TiO2/石墨烯复合材料的水热法合成与光催化性能

Hydrothermal preparation and photocatalytic activity ofTiO2/graphene composite

摘要:

为了提高TiO₂的光催化性能,采用水热法一步制备了TiO₂/石墨烯(TiO₂/RGO)复合物．采用XRD、FT-IR、RS、UV-Vis DRS、TEM等测试方法对其进行了表征,并研究了不同质量比的复合物在可见光下对甲基橙(MO)的光催化降解．结果表明:在TiO₂/RGO复合物中,TiO₂以10 nm左右的颗粒均匀地分散在石墨烯层上;与在同等条件下制备的TiO₂相比,TiO₂/RGO复合物在可见光区吸收明显增强,吸收边缘红移了20 nm;质量比为1∶0.005的TiO₂/RGO复合物,2 h内的降解率达到74.79％．可见将石墨烯与TiO₂复合,能够有效地提高TiO₂的可见光催化性能．

Abstract:

To improve the photocatalytic performance of TiO₂, we prepared TiO₂/graphene composite (TiO₂/RGO) with a one-step hydrothermal method. The products were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), Raman spectra (RS), ultraviolet-visible diffuse reflectance spectroscopy (UV-Vis DRS), transmission electron microscopy (TEM). The photocatalytic activities of the composites prepared with different mass ratio were evaluated using the photocatalytic degradation of methyl orange under visible light. The results showed that TiO₂ particles with an average size of 10 nm were dispersed on the surface of graphene sheets uniformly in the TiO₂/RGO composite. Compared with TiO₂ obtained under the same conditions, the absorption of TiO₂/RGO composite in the visible region was significantly enhanced and the absorption edge was showed a red shift of 20 nm. The photocatalytic degradation efficiency of the composite prepared with 1∶0.005 of mass ratio was about 74.79% after 2 h irradiation. The visible light catalytic performance of TiO₂ to incorporate graphene into TiO₂ can be effectively improved.