化工进展 ›› 2020, Vol. 39 ›› Issue (9): 3716-3722.DOI: 10.16085/j.issn.1000-6613.2019-1477

• 工业催化 • 上一篇    下一篇

Ag/g-C3N4光催剂的构建及降解7-氨基头孢烷酸机理

李筱玲(), 邓寒霜, 赵艳艳()   

  1. 商洛学院生物医药与食品工程学院,陕西 商洛 726000
  • 出版日期:2020-09-05 发布日期:2020-09-11
  • 通讯作者: 赵艳艳
  • 作者简介:李筱玲(1981—),女,硕士研究生,研究方向为光催化去除水中污染物。E-mail:aling2010@foxmail.com
  • 基金资助:
    张生勇院士专项科研项目(18YSZX001)

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

Xiaoling LI(), Hanshuang DENG, Yanyan ZHAO()   

  1. College of Biology Pharmacy and Food Engineering, Shangluo University, Shangluo 726000, Shaanxi, China
  • Online:2020-09-05 Published:2020-09-11
  • Contact: Yanyan ZHAO

摘要:

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。

关键词: 催化, 催化剂, 银-石墨相氮化碳, 7-氨基头孢烷酸, 降解

Abstract:

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.

Key words: catalysis, catalyst, Ag/g-C3N4, 7-ACA, degradation

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