中文摘要：

利用硝酸银见光分解的特性合成了Ag负载的Ag/g-C3N4光催化剂。采用X射线衍射（XRD）、傅里叶变换红外光谱（FT-IR）、紫外-可见光谱（UV-vis）对材料进行了表征。然后以亚甲基蓝和甲基橙为对象,对比研究了g-C3N4与Ag/g-C3N4对两种不同类型染料的光催化活性。实验结果表明,Ag/g-C3N4比g-C3N4对两种染料具有更好的光催化性能。不同的光催化剂对于电性不同的染料具有不同的光降解能力,g-C3N4对阴离子染料有较好的选择性,而Ag/g-C3N4对阳离子型染料具有更好的催化降解作用。因此Ag的负载,不仅增强了g-C3N4的对染料的光催化能力,还改变了g-C3N4对染料的光催化选择性。

英文摘要：

The silver-doped Ag/g-C3N4 were synthesized by utilizing the decomposition characteristics of silver nitrate under light. The samples were characterized by X-ray diffraction（ XRD）,Fourier transform infrared spectroscopy（ FT-IR）,and UV-vis diffuse reflectance spectroscopy. Then,the comparative studies of the photocatalytic activity of g-C3N4 and Ag/g-C3N4 for two different types dyes（ methyl orange and methylene blue） were carried out.Experimental results show that Ag/g-C3N4 have better photocatalytic properties than g-C3N4. Different photocatalysts have different photocatalytic activities for dyes bearing different charges. g-C3N4 shows better photocatalytic degradation for anionic dyes,but Ag/g-C3N4 for cationic dyes. Therefore,silver doping in g-C3N4 not only enhances the ability of the photocatalytic performance for dyes,but also changes the selectivity of g-C3N4 for photocatalytic degradation of dyes.