以TiCl4为前驱体,采用环氧丙烷快速成胶法合成了具有高光催化活性的纳米晶TiO2气凝胶,利用X射线衍射、N2物理吸附和透射电镜等手段考察了H2O/TiCl4摩尔比和热处理等制备参数对TiO2气凝胶织构性质的影响,并以苯酚的光催化降解为模型反应评价了样品的光催化活性. 结果表明, H2O/TiCl4摩尔比为3时体系的成胶过程较为缓慢,制备的纳米晶TiO2气凝胶样品具有最小的晶粒尺寸及最大的比表面积和孔容,并且具有最佳的光催化活性.
The nanocrystalline TiO2 aerogel was prepared by a novel epoxide-mediated non-alkoxide sol-gel method, and the catalyst was characterized by X-ray diffraction, N2 adsorption and transmission electron microscopy. The influence of the preparation conditions on the textural properties of the TiO2 aerogels was investigated, and the catalyst activity was tested by using phenol degradation as the model reaction. When H2O/TiCl4 molar ratio is 3, the prepared TiO2 aerogel has the smallest crystallite size and the biggest surface area, and the catalyst shows the highest activity for phenol degradation.
参考文献
| [1] | Fox M A;Dulay M T .[J].Chemical Reviews,1993,93(01):341. |
| [2] | Ohtani B;Ogawa Y;Nishimoto S .[J].Journal of Physical Chemistry B,1997,101(19):3746. |
| [3] | Dagan G;Tomkiewicz M .[J].Journal of Physical Chemistry,1993,97(49):12651. |
| [4] | Kapoor PN;Uma S;Rodriguez S;Klabunde KJ .Aerogel processing of MTi2O5 (M = Mg, Mn, Fe, Co, Zn, Sn) compositions using single source precursors: synthesis, characterization and photocatalytic behavior[J].Journal of molecular catalysis, A. Chemical,2005(1/2):145-150. |
| [5] | Li H X;Zhu J;Li G Sh;Wan Y .[J].Chemistry Letters,2004,33(05):574. |
| [6] | Kolen'ko YV;Garshev AV;Churagulov BR;Boujday S;Portes P;Colbeau-Justin C .Photocatalytic activity of sol-gel derived titania converted into nanocrystalline powders by supercritical drying[J].Journal of Photochemistry and Photobiology, A. Chemistry,2005(1):19-26. |
| [7] | Schneider M;Baiker A .[J].Catalysis Today,1997,35(03):339. |
| [8] | Suh DJ .Catalytic applications of composite aerogels[J].Journal of Non-Crystalline Solids: A Journal Devoted to Oxide, Halide, Chalcogenide and Metallic Glasses, Amorphous Semiconductors, Non-Crystalline Films, Glass-Ceramics and Glassy Composites,2004(0):314-319. |
| [9] | Campbell L K;Na B K;Ko E I .[J].Chemistry of Materials,1992,4(06):1329. |
| [10] | Zhang Y H;Xiong G;Yao N;Yang W Fu X .[J].Catalysis Today,2001,68(1-3):89. |
| [11] | Navío J A;Colón G;Macías M;Real C Litter M I .[J].Applied Catalysis A:General,1999,177(01):111. |
| [12] | Niederberger M.;Bartl MH.;Stucky GD. .Benzyl alcohol and titanium tetrachloride - A versatile reaction system for the nonaqueous and low-temperature preparation of crystalline and luminescent titania nanoparticles[J].Chemistry of Materials,2002(10):4364-4370. |
| [13] | Gash AE.;Satcher JH.;Poco JF.;Hrubesh LW.;Simpson RL.;Tillotson TM. .Use of epoxides in the sol-gel synthesis of porous iron(III) oxide monoliths from Fe(III) salts[J].Chemistry of Materials,2001(3):999-1007. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%