New Anatase-Type Ti1−2XNbXAlXO2 Solid Solution Nanoparticles: Direct Formation, Phase Stability, and Photocatalytic Performance
Abstract:New anatase-type titania solid solutions co-doped with niobium and aluminum (Ti1−2XNbXAlXO2 (X = 0 ∼ 0.20)) were synthesized as nanoparticles from precursor solutions of TiOSO4, NbCl5, and Al(NO3)3 under mild hydrothermal conditions at 180 °C for 5 h using the hydrolysis of urea. The lattice parameters a0 and c0 of anatase slightly and gradually increased, when the content of niobium and aluminum increased from X = 0 to 0.20. The crystallite size of anatase increased from 12 to 28 nm with increasing the value of X from 0 to 0.20. Their photocatalytic activity and adsorptivity were evaluated separately by the measurement of the concentration of methylene blue (MB) remained in the solution in the dark or under UV-light irradiation. The adsorptivity of TiO2 was improved by the formation of anatase-type Ti1−2XNbXAlXO2 solid solutions. The photocatalytic activity of anatase-type Ti1−2XNbXAlXO2 solid solutions was superior to that of commercially available anatase-type pure TiO2 (ST-01) and anatase-type pure TiO2 hydrothermally prepared. The new anatase phase of Ti1−2XNbXAlXO2 (X = 0 ∼ 0.20) solid solutions existed stably up to 850 °C during heat treatment in air. In comparison with hydrothermal pure TiO2, the starting temperature of anatase-to-rutile phase transformation was delayed by the formation of Ti1−2XNbXAlXO2 (X = 0 ∼ 0.20) solid solutions, although its completing temperature was accelerated.
Document Type: Research Article
Publication date: 2006-12-01
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