银复合对石墨型氮化碳结构及光催化性能的影响

为了提高石墨型氮化碳(g-C_3N_4)的可见光催化性能,利用水热合成,通过片状g-C_3N_4自组装法制备了银复合的石墨型氮化碳材料,研究了不同硝酸银加入量对Ag/g-C_3N_4复合材料的结构与光催化性能的影响。采用紫外-可见(UV-Vis)分光光度计、X射线衍射光谱(XRD)、红外傅立叶变换光谱(FT-IR)和扫描电子显微镜(SEM)对材料的结构与性能进行表征。结果表明:所得复合材料由于g-C_3N_4自组装行为而形成球状结构,其球形的直径随着硝酸银加入量的增加而减小;与g-C_3N_4相比,复合材料具有高的催化性能,可能由于其银的均匀复合以及所形成的3维结构;而Ag(60)/g-C_3N_4表现出最高的催化活性,原因在于银离子浓度对制备的复合催化剂的光学性质、能带及结构的影响。

Effect of Ag Composite on the Structure and Photocatalytic Performance of Graphitic Carbon Nitride

To improve the visible-light photocatalytic performance of graphitic-type carbon nitride (g-C3N4), Ag/g-C3N4 composites graphite carbon nitride was prepared by hydrothermal synthesis of flake g-C3N4 self-assembly method. The effects of adding amounts of silver nitrate on the structure and photocatalytic performance of Ag/g-C3N4 composites were investigated. Ultraviolet visible spectrophotometer (UV-Vis), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), and scanning electron microscopy (SEM) were used to characterize the structure and properties of the composites. The results indicated that the resulting composite had a spherical structure due to the self-assembly behavior of g-C3N4, and its spherical diameter decreased with the increase of silver nitrate. Compared with g-C3N4, the composite material had high catalytic performance, possibly due to its uniform silver composition and the formation of the three-dimensional structure. Ag(60)/g-C3N4 exhibited the highest catalytic activity because of the influence of the silver ion concentration on optical properties, band and structure of the prepared composite catalyst.