ICCAS OpenIR
Surface modification of TiO2 by phosphate: Effect on photocatalytic activity and mechanism implication
Zhao, Dan1; Chen, Chuncheng1; Wang, Yifeng1; Ji, Hongwei1; Ma, Wanhong1; Zang, Ling2; Zhao, Jincai1
2008-04-17
Source PublicationJOURNAL OF PHYSICAL CHEMISTRY C
ISSN1932-7447
Volume112Issue:15Pages:5993-6001
AbstractPhosphate modified TiO2 photocatalysts were prepared by phosphoric acid treatment before or after TiO2 crystallization. Substrates with different structures were chosen to explore the photocatalytic activity of as-modified TiO2 under UV irradiation. It was found that the effect of phosphate modification is definitely attributed to the surface-bound phosphate anion, and the modification by phosphate can affect both the rates and pathways of photocatalytic reactions, which are of great dependence on the structures and properties of substrates. The degradation of substrates (such as 4-chloropehenol, phenol, and rhodamine B) with weak adsorption on the pure TiO2 was markedly accelerated by phosphate modification, while substrates (such as dichloroacetic acid, alizarin red, and catechol) with strong adsorption exhibited a much lower degradation rate in the phosphate modified system. A much higher amount of hydroxyl radical was produced in phosphate modified system. All of the experimental results imply that phosphate modification largely accelerates the hydroxyl radical attack, but hinders the direct hole oxidation pathway. A common operating mechanism for the phosphate modification, which can be applicable to other inert anions, is also discussed from the viewpoint of an anion-induced negative electrostatic field in the surface layer of TiO2 and the hydrogen bond between modification anion and H2O molecule.
DOI10.1021/jp712049c
Indexed BySCI
Language英语
WOS IDWOS:000254883100045
PublisherAMER CHEMICAL SOC
Citation statistics
Cited Times:212[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.iccas.ac.cn/handle/121111/63618
Collection中国科学院化学研究所
Corresponding AuthorZhao, Jincai
Affiliation1.Chinese Acad Sci, Inst Chem, Key Lab Photochem, Beijing Natl Lab Mol Sci, Beijing 100080, Peoples R China
2.So Illinois Univ, Dept Chem & Biochem, Carbondale, IL 62901 USA
Recommended Citation
GB/T 7714
Zhao, Dan,Chen, Chuncheng,Wang, Yifeng,et al. Surface modification of TiO2 by phosphate: Effect on photocatalytic activity and mechanism implication[J]. JOURNAL OF PHYSICAL CHEMISTRY C,2008,112(15):5993-6001.
APA Zhao, Dan.,Chen, Chuncheng.,Wang, Yifeng.,Ji, Hongwei.,Ma, Wanhong.,...&Zhao, Jincai.(2008).Surface modification of TiO2 by phosphate: Effect on photocatalytic activity and mechanism implication.JOURNAL OF PHYSICAL CHEMISTRY C,112(15),5993-6001.
MLA Zhao, Dan,et al."Surface modification of TiO2 by phosphate: Effect on photocatalytic activity and mechanism implication".JOURNAL OF PHYSICAL CHEMISTRY C 112.15(2008):5993-6001.
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