Exploring the photocatalytic conversion mechanism of gaseous formaldehyde degradation on TiO2-x-OV surface

doi:10.1016/j.jhazmat.2021.127217

IEECAS OpenIR > 粉尘与环境研究室

	Exploring the photocatalytic conversion mechanism of gaseous formaldehyde degradation on TiO2-x-OV surface
	Li, Xinwei 1,2; Li, Haiwei 1,2,3; Huang, Yu 4,5; Cao, Junji 4,5; Huang, Tingting 2,6; Li, Rong 2,6; Zhang, Qian 6; Lee, Shun-cheng 1,2; Ho, Wingkei 2,4,5,7
通讯作者	Lee, Shun-cheng(ceslee@polyu.edu.hk) ; Ho, Wingkei(keithho@eduhk.hk)
	2022-02-15
发表期刊	JOURNAL OF HAZARDOUS MATERIALS
ISSN	0304-3894
卷号	424 页码:9
摘要	To understand the conversion mechanism of photocatalytic gaseous formaldehyde (HCHO) degradation, strontium (Sr)-doped TiO2-x-OV catalysts was designed and synthesized in this study, with comparable HCHO removal performance. Our results proved that foreign-element doping reduced Ti4+ to the lower oxidation state Ti(4-x)+, and that the internal charge kinetics was largely facilitated by the unbalanced electron distribution. Oxygen vacancies (OVs) were developed spontaneously to realize an electron-localized phenomenon in TiO2-x-OV, thereby boosting O-2 adsorption and activation for the enhanced generation of reactive oxygen species (ROS). At the chemisorption stage, in-situ DRIFTS spectra and density functional theory calculation results revealed that surface adsorbed O-2 (O-ads) and lattice O (O-lat) engaged in the isomerisation of HCHO to dioxymethylene (DOM) on TiO2-x-OV and TiO2, respectively. Time-resolved DRIFTS spectra under light irradiation revealed that the DOM was then converted to formate and thoroughly oxidized to CO2 and H2O in TiO2-x-OV. While bicarbonate byproducts were detected from DOM hydroxylation or possible side conversion of CO2 in TiO2, owing to insufficient consumption of surface hydroxyl. Our study enhances the understanding on the photocatalytic oxidation of HCHO, thereby promoting the practical application in indoor air purification.
关键词	Formaldehyde Photocatalytic degradation Oxygen vacancies Quantum efficiency Intermediates
DOI	10.1016/j.jhazmat.2021.127217
关键词[WOS]	INDOOR AIR-QUALITY ; OXYGEN VACANCY ; CHARGE SEPARATION ; CO2 REDUCTION ; DOPED SRTIO3 ; TIO2 ; OXIDATION ; CATALYSTS ; NO ; BIOCOMPATIBILITY
收录类别	SCI ; SCI
语种	英语
资助项目	National Key Research and Devel-opment Program of China[2016YFA0203000] ; Theme-based Research Scheme[T24/504/17] ; Research Grant Council of Hong Kong SAR Government[18301117] ; Research Grant Council of Hong Kong SAR Government[PolyU152083/14E] ; Research Grant Council of Hong Kong SAR Government[PolyU152090/15E] ; Hong Kong SAR Government[ECF 63/2019] ; Department Collaborative Fund[04490] ; Faculty of Liberal Arts and Social Sciences, The Education University of Hong Kong, Hong Kong SAR Government[FLASS/DRF 04554] ; West Light Foundation of the Chinese Academy of Sciences[XAB2018B06]
WOS研究方向	Engineering ; Environmental Sciences & Ecology
项目资助者	National Key Research and Devel-opment Program of China ; Theme-based Research Scheme ; Research Grant Council of Hong Kong SAR Government ; Hong Kong SAR Government ; Department Collaborative Fund ; Faculty of Liberal Arts and Social Sciences, The Education University of Hong Kong, Hong Kong SAR Government ; West Light Foundation of the Chinese Academy of Sciences
WOS类目	Engineering, Environmental ; Environmental Sciences
WOS记录号	WOS:000704631700004
出版者	ELSEVIER
引用统计	被引频次：39[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.ieecas.cn/handle/361006/17104
专题	粉尘与环境研究室
通讯作者	Lee, Shun-cheng; Ho, Wingkei
作者单位	1.Hong Kong Polytech Univ, Dept Civil & Environm Engn, Hong Kong, Peoples R China 2.Hong Kong Polytech Univ, Shenzhen Res Inst, Shenzhen 518057, Peoples R China 3.Nanjing Univ Informat Sci & Technol, Collaborat Innovat Ctr Atmospher Environm & Equip, Sch Environm Sci & Engn, Jiangsu Key Lab Atmospher Environm Monitoring & P, Nanjing 210044, Peoples R China 4.Chinese Acad Sci, Inst Earth Environm, State Key Lab Loess & Quaternary Geol SKLLQG, Xian 710061, Peoples R China 5.Chinese Acad Sci, Inst Earth Environm, Key Lab Aerosol Chem & Phys, Xian 710061, Peoples R China 6.Educ Univ Hong Kong, Dept Sci & Environm Studies, Hong Kong, Peoples R China 7.City Univ Hong Kong, State Key Lab Marine Pollut, Hong Kong, Peoples R China
推荐引用方式 GB/T 7714	Li, Xinwei,Li, Haiwei,Huang, Yu,et al. Exploring the photocatalytic conversion mechanism of gaseous formaldehyde degradation on TiO2-x-OV surface[J]. JOURNAL OF HAZARDOUS MATERIALS,2022,424:9.
APA	Li, Xinwei.,Li, Haiwei.,Huang, Yu.,Cao, Junji.,Huang, Tingting.,...&Ho, Wingkei.(2022).Exploring the photocatalytic conversion mechanism of gaseous formaldehyde degradation on TiO2-x-OV surface.JOURNAL OF HAZARDOUS MATERIALS,424,9.
MLA	Li, Xinwei,et al."Exploring the photocatalytic conversion mechanism of gaseous formaldehyde degradation on TiO2-x-OV surface".JOURNAL OF HAZARDOUS MATERIALS 424(2022):9.