用溶胶-凝胶法制得复合半导体WP3-TiO2,用浸渍法制得Cu/WO3-TiO2光催化剂.利用XRD、Raman、TPR、IR、TEM、XPS和UV-Vis等技术研究了Cu/WO3-TiO2 的物相结构、微粒尺寸和吸光性能.结果表明:含量为10wt%的WO3单分子层分散在TiO2 表面,粉体平均粒径15nm.WO3的引入使TiO2吸收限发生明显蓝移,WO3负载量超过单分子层分散(>10wt%),有晶相WO3生成,光吸收性能下降.W-O-Ti键的形成加强了半导体之间的相互作用,有利于光生载流子在半导体间的输送.负载金属Cu促进四面体配位W向八面体配位W转化.
The solid material of coupled semiconductor WO3-TiO2, was prepared by a sol-gel method. The photocatalyst WO3-TiO2 supported metallic Cu was prepared by an isovolumic impregnation method. The surface structure, particle size and photo absorption performance of the materials were characterized by XRD, Raman, TPR, IR, TEM, XPS and UV-Vis. The experiment results show that 10wt%WO3 disperses on the surface of TiO2 support with one monolayer of non-crystalline phase, average particle size of 1wt%Cu/10wt%WO3-TiO2 is about 15nm. Blue shifting of photo absorption edges is observed clearly after the addition of WO3 on the surface of TiO2. The lattice WO3 forms and photo absorption performance decreases when the supporting amount of WO3 is more than that of the monolayer phase(>10wt%). The formation of bond W-O-Ti in the solid systems promotes the transfer of generating charge carriers between WO3 and TiO2. Loaded metalic Cu accelerates the transformation from the tetrahedrally coordinated W species to the octahedrally coordinated W species.
参考文献
| [1] | Tryk D A, Fujishima A, Honda K. Electrochimica. Acta., 2000, 45 (15/16): 2363-2376. [2] Linsebigler A L, Lu G, Yates J T Jr. Chem. Rev., 1995, 95 (3): 735-758. [3] 姜洪波, 高濂, 张青红(JIANG Hong-Bo, et al). 无机材料学报(Journal of Inorganic Materials), 2003, 18 (3): 695-699. [4] Gouvea C A K, Wypych F, Moraes S G. Chemosphere., 2000, 40 (4): 427-432. [5] Young T K, Kang Y S, Wan I L. J. Catal., 2000, 191 (1): 192-199. [6] 柳清菊, 杨喜昆, 刘强(LIU Qing-Ju, et al). 无机材料学报(Journal of Inorganic Materials), 2004, 19 (1): 140-146. [7] Bates C W Jr. Materials. Letters., 1995, 23 (1-3): 1-5. [8] Yang J J, Li D X, Zhang Zh J, et al. J. Photochemistry and Photobiology A., 2000, 137 (2/3): 197-202. [9] Vermaire D C, Berge P C. J. Catal., 1989, 116 (2): 309-317. [10] 陈崧哲, 钟顺和(CHEN Song-Zhe, { et al). 应用化学(Chin Appl Chem), 2003, 20 (1): 23-28. [11] Benitez V M, Querini C A, Figoli N S. Appl. Catal., 2003, 252 (2): 427-436. [12] Huang Y Y, Zhao B Y, Xie Y C. Appl. Catal., 1998, 171 (1): 75-83. [13] Moulder J F, Stickle W F, Spbol P E, et al. Handbook of X-Ray Photoeletron Spectroscopy, USA: Perkin-Elmer Corp, 1992. 220. |
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