Ag/g-C_3N_4复合光催化剂的固相合成及光催化性能研究

Solid Phase Synthesis of Ag/g-C_3N_4 Composite Photocatalysts and Their Photocatalytic Activity

采用浓硫酸剥离法对块体石墨相氮化碳g-C_3N_4进行剥离,得到高分散性的片状g-C_3N_4,然后用固相合成法制得Ag/g-C_3N_4复合光催化剂。采用X射线衍射、傅立叶变换红外光谱及电子扫描显微镜对合成材料进行了分析表征,并以亚甲基蓝降解为特征反应考察了块状g-C_3N_4、片状g-C_3N_4及Ag/g-C_3N_4复合光催化剂的光催化活性。实验结果表明,与块状g-C_3N_4相比,片状g-C_3N_4在水溶液中有良好的分散性,光催化活性明显提高,Ag/g-C_3N_4复合光催化剂的催化性能最好,并且Ag/g-C_3N_4复合光催化剂能使对硝基苯酚向对硝基苯胺快速还原转化。

The graphite-phase nitrided carbon g-C3N4 was stripped by modified concentrated sulfuric acid stripping method to obtain highly dispersed flake g-C3N4.And Ag/g-C3N4 composite catalyst was prepared by solid-phase synthesis method.The prepared materials were characterized by X-ray diffraction（XRD）,Fourier transform infrared spectroscopy（FT-IR）and scanning electron microscopy（SEM）.The photocatalytic properties of massive g-C3N4,flaked g-C3N4 and Ag/g-C3N4 composite were tested on the photodegradation of methylene blue（MB）.The results show that the flaked g-C3N4 has better dispersibility in the aqueous solution than the massive g-C3N4,and the photocatalytic activity is improved obviously.The prepared Ag/g-C3N4 composite catalyst has the best catalytic performance,and can rapidly catalyze the rapid conversion of p-nitrophenol to p-nitroaniline.