GIEC OpenIR  > 中国科学院广州能源研究所
Effect of surface state properties of modified TiO2 powders on their photo-catalytic activity
Li, FB; Li, XJ; Li, XZ; Hou, MF; Wang, LY
2002-08-01
Source PublicationTRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
Volume12Issue:4Pages:707-711
AbstractWith an attempt to investigate the effect of gold impurity and tungsten oxide on the recombination and separation of electron-hole pairs, and disclose the effect of surface state on the photo-catalytic activity of TiO2, an innovative photo-catalyst 3% WO3/0.5%Au3+/TiO2 was prepared by means of sol-gel method. The photo-oxidation efficiency of photo-catalyst was evaluated by conducting a set of experiments to photo-degrade methylene blue (MB) in aqueous solution. The surface state properties were examined by means of surface photovoltage spectra (SPS) and electron-field-induced SPS (EFISPS). The experiments demonstrate that the strongest peak is attributed to electron excited from valence band to conduction band and the second strongest peak is attributed to electron excited from valence band to oxygen molecular for all samples. Electron is trapped by O-2 absorbed on the surface of TiO2. And,the surface state of O-2(-) forms. For (1%, 3%)Au3+/TiO2 sample, two new peaks that significantly present at 414 nm and 400 nm respectively should be attributable to gold impurity energy level. And for tungsten oxides doping samples, 4 peaks that significantly present in the region of 500similar to800 nm should be attributable to tungsten impurity energy level. The intensity of EFISPS decreases with increasing the content of gold ion or tungsten oxide when its content is no more than their optimal dosage. However, when the content of gold ion or tungsten oxide is more than their optimal dosage, impurity energy level becomes recombination center from separation center and the intensity of all peaks increases for them.
SubtypeArticle
KeywordSurface State Titanium Dioxide Tungsten Oxide Surface Photovoltage Spectra Methylene Blue Gold Ion
WOS HeadingsScience & Technology ; Technology
WOS Subject ExtendedMetallurgy & Metallurgical Engineering
WOS KeywordVISIBLE-LIGHT IRRADIATION ; PHOTOCATALYTIC ACTIVITY ; SEMICONDUCTOR NANOPOWDER ; BEHAVIOR ; FILM
Indexed ByISTP ; SCI
Language英语
WOS SubjectMetallurgy & Metallurgical Engineering
WOS IDWOS:000177317200031
Citation statistics
Document Type期刊论文
Identifierhttp://ir.giec.ac.cn/handle/344007/10448
Collection中国科学院广州能源研究所
Affiliation1.Guangdong Inst Eco Environm & Soil Sci, Guangdong Key Lab Agr Environm Pollut Integrated, Guangzhou 510650, Peoples R China
2.Chinese Acad Sci, Guangzhou Inst Energy Convers, Guangzhou 510070, Peoples R China
3.Hong Kong Polytech Univ, Dept Civil & Struct Engn, Kowloon, Hong Kong, Peoples R China
Recommended Citation
GB/T 7714
Li, FB,Li, XJ,Li, XZ,et al. Effect of surface state properties of modified TiO2 powders on their photo-catalytic activity[J]. TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA,2002,12(4):707-711.
APA Li, FB,Li, XJ,Li, XZ,Hou, MF,&Wang, LY.(2002).Effect of surface state properties of modified TiO2 powders on their photo-catalytic activity.TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA,12(4),707-711.
MLA Li, FB,et al."Effect of surface state properties of modified TiO2 powders on their photo-catalytic activity".TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA 12.4(2002):707-711.
Files in This Item:
There are no files associated with this item.
Related Services
Recommend this item
Bookmark
Usage statistics
Export to Endnote
Google Scholar
Similar articles in Google Scholar
[Li, FB]'s Articles
[Li, XJ]'s Articles
[Li, XZ]'s Articles
Baidu academic
Similar articles in Baidu academic
[Li, FB]'s Articles
[Li, XJ]'s Articles
[Li, XZ]'s Articles
Bing Scholar
Similar articles in Bing Scholar
[Li, FB]'s Articles
[Li, XJ]'s Articles
[Li, XZ]'s Articles
Terms of Use
No data!
Social Bookmark/Share
All comments (0)
No comment.
 

Items in the repository are protected by copyright, with all rights reserved, unless otherwise indicated.