Ag_3PO_4/BiPO_4复合光催化剂的制备及其降解罗丹明B的研究  

Study on Preparation of Ag_3PO_4/BiPO_4 and the Photocatalytic Performance for Degradation of Rhodamine B

作　　者：刘向辉[1] 杨巧文[1] 徐菁 LIU Xianghui, YANG Qiaowen , XU Jing(School of Chemical ＆ Environmental Engineering, China University of Mining ＆ Technology, Beijing 100083 Chin)

机构地区：[1]中国矿业大学(北京)化学与环境工程学院,北京100083

出　　处：《西华大学学报（自然科学版）》2018年第3期48-54,共7页Journal of Xihua University:Natural Science Edition

摘　　要：采用水热法合成复合Ag_3PO_4/BiPO_4光催化剂,考察不同p H和不同复合比例下合成的光催化剂对溶液中罗丹明B的光催化降解性能,并与BiPO_4进行对比。结果表明:在p H=7,复合比例Ag_3PO_4/BiPO_4摩尔比为4∶3条件下水热制备的Ag_3PO_4/BiPO_4对可见光的利用率最高,催化性能最好;降解180 min后,对罗丹明B的降解率达到61%,较纯相BiPO_4提升了27%。本文还利用XRD、SEM和紫外可见漫反射(UV-Vis DRS)等测试手段对合成的样品进行表征,分析得出复合Ag_3PO_4之后,催化剂的禁带宽度变窄,并出现较多的独居石晶型BiPO_4,光生电子与空穴复合效率变低,从而使复合材料的光催化降解罗丹明B的能力得到提升。A series of Ag3PO4/BiPO4 composite photocatalysts with different doping proportion of BiPO4 and Ag3PO4 were synthesized by a hydrothermalmethod at different p H. The photocatalytic activity was investigated for degradation of Rhodamine B. The results shows that the photocatalystprepared by hydrothermal method at p H = 7 and Ag3PO4/BiPO4 composite ratio at 4 ∶ 3 has the best catalytic performance. The degradation rate of rhodamine B reaches61% after 180 min reaction,which is 27% higher than pure phase BiPO4. The samples are characterized by XRD,SEM and ultraviolet-visible diffuse reflection（ UV-Vis DRS）,which indicates that the bandgap width of catalyst decreases,the more monoclinic type of BiPO4 increases and the efficiency of photo-generated electrons and holes become lower. All of these properties canimprove the activity of degradation Rhodamine B.

关 键 词：Ag3PO4/BiPO4 水热法 光催化剂 罗丹明B 

分 类 号：O643.36[理学—物理化学]