表面氟化g-C_(3)N_(4)光催化降解罗丹明B的性能研究

Reinforcing the Photocatalytic Degradation of Rhodamine B Through the Surface Fluorination of g-C_(3)N_(4)

以三聚氰胺为前驱体制备g-C_(3)N_(4)(缩写为CN),采用不同体积的氢氟酸(HF)对CN进行表面氟化。通过X-射线粉末衍射(XRD)、冷场发射扫描电子显微镜(SEM)、傅里叶变换红外光谱(FT-IR)、紫外-可见漫反射吸收(UV-Vis DRS)等对样品的结构、形貌以及光电化学性质进行分析测试。在紫外光下降解罗丹明B(RhB),探究表面氟化对CN的光催化降解RhB性能影响。结果表明,表面氟化可以改变CN表面电子结构,促进光生载流子的分离和传输,从而提升其光催化性能。在优化的实验条件下,CN-0.2F样品对RhB的降解率可达47.9%,是CN光降解率的1.6倍。

g-C_(3)N_(4)(denoted as CN)was prepared using melamine as precursor system,and then treated with different volumes of HF to prepare fluorinated CN surface.The structure,morphology and electrochemical properties of the samples were characterized by XRD,SEM,FT-IR and UV-Vis DRS.The effects of surface fluorination on CN over the UV light induced photocatalytic degradation of rhodamine B(RhB)were preliminarily investigated.The results indicate that the surface electronic structure of CN can be rationally tuned by fluorine ions,thereby boosting the separation and transport of photoinduced charge carriers,ultimately enhancing the photocatalytic performance.Under optimized experimental conditions,the degradation rate of RhB by CN-0.2F sample can reach 47.9%,which is 1.6 times that of pure CN counterpart.