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论文类型：期刊论文

发表时间：2010-03-01

发表刊物：CERAMICS INTERNATIONAL

收录刊物：SCIE

卷号：36

期号：2

页面范围：443-450

ISSN号：0272-8842

关键字：SiO32- doped TiO2 films; Hydro-thermal synthesis methord; Photocatalytic activity; Red shift

摘要：SiO32- doped TiO2 films with oriented nanoneedle and nanorectangle block structure has been firstly synthesized by hydrothermal synthesis method. The prepared samples are characterized, X-ray diffraction (XRD) results demonstrate that the SiO32- doped TiO2 films are rutile and brookite phases. The scanning electron microscope (SEM) analysis reveals that the quantity Of O-2 affects the morphology of the SiO32- doped TiO2 films (SiTiA films prepared with unmodified substrate). The SiO32- doped TiO2 films (SiTiB films prepared with modified substrate) display two layers, one is porous structure, the other is nanoneedle structure. UV-vis, IR, transmission electron microscopy (TEM) and energy-dispersive Xray (EDX) microscopy all prove that SiO32- have been doped in the TiO2 crystal structure. They have remarkable red shift and higher photocatalytic activity of degradation of methylene blue than P-25 under visible light (lambda > 420 nm) irradiation. Besides, photocatalytic activity of the film is stable during 4 times recycling. (C) 2009 Elsevier Ltd and Techna Group S.r.l.. All rights reserved.