以二氰二胺为原料,采用热缩聚法制备g-C_3N_4光催化剂,再用98%的H_2SO_4溶液和K2Cr2O7固体两者混合的强氧化剂制备化学氧化g-C_3N_4。通过X射线衍射光谱(XRD)、紫外-可见(UV-Vis)光谱、傅里叶变换红外(FT-IR)、荧光(PL)光谱等分析手段对制备的催化剂进行了表征。以罗丹明B(Rh B)为模拟污染物,对样品的光催化性能进行了研究。研究结果表明:在550℃下煅烧二氰二胺制备的g-C_3N_4具有较高的催化活性,罗丹明B光反应1h降解率达到50.4%,而化学氧化g-C_3N_4对罗丹明B的降解率达到93.42%。
The graphitie carbon nitride (g -C3N4) photocatalysts are prepared using dicyandiamide as precur- sor by thermal condensation, and then 98% of the HzSO4 solution and K2Cr2O7 solid mixture of strong oxidizing agent, so that the chemical oxidation g - C3 N4 photocatalysts are synthesized. X - ray diffraction ( XRD), ultraviolet - visible ( UV - Vis) spectroscopy, Fouriertransform infrared ( FT - IR) spectroscopy, and photolu- minescence (PL) spectrum are used to identify the changes of catalysts in the characteristics. Using Rhoda- mine B as simulated pollutants, the photocatalytic properties of the samples are studied. The research results