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Exploring the Reactivity of Multicomponent Photocatalysts: Insight into the Complex Valence Band of BiOBr
Fang, Yan-Fen1; Ma, Wan-Hong1; Huang, Ying-Ping1; Cheng, Gen-Wei2
Corresponding AuthorHuang, YP
2013
Source PublicationCHEMISTRY-A EUROPEAN JOURNAL
ISSN0947-6539
EISSN1521-3765
Volume19Issue:9Pages:3224-3229
SubtypeArticle
AbstractThe band structure of multicomponent semiconductor photocatalysts, as well as their reactivity distinction under different wavelengths of light, is still unclear. BiOBr, which is a typical multicomponent semiconductor, may have two possible valence-band structures, that is, two discrete valence bands constructed respectively from O2p and Br4p orbitals, or one valence band derived from the hybridization of these orbitals. In this work, aqueous photocatalytic hydroxylation is applied as the probe reaction to investigate the nature and reactions of photogenerated holes in BiOBr. Three organic compounds (microcystin-LR, aniline, and benzoic acid) with different oxidation potentials were selected as substrates. Isotope labeling (H218O as the solvent) was used to determine the source of the Oatom in the hydroxyl group of the products, which distinguishes the contribution of different hydroxylation pathways. Furthermore, a spin-trapping ESR method was used to quantify the reactive oxygen species (.OH and .OOH) formed in the reaction system. The different isotope abundances of the hydroxyl Oatom of the products formed, as well as the reverse trend of the .OH/.OOH ratio with the oxidative resistance of the substrate under UV and visible irradiation, reveal that BiOBr has two separate valence bands, which have different oxidation ability and respond to UV and visible light, respectively. This study shows that the band structure of semiconductor photocatalysts can be reliably analyzed with an isotope labeling method.
KeywordEsr Spectroscopy Hydroxylation Isotopic Labeling Photocatalysis Semiconductors
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.1002/chem.201202602
WOS Subject ExtendedChemistry
Indexed BySCI
WOS KeywordVISIBLE-LIGHT ; NANOPLATE MICROSPHERES ; I PHOTOCATALYSTS ; TIO2 ; BR ; CL ; UV ; DEGRADATION
Language英语
Quartile2区
TOP
WOS SubjectChemistry, Multidisciplinary
WOS IDWOS:000315142300035
Funding OrganizationNational Natural Science Foundation of China(21177072 ; National Basic Research Program of China(2008CB417206) ; Youth Scientific Research Funds(65121003) ; 21207079)
Citation statistics
Cited Times:47[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imde.ac.cn/handle/131551/5456
Collection山地表生过程与生态调控重点实验室
Affiliation1.China Three Gorges Univ, Minist Educ, Engn Res Ctr Ecoenvironm Three Gorges Reservoir R, Hubei 443002, Peoples R China
2.Chinese Acad Sci, Inst Mt Hazards & Environm, Chengdu 610041, Peoples R China
Recommended Citation
GB/T 7714
Fang, Yan-Fen,Ma, Wan-Hong,Huang, Ying-Ping,et al. Exploring the Reactivity of Multicomponent Photocatalysts: Insight into the Complex Valence Band of BiOBr[J]. CHEMISTRY-A EUROPEAN JOURNAL,2013,19(9):3224-3229.
APA Fang, Yan-Fen,Ma, Wan-Hong,Huang, Ying-Ping,&Cheng, Gen-Wei.(2013).Exploring the Reactivity of Multicomponent Photocatalysts: Insight into the Complex Valence Band of BiOBr.CHEMISTRY-A EUROPEAN JOURNAL,19(9),3224-3229.
MLA Fang, Yan-Fen,et al."Exploring the Reactivity of Multicomponent Photocatalysts: Insight into the Complex Valence Band of BiOBr".CHEMISTRY-A EUROPEAN JOURNAL 19.9(2013):3224-3229.
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