g-C3N4/NiO复合材料的制备及可见光催化性能研究

Synthesis of g-C3N4/NiO composites and their photocatalytic capability under visible light

以三聚氰胺为前驱体,ZnCl2/NiCl2熔盐为反应介质,制备了g-C3N4/NiO光催化剂。利用TEM、XRD和FT-IR等手段对复合光催化剂的结构和性能进行表征;以可溶性染料罗丹明B为目标降解物,考察其光催化降解活性。结果表明,NiO与g-C3N4形成了异质结,增强了g-C3N4对可见光的利用能力,促进了光生电子和空穴的分离,g-C3N4/NiO的光催化降解性能显著提高,其中g-C3N4/NiO(6)的降解性能最佳。

g-C3N4/NiO photocatalysts were prepared by molten salt method and used melamine as precursor and ZnCl2/NiCl2 salt as reaction medium,respectively.The structure and properties of the photocatalysts were characterized by TEM,XRD and FT-IR.Using a xenon lamp as a light source and soluble dye RhB as the target degradation material,the photocatalytic degradation capability of g-C3N4/NiO was investigated.The results demonstrated that the formation of heterojunction between g-C3N4 and NiO resulted in the enhanced light absorption and efficient charge separation and transfer,thus improving photocatalytic activity.In addition,the photocatalytic degradation performance of g-C3N4/NiO was higher than that of g-C3N4,and g-C3N4/NiO(6)achieved the highest photocatalytic activity.