Ag₃VO₄/ZnO复合催化剂的制备及其光催化性能  

Preparation of Ag3VO4/ZnO Composites and Their Photocatalytic Activities

作　　者：陈计荀 李子全[1,2] 陈建康 刘劲松[1,3] 

机构地区：[1]南京航空航天大学材料科学与技术学院,江苏南京 [2]南京邮电大学先进材料研究所,江苏南京 [3]南京航空航天大学,机械结构力学与控制国家重点实验室,江苏南京

出　　处：《材料科学》2019年第3期202-209,共8页Material Sciences

基　　金：中央高校基本科研业务费专项资金(No.NS2017038);江苏高校优势学科建设工程资助项目对本文的资助。

摘　　要：本文以柠檬酸为诱导剂,采用水热法首先合成花状ZnO,然后进一步通过化学沉淀法将Ag3VO4负载在花状ZnO上形成Ag3VO4/ZnO异质结复合物。并通过XRD、SEM、UV-vis、DRS和PL等手段对合成样品的结构组成、形貌和光学性能进行了表征,并以RhB和MB为目标降解物,探究了复合样品的光催化性能。结果发现,Ag3VO4颗粒成功地负载在ZnO表面,提高了可见光的响应范围及载流子的分离效率,相对于单独的ZnO和Ag3VO4,构成的Ag3VO4/ZnO异质结复合物提高了光催化降解效率,并且当Ag3VO4的摩尔负载比达到15%时,对于RhB和MB的降解效率达到了96%和88%。更深一步的捕获实验发现,超氧自由基(?O2?)和空穴(h+)是光催化降解过程中起主要作用的活性自由基。In this paper,flower-like ZnO was synthesized by hydrothermal method using citric acid as inducer,and Ag3VO4/ZnO was formed by loading the Ag3VO4 on flower-like ZnO by chemical precipitation.The structure,morphology and optical properties of the synthesized samples were characterized by XRD,SEM,Uv-vis,DRS and PL characterization.The photocatalytic properties of the composite samples were investigated by using RhB and MB as the target degradants.It was found that Ag3VO4 particles were successfully supported on the surface of ZnO,and the loading of Ag3VO4 particles increased the response range of visible light and improved the separation efficiency of carriers.Compared with ZnO and Ag3VO4 alone,the Ag3VO4/ZnO heterojunction composite enhanced the photocatalytic degradation efficiency,and when the molar loading ratio of Ag3VO4 reached 15%,the degradation efficiency for RhB and MB reached 96%and 88%.Further capture experiment found that superoxide radicals(?O2?)and holes(h+)are active free radicals that play a major role in photocatalytic degradation.

关 键 词：Ag₃VO₄/ZnO复合物 光催化降解 活性自由基 

分 类 号：O64[理学—物理化学]