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Exploring the photocatalytic conversion mechanism of gaseous formaldehyde degradation on TiO2-x-OV surface
Li, Xinwei1,2; Li, Haiwei1,2,3; Huang, Yu4,5; Cao, Junji4,5; Huang, Tingting2,6; Li, Rong2,6; Zhang, Qian6; Lee, Shun-cheng1,2; Ho, Wingkei2,4,5,7
Corresponding AuthorLee, Shun-cheng(ceslee@polyu.edu.hk) ; Ho, Wingkei(keithho@eduhk.hk)
2022-02-15
Source PublicationJOURNAL OF HAZARDOUS MATERIALS
ISSN0304-3894
Volume424Pages:9
AbstractTo 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.
KeywordFormaldehyde Photocatalytic degradation Oxygen vacancies Quantum efficiency Intermediates
DOI10.1016/j.jhazmat.2021.127217
WOS KeywordINDOOR AIR-QUALITY ; OXYGEN VACANCY ; CHARGE SEPARATION ; CO2 REDUCTION ; DOPED SRTIO3 ; TIO2 ; OXIDATION ; CATALYSTS ; NO ; BIOCOMPATIBILITY
Indexed BySCI ; SCI
Language英语
Funding ProjectNational 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 Research AreaEngineering ; Environmental Sciences & Ecology
Funding OrganizationNational 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 SubjectEngineering, Environmental ; Environmental Sciences
WOS IDWOS:000704631700004
PublisherELSEVIER
Citation statistics
Cited Times:2[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ieecas.cn/handle/361006/17104
Collection粉尘与环境研究室
Corresponding AuthorLee, Shun-cheng; Ho, Wingkei
Affiliation1.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
Recommended Citation
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.
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