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采用微波溶剂热法和简单的固相热分解反应成功制备了g-C_3N_4/BiFeO_3/BiFeO_3复合可见光催化剂,利用扫描电子显微镜(SEM)、X射线衍射光谱仪(XRD)、傅里叶变换红外光谱仪(FT-IR)和紫外可见漫反射光谱(UV-Vis DRS)等技术对所制备的催化剂进行了表征。结果显示,复合可见光催化剂保持BiFeO_3的钙钛矿结构,g-C_3N_4/BiFeO_3只是复合在BiFeO_3的表面,没有改变BiFeO_3的晶体结构;UV-Vis DRS测试显示,g-C_3N_4/BiFeO_3/BiFeO_3的吸收带边发生了红移,可见光吸收能力得到提升。g-C_3N_4/BiFeO_3和BiFeO_3形成的异质结结构,很好地抑制了光生电子-空穴对的复合率;以罗丹明B为目标降解物,研究了催化剂的可见光催化性能。结果表明,g-C_3N_4/BiFeO_3和BiFeO_3的复合可以显著地提高催化剂的可见光催化活性;在g-C_3N_4/BiFeO_3的掺入量为15%时,g-C_3N_4/BiFeO_3/BiFeO_3对罗丹明B的可见光催化降解率可以达到93.62%。
The composite photocatalyst g-C_3N_4 / BiFeO_3 / BiFeO_3 was successfully prepared by microwave solvothermal method and simple solid-state thermal decomposition reaction. The photocatalysts were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD) and Fourier transform infrared spectroscopy FT-IR and UV-Vis DRS techniques were used to characterize the prepared catalysts. The results show that the composite visible light photocatalyst maintains the perovskite structure of BiFeO_3, while the g-C_3N_4 / BiFeO_3 only composites on the surface of BiFeO_3, which does not change the crystal structure of BiFeO_3. The UV-Vis DRS test shows that the absorption band of g_C_3N_4 / BiFeO_3 / BiFeO_3 A red shift occurred while the visible light absorption ability was improved. g-C_3N_4 / BiFeO_3 and BiFeO_3 formed by the heterojunction structure, good inhibition of the photo-generated electron-hole recombination rate; Rhodamine B as the target degradation products, the catalyst of the visible light catalytic properties. The results showed that the composite of g-C_3N_4 / BiFeO_3 and BiFeO_3 can significantly improve the visible light photocatalytic activity of the catalyst. When the content of g-C_3N_4 / BiFeO_3 is 15%, the visible light of rhodamine B by g-C_3N_4 / BiFeO_3 / BiFeO_3 Catalytic degradation rate can reach 93.62%.