以高温热聚合三聚氰胺得到的石墨相氮化碳(g-C3N4)为前驱体,通过简单的共沉淀法合成了Fe3O4/g-C3N4磁性复合材料。通过X射线衍射(XRD)、扫描电镜(SEM)、傅里叶变换红外光谱(FT-IR)和紫外-可见漫反射光谱分析(UV-Vis DRS)等手段对材料进行表征,并考察了该复合材料在可见光条件下对有机染料酸性橙7的降解效率。结果表明:Fe3O4/g-C3N4复合材料由片状结构g-C3N4和絮状物质Fe3O4颗粒组成,Fe3O4/g-C3N4复合材料不仅保持了在紫外区的强吸收,而且在可见光区吸收波长范围更大;Fe3O4/g-C3N4为16∶1时的复合材料表现出最高效的光催化活性和良好的稳定性,其原因是Fe3O4和g-C3N4之间的协同作用,促进了光生电荷相互分离。
Fe3O4/g-C3N4 magnetic composites were synthesized by simple coprecipitation method,using g-C3N4 prepared from high temperature thermal polymerization of melamine as precursor.The as-prepared samples were characterized by X-ray diffraction (XRD),scanning electron microscope (SEM),fourier transform infrared spectroscopy (FT-IR) and ultraviolet-visible diffuse reflection spectrum analyzer (UV-Vis DRS) and other methods.And the degradation efficiency of acid orange 7 under visible light was investigated.The results shown that Fe3O4/g-C3N4 were composed of plate-like structure g-C3N4 and cotton-like Fe3O4 particles.Fe3O4/g-C3N4 not only maintained strong absorption in the ultraviolet region,but also had a wider absorption wavelength range in the visible region.16∶1 Fe3O4/g-C3N4 composites exhibited the highest photocatalytic activity and good stability.The reason was that the synergistic effect between Fe3O4 and g-C3N4 promoted the separation of photogenerated charges.
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