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现代化工  2021, Vol. 41 Issue (1): 93-98    DOI: 10.16606/j.cnki.issn0253-4320.2021.01.019
  科研与开发 本期目录 | 过刊浏览 | 高级检索 |
Ag掺杂三氧化钨的制备及其光催化降解甲苯性能研究
李阳达1, 李丹1, 王丽萍1,2
1. 中国矿业大学环境与测绘学院, 江苏 徐州 221116;
2. 矿山生态修复教育部工程研究中心, 江苏 徐州 221116
Preparation of silver-doped WO3 and study on its photocatalytic performance for degradation of toluene
LI Yang-da1, LI Dan1, WANG Li-ping1,2
1. School of Environment Science and Spatial Informatics, China University of Mining and Technology, Xuzhou 221116, China;
2. Engineering Research Center of Mine Ecological Remediation, The Ministry of Education, Xuzhou 221116, China
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摘要 以钨酸钠与硝酸银为原料,采用水热法将Ag元素引入斜方晶型WO3光催化剂,探究了Ag元素提高WO3光催化活性的机理。光催化降解实验结果表明,当n(Ag):n(W)=1:500时,甲苯的降解效率达到90%以上,与未掺杂Ag的WO3相比,其降解效率提高11.7%;第3次循环时甲苯降解率达到82%,表明Ag/WO3具有较高的稳定性。综合表征结果表明,Ag元素的添加不改变WO3的晶型结构,随着Ag元素掺杂比例的增加,WO3粒径不断减小,禁带宽度由2.23 eV降低为1.72 eV。Ag元素的掺杂增加了WO3中的氧空位,促进了电子-空穴的分离。但当n(Ag):n(W)>1:500时,过多的氧空位形成了新的复合中心,更多的电子被束缚,导致WO3催化活性降低。
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李阳达
李丹
王丽萍
关键词:  光催化  三氧化钨  银掺杂  甲苯  水热法    
Abstract: Silver is doped into orthorhombic tungsten trioxide (WO3) through hydrothermal method with sodium tungstate and silver nitrate as raw materials.Influence of silver doping on the photocatalytic activity of Ag/WO3 is investigated.The as-prepared catalysts are characterized to explain the amelioration effect of silver on WO3 in detail.Photocatalytic degradation experiment results show the degradation rate of toluene over Ag/WO3 exceeds 90% when n(Ag):n(W)=1:500,which is 11.7% higher than that over WO3 without Ag doping.The degradation rate of toluene can reach 82% when Ag/WO3 is used for the third recycling,indicating a high stability.Comprehensive analysis results show that the addition of silver has not impact on the crystal structure of WO3.The particle size of WO3 decreases with the increase of Ag doping ratio.Silver doping reduces bandgap energy of WO3 from 2.23 eV to 1.72 eV,enhances oxygen vacancies in WO3 and promotes separation of electron and hole.However,excessive oxygen vacancies form new recombination centers and affect the separation process of electron-hole negatively when n(Ag):n(W) exceeds 1:500,thus the degradation rate of toluene decreases.
Key words:  photocatalysis    WO3    Ag-doping    toluene    hydrothermal method
收稿日期:  2020-09-16      修回日期:  2020-11-08          
ZTFLH:  X701  
基金资助: 国家自然科学基金项目(51602344);江苏省研究生科研与实践创新计划项目(KYCX19-2164);中国矿业大学研究生科研与实践创新计划项目(KYCX19-2164)
通讯作者:  王丽萍(1963-),女,博士,教授,研究方向为环境生态修复与环境功能材料,通讯联系人,wlpcumt@126.com。    E-mail:  wlpcumt@126.com
作者简介:  李阳达(1993-),男,硕士研究生,研究方向为环境功能材料,liyangda50@163.com
引用本文:    
李阳达, 李丹, 王丽萍. Ag掺杂三氧化钨的制备及其光催化降解甲苯性能研究[J]. 现代化工, 2021, 41(1): 93-98.
LI Yang-da, LI Dan, WANG Li-ping. Preparation of silver-doped WO3 and study on its photocatalytic performance for degradation of toluene. Modern Chemical Industry, 2021, 41(1): 93-98.
链接本文:  
https://www.xdhg.com.cn/CN/10.16606/j.cnki.issn0253-4320.2021.01.019  或          https://www.xdhg.com.cn/CN/Y2021/V41/I1/93
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