微量Ag_3PO_4改性g-C_3N_4的可见光催化活性研究

采用一种简易方法制备了较低Ag3PO4含量的Ag3PO4/g-C3N4复合可见光催化剂,采用X射线衍射(XRD)、傅里叶变换红外光谱(FT-IR)、透射电子显微镜(TEM)、扫描电子显微镜(SEM)、紫外可见漫反射光谱(UV-vis DRS)、荧光光谱(PL)和X射线光电子能谱(XPS)等对Ag3PO4/gC3N4进行了系统分析与表征。通过在Ag3PO4/g-C3N4存在条件下甲基橙的光降解反应,考察该催化剂的可见光催化活性。结果表明,所制备的复合材料中确实存在Ag3PO4,Ag3PO4的引入对gC3N4晶型结构没有明显的影响,但显著提高了其在可见光区的吸收能力和光生电子/空穴对的分离效率,提高了其可见光催化活性。

Study on visible-light photocatalytic activity of g-C3N4 modified by trace Ag3PO4

Novel polymeric Ag₃PO₄/g-C₃N₄ photocatalysts modified by trace Ag₃PO₄ are prepared via a facile method. The obtained Ag₃PO₄/g-C₃N₄ composite products are characterized by X-ray diffraction (XRD), Fourier Transform Infrared Spectroscopy (FT-IR), transmission electron microscopy (TEM), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), UV-vis diffuse reflection spectroscopy (DRS), and photoluminescence spectroscopy (PL). The photocatalytic activities of Ag₃PO₄/g-C₃N₄ samples are investigated by evaluating the decomposition of methyl orange (MO) under visible light irradiation. The results reveal that the polymeric material is doped by Ag₃PO₄, and the Ag₃PO₄ doping can hardly affect the crystallinity of the as-prepared g-C₃N₄ materials, but it improves greatly their visible light absorption and separation efficiency of photogenerated electron/hole pairs. The Ag₃PO₄/g-C₃N₄ photocatalysts exhibits significantly enhanced photocatalytic performance.