采用溶胶-水热法制备了不同掺杂的二氧化钛纳米粒子,并用表面光电压谱(SPS) 和荧光光谱(PL)等对样品进行了表征,重点考察了La的量和焙烧温度对样品表面光电和光致发光以及光催化活性等的影响,并对它们之间的内在关系进行了探讨.结果表明:在合适的焙烧温度下,适量镧的掺杂能够提高二氧化钛的光催化活性.样品的SPS谱和PL光谱与光催化活性之间存在一定的关系,即SPS和PL信号越强,光生电子和空穴分离效率越高,光催化活性越高.
TiO2 nanoparticles doped with different content of La were prepared by a sol-hydrothermal method, and also
characterized by surface photovoltage spectroscopy (SPS) and photoluminescence (PL) spectra. The effect of La dopant content and
calcination temperature on surface photoelectrical and photoluminescence performance was investigated, and their inherent relationships
discussed. The results show that an appropriate content of La dopant could effectively enhance the photocatalytic activity of TiO2 calcined at
appropriate temperature. Moreover, there are certain relationships among SPS and PL and the activity, i.e., the stronger the SPS and PL signals,
the larger the separation rate of photoinduced electron-hole pairs, the higher the photocatalytic activity of La doped TiO2 nanoparticles.
参考文献
| [1] | Tryk D A, Fujishima A, Honda K. Electrochim Acta, 2000, 45 (15/16): 2363--2375. [2] Murata Y, Fuketa S, Ishikawa S, et al. Sol. Energy Mater. Sol. Cell, 2000, 62 (1/2): 157--165. [3] Hoffman M R, Martin S T, Choi W, et al. Chem. Rev., 1995, 95 (1): 69--96. [4] Litter Marta I. Appl. Cata. B, 1999, 23 (2/3): 89--114. [5] Choi W, Termit A, Hoffmann M R. J. Phys. Chem, 1994, 98: 13669--13675. [6] Chen C C, Li X Z, Ma W H, et al. J. Phys. Chem. B, 2002, 106: 318--327. [7] Liang Jinsheng, et al. 硅酸盐学报(Journal of the Chinese Ceramic Society), 1999, 27 (5): 601--606. [8] Litter M I, Navio J A. J Photochemistry and Phtobiology A, 1996, 98: 171--176. [9] Li X Z, Li F B, Yang C L, et al. Journal of Photochemistry and Photobiology A, 2001, 141: 209--216. [10] Jing L Q, Sun X J, Shang J, et al. Sol. Energy Mater. Sol. Cell, 2003, 79: 133--151. [11] Jing L Q, Sun X J, Cai W M, et al. J. Phys. Chem. Sol., 2003, 64: 615--622. [12] Zhang W F, Zhang M S. Appl. Phys. B, 2000, 70: 261--268. [13] 井立强, 孙晓君, 辛柏福, 等. 材料科学与工艺, 2004, 12 (2): 148--152. [14] Lin Jun, Yu J C. J Photochemistry and Phtobiology A, 1998, 116 (1): 63--67. [15] 高伟, 吴凤清, 罗臻, 等. 高等?学校化学学报, 2001, 22 (4): 660--665. [16] 井立强, 孙晓君, 蔡伟民, 等. 化学学报, 2003, 61 (8): 1451--1456. [17] Zhang L D, Mo C M. Nanostructured Mater, 1995, 6: 831--840. [18] 刘畅, 暴宁钟, 杨祝红, 等. 催化学报, 2001, 22 (2): 215--218. [19] 井立强, 郑莹光, 徐自力, 等. 高等学校化学学报, 2001, 22 (11): 1885--1889. [20] 张立德, 牟季美. 纳米材料和纳米结构[M]. 北京: 科学出版社, 2001. 312. |
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