Bi_2MoO_6/BiVO_4异质结光催化剂的制备及性能  

Synthesis of Bi_2MoO_6/BiVO_4 Heterojunction and Its Efficient Visible Light Photocatalytic Activity

作　　者：张宇[1] 王敏[1] 周鑫 杨光俊 柴天煜 朱彤[1] ZHANG Yu;WANG Min;ZHOU Xin;YANG Guangjun;CHAI Tianyu;ZHU Tong(School of Mechanical Engineering and Automation,University of Northeastern University,Shenyang 110819;Liaoning Wastewater Treatment and Management Center,Shenyang 110000)

机构地区：[1]东北大学机械工程与自动化学院,沈阳110819 [2]辽宁省污水处理管控中心,沈阳110000

出　　处：《材料导报》2019年第10期1597-1601,共5页Materials Reports

基　　金：国家自然科学基金青年项目(21207093);辽宁省高等学校优秀人才支持计划(LJQ2014023)~~

摘　　要：本工作采用水热法+热处理法制备了Bi_2MoO_6/BiVO_4异质结复合光催化剂,并采用XRD、SEM、EDS-Mapping、XPS和UV-vis DRS对一系列样品进行了表征。结果表明:不同比例的Bi_2MoO_6异质复合BiVO_4均未改变BiVO_4的晶体结构,但由于二者之间形成了异质结结构,其结晶程度有所提高;与纯BiVO_4相比,复合光催化剂的光吸收边发生红移,对可见光的光响应范围扩大,Bi_2MoO_6与BiVO_4形成的异质结结构有利于提高光生电子-空穴的分离效率,从而表现出更高的光催化活性。当Bi_2MoO_6与BiVO_4的质量比为5%时,样品的光催化活性最高,光照50 min后对甲基橙的降解率为58%,分别是纯相BiVO_4和Bi_2MoO_6的2.3倍、2.8倍,样品重复稳定性好。通过活性基捕获实验,证明了甲基橙溶液降解过程中,羟基和空穴为主要活性物质。B i 2MoO 6/BiVO 4 heterojunction photocatalysts were synthesized via a hydrothermal-calcination method.The synthesized samples were cha-racterized by XRD,SEM,EDS-Mapping,XPS and UV-vis DRS.The results indicated that the crystal structure of BiVO 4 remained unchanged even though various proportions of Bi 2MoO 6 was added to form hetero-composite with BiVO 4.While there was a certain increase in crystallinity degree,thanks to the heterojunction structure of Bi 2MoO 6 and BiVO 4.Compared with pure BiVO 4,a red-shift in the photoabsorption edge of the Bi 2MoO 6/BiVO 4 composite photocatalyst could be observed,resulting in a enlargement of response range of visible light,which contributed to improving the separation efficiency of electron-hole pairs and further enhancing the photocatalytic activity.Specifically,the Bi 2MoO 6/BiVO 4 composite photocatalyst possessed the highest photocatalytic activity when the mass ratio of Bi 2MoO 6 and BiVO 4 was 5%.The degradation rate of methyl orange was 58%,which was 2.3 and 2.8 times of pure BiVO 4 and Bi 2MoO 6,respectively.Besides,the recycling experiments presented that the Bi 2MoO 6/BiVO 4 composite photocatalyst retained excellent photo-stability after five-time recycles.The trapping experiments confirmed that the active species h+and·OH played an dominant role in the process of photocatalytic degradation.

关 键 词：Bi2MoO6 BIVO4 异质结 光催化剂 甲基橙 

分 类 号：O643[理学—物理化学]