基于单质法合成直接Z型CuS-WO3及光催化性能
Synthesis Direct Z-Scheme CuS-WO3 Photocatalysts Based on an Element-Reaction Route and Their Photocatalytic Activity
摘要
Abstract
CuS fabricated by an element-reaction route using copper and sulfur powders was loaded on WO3 in situ at a low temperature.X-ray diffraction,scanning electron microscopy,X-ray photoelectron spectroscopy,Brunauer-Emmett-Teller analysis,and UV-visible diffuse reflectance spectra were used to characterize the crystalline phase,morphology,particle size,and optical properties of the CuS-WO3 samples.CuS modification had no obvious influence on the crystalline phase,particle size,and surface area of WO3.However,it led to the enhancement of the utilization of light energy for WO3.CuS-WO3 composites were utilized as photocatalysts for the degradation of Rhodamine B.The CuS-WO3 photocatalysts showed higher photocatalytic activity than pure WO3 or CuS under visible light irradiation.CuS content had a significant influence on the photocatalytic activity of CuS-WO3.CuS-WO3 with 7％ (w,mass fraction) CuS content exhibited the highest photocatalytic degradation activity (91.3％).Based on analysis of the band structure of CuS and WO3,photoluminescence results,and active species trapping,a "direct Z-scheme" mechanism for the enhanced photocatalytic activity of CuS-WO3 was proposed.The "direct Z-scheme" results in effective charge separation,leading to increased photocatalytic activity compared to that of CuS and WO3.关键词
硫化铜/氧化钨/直接Z型/罗丹明B/光催化Key words
CuS/WO3/Direct Z-scheme/Rhodamine B/Photocatalytic分类
化学化工引用本文复制引用
宋春冬,张静,高莹,卢圆圆,王芳芳..基于单质法合成直接Z型CuS-WO3及光催化性能[J].物理化学学报,2017,33(9):1891-1897,7.基金项目
The project was supported by the National Natural Science Foundation of China (21573101,20903054),the Liaoning Provincial Natural Science Foundation (2014020107),the Program for Liaoning Excellent Talents in University (LJQ2014041),the Scientific Research Foundation for the Returned Overseas Chinese Scholars,State Education Ministry ([2013]1792),the support plan for Distinguished Professor of Liaoning Province ([2015] 153),the Liaoning BaiQianWan Talents program ([2017]96),and the fund of the State Key Laboratory of Catalysis in DICP (N-15-10).国家自然科学基金(21573101),辽宁省自然科学基金项目(2014020107),辽宁省高等学校优秀人才支持计划项目(LJQ2014041),教育部留学回国科研启动基金项目(教外司留[2013]1792号),辽宁省特聘教授项目([2015]153),辽宁省百千万人才工程科技项目([2017]96)和中国科学院大连化学物理研究所催化基础重点实验室开放课题项目(N-15-10)资助 （21573101,20903054）
