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Visible―light Photocatalytic Activity of Sn2+―doped TiO2 and Its Loading Effect on Mesoporous Montmorillonite

Author(s): LI Fang-Fei, YANG Dian-Fan, XIA Mao-Sheng, WANG Yan, JIANG Yin-San

Journal: Journal of Inorganic Materials
ISSN 1000-324X

Volume: 26;
Issue: 9;
Start page: 917;
Date: 2011;
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Keywords: Sn-doped TiO2; visible-light photocatalytic activity; mesoporous montmorillonite; loading

Two different tin salts, SnCl2.2H2O and SnCl4.5H2O, were employed in the synthesis of Sn―doped TiO2. And the crystal structures and visible―light photocatalytic activities between Sn2+―doped TiO2 and Sn4+―doped TiO2 were compared. The results show that both the anatase―to―rutile phase transformation temperature and the crystal growth of TiO2 are remarkably decreased by Sn dopant, and the Sn2+ dopant shows the higher efficiency than Sn4+ dopant. And despite the similar spectra of XRD and FTIR, Sn2+―doped TiO2 displays higher visible―light photocatalytic activities than Sn4+―doped TiO2, due to the half―filled d electronic orbit of Sn2+. Mesoporous montmorillonite was chosen as the supporting material for Sn2+―doped TiO2, due to its high crystalization and large specific surface area. When Sn2+―doped TiO2 was loaded on mesoporous montmorillonite, the resualtant samples had no significant difference in XRD patterns and FTIR spectra as compared with the supporting material, and no obvious peaks were found related to Sn2+―doped TiO2. While the UV―Vis analysis shows that the adsorption edges of Sn2+―doped TiO2 display red shift after loaded onto mesoporous montmorillonite. As a result, the resultant compound photocatalyst exhibits higher visible―light catalytic activity than unloaded Sn2+―doped TiO2, which is due to the interactions between mesoporous montmorillonite supports and Sn2+―doped TiO2. This might provide a promising way to improve the photocatalytic activity of TiO2 with minimized cost and widened light―response region.
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