Knowledge Management System Of Guangzhou Institute of Energy Conversion, CAS
| 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 Publication | TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
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| Volume | 12Issue:4Pages:707-711 |
| Abstract | With 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. |
| Subtype | Article |
| Keyword | Surface State Titanium Dioxide Tungsten Oxide Surface Photovoltage Spectra Methylene Blue Gold Ion |
| WOS Headings | Science & Technology ; Technology |
| WOS Subject Extended | Metallurgy & Metallurgical Engineering |
| WOS Keyword | VISIBLE-LIGHT IRRADIATION ; PHOTOCATALYTIC ACTIVITY ; SEMICONDUCTOR NANOPOWDER ; BEHAVIOR ; FILM |
| Indexed By | ISTP ; SCI |
| Language | 英语 |
| WOS Subject | Metallurgy & Metallurgical Engineering |
| WOS ID | WOS:000177317200031 |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.giec.ac.cn/handle/344007/10448 |
| Collection | 中国科学院广州能源研究所 |
| Affiliation | 1.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. |
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