焙烧条件对热聚合法制备石墨相氮化碳光催化性能的影响及其机理

以三聚氰胺、硝酸为原料,采用热聚合法制备石墨相氮化碳(g-C3N4),研究了不同焙烧温度对石墨相氮化碳光催化性能的影响.利用扫描电镜(SEM)、X射线衍射(XRD)、X射线光电子能谱仪(XPS)、傅里叶变换红外光谱(FT-IR)、紫外-可见漫反射(UV-Vis DRS)以及光致发光光谱(PL)等技术对石墨相氮化碳样品的...

EFFECTS OF CALCINATION CONDITION ON PHOTOCATALYTIC PROPERTY OF G-C3N4 PREPARED THROUGH THERMAL POLYMERIZATION AND ITS MACHANISM

In this paper, graphite phase carbon nitride was prepared by thermal polymerization process using melamine and dilute nitric acid as raw materials. Effects of calcination temperature on the photocatalytic activity to degradation of Rhodamine B (RhB) of the graphite phase carbon nitride were researched. Their morphologies, crystal structure, chemical composition of as prepared graphite phase carbon nitride were characterized by means of SEM, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS),Fourier transform infrared spectroscopy(FT-IR), UV-Vis diffuse reflectance spectroscopy (UV-Vis DRS) and photoluminescence spectra (PL). The photocatalytic performance of g-C₃N₄ was tested by photo-decomposition of RhB and the experiment result manifested that the prepared graphite phase carbon nitride samples showed best photocatalyst property when the calcination temperature was 550℃. The degradation rate of RhB in 50 min was about 91.7% after 50 min irradiation under visible light with the dosage of photocatalyst at 0.04 g. Appropriate calcination temperature would be beneficial to enhance light absorption capacity and promote the separation of photogenerated electrons (e-) and holes (h+).