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Ag3PO4/Ag2S/g-C3N4复合光催化剂的制备与性能
引用本文:邓军阳,汪杰,朱思龙,聂龙辉. Ag3PO4/Ag2S/g-C3N4复合光催化剂的制备与性能[J]. 无机化学学报, 2019, 35(6): 955-964
作者姓名:邓军阳  汪杰  朱思龙  聂龙辉
作者单位:湖北工业大学材料与化学工程学院
基金项目:国家自然科学基金(No.51572074)和湖北省绿色轻质材料重点实验室开放课题(No.201710A12)资助。
摘    要:通过沉积法和离子交换法成功地制备了Ag_3PO_4/Ag_2S/g-C_3N_4复合型光催化剂。利用X射线多晶粉末衍射仪(XRD)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)、X射线光电子能谱(XPS)、N_2吸附-脱附等温线、紫外-可见漫反射光谱、荧光光谱等手段对样品进行了表征。通过降解罗丹明B考察其可见光催化活性及稳定性,研究了硫化钠与磷酸银物质的量的比值(n_(Na_2S)/n_(Ag_3PO_4))、g-C_3N_4添加量对所制备复合光催化材料性能的影响,同时对光催化机理进行了探讨。结果表明,随着n_(Na2S)/n_(Ag3PO4)的增加,所得复合催化材料活性先增加后降低;当n_(Na2S)/n_(Ag_3PO_4)为1.5%、g-C_3N_4与Ag_3PO_4的质量比为3∶7时制备的催化剂ASC1.5的光催化活性最好,在可见光照射下,40 min内可将罗丹明B完全降解,且5次循环使用后仍保持较高的催化活性。和Ag_3PO_4相比,Ag_3PO_4/Ag_2S/g-C_3N_4复合型光催化材料的活性与稳定性都得到明显提高,这主要归因于复合催化剂比表面积和孔结构的增加,载流子分离效率的提高。光催化机理研究表明,空穴(h~+)、超氧阴离子自由基(·O~(2-))和羟基自由基(·OH)都是光催化过程中的主要活性物种。三者作用大小依次为:h~+·O~(2-)·OH。

关 键 词:Ag3PO4  g-C3N4  Ag2S  光催化  可见光
收稿时间:2019-02-14
修稿时间:2019-04-08

Preparation and Performance of Ag3PO4/Ag2S/g-C3N4 Composite Photocatalyst
DENG Jun-Yang,WANG Jie,ZHU Si-Long and NIE Long-Hui. Preparation and Performance of Ag3PO4/Ag2S/g-C3N4 Composite Photocatalyst[J]. Chinese Journal of Inorganic Chemistry, 2019, 35(6): 955-964
Authors:DENG Jun-Yang  WANG Jie  ZHU Si-Long  NIE Long-Hui
Affiliation:School of Materials and Chemical Engineering, Hubei University of Technology, Wuhan 430068, China,School of Materials and Chemical Engineering, Hubei University of Technology, Wuhan 430068, China,School of Materials and Chemical Engineering, Hubei University of Technology, Wuhan 430068, China and School of Materials and Chemical Engineering, Hubei University of Technology, Wuhan 430068, China
Abstract:Ag3PO4/Ag2S/g-C3N4 composite photocatalysts were successfully prepared by a deposition-ion exchanged combined method. And the obtained samples were characterized by X-ray powder diffractometer (XRD), scanning electron microscope (SEM), transmission electron microscope (TEM), X-ray photoelectron spectroscopy (XPS), N2 adsorption and desorption isotherms, UV-visible diffuse reflectance spectroscopy, fluorescence spectrophotometry and so on. The catalytic activity and stability of the catalysts were evaluated by degradation of rhodamine B under visible light. The effect of molar ratio of sodium sulfide to silver phosphate (nNa2S/nAg3PO4) on the photocatalytic performance of the silver phosphate was studied. In addition, the photocatalytic mechanism was also investigated. The results show that, with the increase of nNa2S/nAg3PO4, the activity of the obtained composite catalytic material increased firstly and then decreased. When nNa2S/nAg3PO4 was 1.5%, the obtained ASC1.5 catalyst could completely degrade rhodamine B within 40 min under visible light irradiation, and also maintained high activity after five-cycle use. Compared with single silver phosphate, the activity and stability of Ag3PO4/Ag2S/g-C3N4 composite photocatalytic materials were significantly improved, which was mainly attributed to the increase of surface area and the presence of porous structure that enhanced separating efficiency of electron-hole pairs. The study of photocatalytic mechanism over the composite catalyst have shown that h+, ·O2- and ·OH were the main active species in the photocatalytic process. The order of the role of the above three species was:h+ > ·O2- > ·OH.
Keywords:Ag3PO4  g-C3N4  Ag2S  composite catalyst  photocatalysis  visible light
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