Exploring the Reactivity of Multicomponent Photocatalysts: Insight into the Complex Valence Band of BiOBr

CORC > 成都山地灾害与环境研究所 > 中国科学院水利部成都山地灾害与环境研究所 > 山地表生过程与生态调控重点实验室

	Exploring the Reactivity of Multicomponent Photocatalysts: Insight into the Complex Valence Band of BiOBr
	Fang, Yan-Fen 1; Ma, Wan-Hong 1; Huang, Ying-Ping 1; Cheng, Gen-Wei2
刊名	CHEMISTRY-A EUROPEAN JOURNAL
	2013-02-01
卷号	19 期号:9 页码:3224-3229
关键词	ESR spectroscopy hydroxylation isotopic labeling photocatalysis semiconductors
ISSN号	0947-6539
通讯作者	Huang, YP
英文摘要	The 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.
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Chemistry, Multidisciplinary
研究领域[WOS]	Chemistry
关键词[WOS]	VISIBLE-LIGHT ; NANOPLATE MICROSPHERES ; I PHOTOCATALYSTS ; TIO2 ; BR ; CL ; UV ; DEGRADATION
收录类别	SCI
语种	英语
WOS记录号	WOS:000315142300035
公开日期	2013-06-24
内容类型	期刊论文
源URL	[http://ir.imde.ac.cn/handle/131551/5456]
专题	成都山地灾害与环境研究所_山地表生过程与生态调控重点实验室
作者单位	1.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
推荐引用方式 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.