Y2O3/TiO2 samples were prepared by sol-gel process and characterized by means of X-ray diffraction (XRD), laser Raman spectra (LRS), UV-visible diffuse reflectance spectra (DRS), specific surface area (BET), and transmission electron microscopy (TEM). The results show that the relative intensity of 101 peak of anatase and 002 peak of rutile, the mean crystal diameter and mean particle diameter of Y2O3/TiO2 samples decrease while specific surface area increases owing to doping Y2O3. Y2O3/TiO2 samples have a larger specific surface area and higher thermal stability. Owing to quantum size effect, the reflectance of Y2O3/TiO2 samples is larger than that of pure TiO2 in the range of 380～460 nm and the position of Raman peaks varies slightly. Being a model reaction, the photo-catalytic degradation of methylene blue (MB) with positive charge and methyl orange (MO) with negative charge was investigated in TiO2 and Y2O3/TiO2 nanopowder suspension irradiated by high-pressure mercury lamp. As a result, the addition of Y2O3 to TiO2 is detrimental to photo-activity of TiO2 for MB photo-degradation and photo-catalytic behavior is enhanced due to 5%, 10% Y2O3 deposited on TiO2 for the photo-degradation of MO. And the relationship between photo-physical properties and photo-activity was discussed.
参考文献
| [1] | Hoffmann M R;MARTIN S T;CHIO W Y et al.Environmental application of semiconductor photocatalysis [J[J].Chemical Reviews,1995,95:69-96. |
| [2] | D. Y. Goswami .A Review of Engineering Developments of Aqueous Phase Solar Photocatalytic Detoxification and Disinfection Processes[J].Journal of Solar Energy Engineering,1997(2):101-107. |
| [3] | SUN Feng-yu;WU Ming;LI Wen zhao et al.Relationship between optical surface properties and photocatalytic activity of titanium dioxide[J].催化学报,2002,19(02):121-124. |
| [4] | Bedja I;KAMAT P V .Capped semiconductor colloids: synthesis and photo-electrochemical behavor of TiO2-capped SnO2 nanocrystallites[J].Journal of Physical Chemistry,1995,99:9182-9188. |
| [5] | Engweiler J.;Baiker A.;Harf J. .WOX/TIO2 CATALYSTS PREPARED BY GRAFTING OF TUNGSTEN ALKOXIDES - MORPHOLOGICAL PROPERTIES AND CATALYTIC BEHAVIOR IN THE SELECTIVE REDUCTION OF NO BY NH3[J].Journal of Catalysis,1996(2):259-269. |
| [6] | WONG W K;MALATI M A .Doped TiO2 for solar energy applications[J].Solar Energy,1986,36:163-168. |
| [7] | XIANZHI FU;LOUIS A. CLARK;QING YANG;MARC A. ANDERSON .Enhanced Photocatalytic Performance of Titania-Based Binary Metal Oxides: TiO_2/SiO_2 and TiO_2/ZrO_2[J].Environmental Science & Technology: ES&T,1996(2):647-653. |
| [8] | Alemany LJ.;Ferlazzo N.;Forzatti P.;Busca G.;Giamello E. Bregani F.;Lietti L. .REACTIVITY AND PHYSICOCHEMICAL CHARACTERISATION OF V2O5-WO3/TIO2 DE-NOX CATALYSTS[J].Journal of Catalysis,1995(1):117-130. |
| [9] | LI Fang-bai;GU Guo-bang;LI Yong-jin .Enhanced rates of photocatalytic behavior using WO3/TiO2 coupled semiconductor nanopowder[J].Environmental Science(in Chinese),1999,20:75-78. |
| [10] | LI Fang-bai .The preparation, characterization of modified titanium dioxide and its application of photo-catalytic degradation of dyes wastewater[D].Guangzhou: South China University of Technology,1999. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%