Improved photocatalytic performance of acetaldehyde degradation via crystal plane regulation on truncated octahedral CeO_(2)  

作　　者：Bin Xu Lu Jia Hui Yang Yue Wang Si-Yu Fan Sai-Sai Yuan Qi-TaoZhang Ming Zhang Teruhisa Ohno 

机构地区：[1]School of Chemistry and Chemical Engineering,Yangzhou University,Yangzhou 225002,China [2]College of Environmental Science and Engineering,Yangzhou University,Yangzhou225127,China [3]Department of Applied Chemistry,Faculty of Engineering,Kyushu Institute of Technology,Kitakyushu,804-8550,Japan [4]School of Environmental and Chemical Engineering,Jiangsu University of Science and Technology,Zhenjiang 212000,China [5]National&Local Joint Engineering Research Center for Mineral Salt Deep Utilization,Huaiyin Institute of Technology,Huaian 223003,China [6]School of Materials Science and Engineering,Henan University of Science and Technology,Luoyang 471000,China [7]International Collaborative Laboratory of 2D Materials for Optoelectronics Science and Technology of Ministry of Education,Institute of Microscale Optoelectronics,Shenzhen University,Shenzhen 518060,China

出　　处：《Rare Metals》2024年第5期2026-2038,共13页稀有金属（英文版）

基　　金：supported by the National Natural Science Foundation of China(Nos.21805191 and 22205084);Project funded by China Postdoctoral Science Foundation(No.2023M741039);Project funded by National&Local Joint Engineering Research Center for Mineral Salt Deep Utilization(SF202303);Project Funded by Yangzhou University(137013308),Guangdong Basic and Applied Basic Research Foundation(No.2020A1515010982);Shenzhen Stable Support Project(No.20200812122947002),the Innovative Science and Technology Platform Project of Cooperation between Yangzhou City and Yangzhou University;Postgraduate Research&Practice Innovation Program of Jiangsu Province(Yangzhou University,No.XKYCX20_014)。

摘　　要：In this study,the truncated octahedral CeO_(2)(CeO_(2)-to)with special morphology was prepared by the solvothermal method with oleic acid(OA)and oleamine(OM)as the morphology-directing agents.High-resolution transmission electron microscopy(HRTEM)results show that CeO_(2)-to exposes composite{100}and{111}facets,while CeO_(2)cubic(CeO_(2)-c)and CeO_(2)octahedral(CeO_(2)-o)only expose single crystal facets of{100}plane and{111}plane,respectively.Interestingly,this CeO_(2)-to photocatalyst exhibits remarkable photooxidation performance of gaseous acetaldehyde(CH_(3)CHO)degradation,in which CO_(2)generation value reaches 1.78 and 7.97-times greater than that of CeO_(2)-c and CeO_(2)-o,respectively.In addition,the active species trapping experiment signifies that superoxide(·O_(2)^(-))and holes(h^(+))are the main reactive substances during the CH_(3)CHO degradation process,and the electron paramagnetic resonance(EPR)spectra indicates that the former is the major contributor.Notably,the electron transfer mechanism between CeO_(2)-to{100}and{111}facets and the surface oxygen adsorption ability are revealed via density functional theory(DFT)calculations.It is also confirmed that{100}facets are more conducive to the absorption of acetaldehyde than{111}facets.Finally,a reasonable mechanism for improved photocatalytic CH_(3)CHO degradation on CeO_(2)-to is proposed based on relevant experiments and DFT calculations.This study demonstrates that the systematic development of surface homojunction structured photocatalysts can efficiently increase the degradation activity for volatile organic compounds(VOCs).It also offers additional direction for optimizing the photocatalytic activity of other ceriumbased photocatalysts.

关 键 词：Truncated octahedral CeO_(2)(CeO_(2)-to) Composite crystal faces Surface energy level Efficient electrontransfer 

分 类 号：O643.36[理学—物理化学] O644.1[理学—化学] X701[环境科学与工程—环境工程]