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
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.
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.
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