Ag/g-C3N4光催剂的构建及降解7-氨基头孢烷酸机理

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

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(UVvis)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。

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 electronhole 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.