Influence of silver doping on the photocatalytic activity of titania films
Influence of silver doping on the photocatalytic activity of titania films
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DOI：
10.1016/s0169-4332(02)00927-3
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发表时间：
2002-11-15
影响因子：
6.7
通讯作者：
Larbot, A
中科院分区：
文献类型：
--
作者：
He, C;Yu, Y;Larbot, A
通过x射线衍射、BET氮吸附、UV-Vis-NIR透射光谱、透射电镜、扫描电镜、x射线光电子能谱及亚甲基蓝的光降解等手段，研究了Ag掺杂对溶胶-凝胶法制备TiO2膜的微观结构及光催化活性的影响。结果表明，适量（2 ~ 4 mol%）的Ag掺杂剂可提高TiO2薄膜的光催化活性。其机理可归结为：(1)Ag掺杂后锐钛矿晶粒尺寸减小，掺杂TiO2薄膜的比表面积增大，促进了TiO2薄膜中的电荷转移；(2) Ag掺杂剂通过增强电子空穴对的分离和抑制电子空穴对的复合，提高了掺杂TiO2薄膜的电荷对分离效率。(C) 2002 Elsevier Science B.V.版权所有
By means of X-ray diffraction, BET nitrogen adsorption, UV-Vis-NIR transmission spectroscopy, transmission electron microscope, scanning electron microscope, X-ray photoelectron spectroscopy and photodegradation of methylene blue, effects of Ag doping on the microstructure and photocatalytic activity of TiO2 films prepared by sol-gel method were studied. It is found that with a suitable amount (2-4 mol%), the Ag dopant increases the photocatalytic activity of TiO2 films. The mechanism can be attributed to that (1) anatase grain sizes decrease with Ag doping and the specific surface areas of doped TiO2 films increase, the charge transfer in TiO2 films is promoted; (2) by enhancing the electron-hole pairs separation and inhibiting their recombination, the Ag dopant enhances the charge pair separation efficiency for doped TiO2 films. (C) 2002 Elsevier Science B.V. All rights reserved.