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以氧化石墨烯和Ti(SO4)2为初始反应物,通过不同的反应途径制得两种TiO2/石墨烯复合材料。途径一是利用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,再通过还原反应,制得TiO2/石墨烯复合材料。途径二是将氧化石墨烯还原制得石墨烯,再利用Ti(SO4)2水解,在石墨烯层间成核生长而制得TiO2/石墨烯复合材料。通过XRD、FE-SEM、HR-TEM、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,在可见光照射(λ>420nm)和外加电极电压的条件下,通过光电催化降解酸性红B对复合材料的催化性能进行研究。结果表明,(1)不同的反应途径对复合材料的多方面性质有较大影响;(2)途径一所制得的复合材料具有更加优良的光电催化性能。
Two kinds of TiO2 / graphene composites were prepared by different reaction routes using graphene oxide and Ti (SO4) 2 as initial reactants. The first approach is to use Ti (SO4) 2 hydrolysis to nucleate and grow nano-TiO2 particles between graphene oxide layers to prepare TiO2 / graphene oxide composite materials, and then obtain TiO2 / graphene composite materials through reduction reaction. The second approach is to obtain graphene by reduction of graphene oxide and then use Ti (SO4) 2 hydrolysis to produce a TiO2 / graphene composite by nucleation and growth between layers of graphene. The composites were characterized by XRD, FE-SEM, HR-TEM, BET and electrochemical performance tests. The composite material was used as working electrode, and the catalytic performance of the composite was studied by photoelectrocatalytic degradation of acid red B under visible light irradiation (λ> 420nm) and applied electrode voltage. The results show that (1) the different reaction routes have a great influence on the multi-dimensional properties of the composites; (2) the prepared composite has more excellent photocatalytic activity.