Ag/g-C3N4光催剂的构建及降解7-氨基头孢烷酸机理

研究了Ag/g-C₃N₄光催化剂的制备及降解7-氨基头孢烷酸的性能和机理。通过贵金属表面沉积法制备 Ag/g-C₃N₄光催化剂，利用扫描电镜（SEM）和透射电镜（TEM）研究催化剂的形貌和微观结构，通过X光射线能谱（XRD）研究催化剂的晶体结构，采用红外光谱（FTIR）研究催化剂的表面化学官能团，紫外可见光谱（UV-vis）研究催化剂的能带结构和光学性质，通过光催化降解7-氨基头孢烷酸评价Ag/g-C₃N₄的催化性能。结果表明，本研究制备得到了高纯度和高催化性能的Ag/g-C₃N₄光催化剂，与单体g-C₃N₄相比，Ag/g-C₃N₄的吸光性能得到了明显提升，光生电子-空穴的分离和传输性能得到了增强。可见光照射120min时，7%-Ag/g-C₃N₄对7-ACA的降解效率约为78.55%，是单体g-C₃N₄降解效率的1.38倍。本研究为拓宽g-C₃N₄基催化剂在光催化领域的应用提供了崭新的研究思路。

Preparation of Ag/g-C3N4 photocatalyst and its 7-ACA degradation mechanism

Ag/g-C₃N₄ photocatalyst was prepared by depositing nano-Ag onto the surface of g-C₃N₄ and its photocatalytic performance and mechanism of the degradation of 7-ACA were investigated. Scanning Electron Microscope (SEM) and Transmission Electron Microscopy (TEM) were used to measure the morphology and microstructure, X-Ray Diffraction (XRD) was employed to evaluate the crystal structure, Fourier Transform Infrared spectroscopy (FTIR) was adopted to investigate the surface functional groups, and Ultraviolet and Visible spectroscopy (UV-vis) was taken to test the band energy structure and optical properties of the Ag/g-C₃N₄ composite, and its photocatalytic activity was investigated by degradation of 7-ACA under visible light irradiation. The results indicated that the prepared Ag/g-C₃N₄ composite had high purity and high photocatalytic activity, and the light absorption ability and the photogenerated electron-hole separation and transmission property of the Ag/g-C₃N₄ composite were greatly enhanced compare with pure g-C₃N₄. The 7-ACA degradation rate was about 78.55% with 7% Ag/g-C₃N₄ under visible light irradiation for 120 min, which was about 1.38 times higher than that of pure g-C₃N₄. This study will open up a new insight for the practical application of g-C₃N₄-based photocatalyst in photocatalysis.