电催化降解含偶氮化学健的酸性红 B,对复合材料的催化性能进行研究。结果表明,复合材料对可见光响应良好；在外加电极电压的条件下,复合材料的催化活性得到进一步增强。%Graphene oxide was prepared by the modified Hummers method.Using the graphene oxide and Ti (SO4 )2 as the initial reactants,TiO2/graphene oxide composite was prepared by nucleation growth of TiO2 nan-oparticles in the graphene oxide interlayer after Ti(SO4 )2 hydrolysis.Then,TiO2/graphene composite was pre-pared through reduction by hydrazine hydrate.The composite was characterized by XRD,FE-SEM,HR-TEM, TGA,UV-Vis,TBE and the electrochemical measurements.Under visible light irradiation(λ>420 nm),using the composite as working electrode,platinum electrode as counter electrode,and saturated calomel electrode as reference electrode,the photoelectrocatalytic activity of the composite for the decomposition of acid red B which contains azo chemical health was studied.The results showed that the composite has a good response to the visi-ble light,and the catalytic activity of the composite was increased under the condition of increased electrode voltage.