微量Ag_3PO_4改性g-C_3N_4的可见光催化活性研究  

Study on visible-light photocatalytic activity of g-C_3N_4 modified by trace Ag_3PO_4

作　　者：张鑫鑫[1] 徐莉[1] 李磊[1] 罗青枝[1] 王德松[1] 

机构地区：[1]河北科技大学化学与制药工程学院,河北石家庄050018

出　　处：《河北科技大学学报》2015年第3期255-262,共8页Journal of Hebei University of Science and Technology

基　　金：国家自然科学基金(21271061);河北省自然科学基金(B2014208103)

摘　　要：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。Novel polymeric Ag3 PO4/g-C3 N4 photocatalysts modified by trace Ag3PO4 are prepared via a facile method. The obtained Agz PO4/g-C3 N4 composite products are characterized by X-ray diffraction （XRD）, Fourier Transform Infrared Spec- troscopy （FT-IR）, transmission electron microscopy （TEM）, scanning electron microscopy （SEM）, X-ray photoelectron spec- troscopy （XPS）, UV-vis diffuse reflection spectroscopy （DRS）, and photoluminescence spectroscopy （PL）. The photocatalytic activities of Ag3PO4/g-C3 N4 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 Ag3 PO4, and the Ag3 PO4 doping can hardly affect the crystallinity of the as-prepared g-C3 N4 materials, but it improves greatly their visible light absorption and separation effi- ciency of photogenerated electron/hole pairs. The Ag3 PO4/g-C3 N4 photocatalysts exhibits significantly enhanced photocatalytic performance.

关 键 词：催化化学 光催化剂 Ag3PO4 g-C3N4 改性 光催化 

分 类 号：O649.4[理学—物理化学]