文献类型：期刊文献

英文题名：Hydrothermal doping method for preparation of Cr³⁺-TiO₂ photocatalysts with concentration gradient distribution of Cr³⁺

作者：Zhu, JF; Deng, ZG; Chen, F; Zhang, JL; Chen, HJ; Anpo, M; Huang, JZ; Zhang, LZ

机构：[1]E China Univ Sci & Technol, Adv Mat Lab, Shanghai 200237, Peoples R China;[2]E China Univ Sci & Technol, Inst Fine Chem, Shanghai 200237, Peoples R China;[3]Osaka Prefecture Univ, Grad Sch Engn, Dept Appl Chem, Sakai, Osaka 5998531, Japan;[4]E China Univ Sci & Technol, Ctr Anal & Testing, Shanghai 200237, Peoples R China

年份：2006

卷号：62

期号：3-4

起止页码：329

外文期刊名：APPLIED CATALYSIS B-ENVIRONMENTAL

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000235265600018)】；

语种：英文

外文关键词：titanium dioxide; photocatalyst; sol-gel; hydrothermal treatment; doping; Cr3+

摘要：Cr3+-doped anatase titanium dioxide photocatalysts were prepared by the combination of sol-gel process with hydrothermal treatment. The samples were characterized by UV-vis diffuse reflectance spectroscopy, X-ray diffraction (XRD), Brunauer-Emmett-Teller (BET) specific surface area (S-BET), transmission electron microscopy (TEM), atomic absorption flame emission spectroscopy (AAS), electron paramagnetic resonance (EPR) spectroscopy and X-ray photoelectron spectroscopy (XPS). It was confirmed that Cr substitutes Ti4+ in TiO2 lattice in trivalent ionic state, and the concentrations of dopants Cr3+ decrease from the exterior to the interior of doped TiO2. The photocatalytic activity of Cr-TiO2 was investigated for the photocatalytic degradation of XRG aqueous solution both under UV and visible light irradiation. Due to the excitation of 3d electron of Cr3+ to the conduction band of TiO2, Cr-TiO2 shows a good ability for absorbing the visible light to degrade XRG. Doping of chromium ions effectively improves the photocatalytic activity under both UV light irradiation and visible light irradiation with an optimal doping concentration of 0.15% and 0.2%, respectively. The special distribution of dopants Cr3+ seems having a good effect on enhancing the photocatalytic activity of Cr-TiO2. (c) 2005 Elsevier B.V. All rights reserved.