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Phase development and photocatalytic ability of gel-derived P-doped TiO2

Published online by Cambridge University Press:  31 January 2011

Hsuan-Fu Yu
Hsuan-Fu Yu*
Affiliation:
Department of Chemical and Materials Engineering, Tamkang University Tamsui, Taipei Hsien, Taiwan 25137
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

P-doped titanium dioxide (TiO2) nanoparticles were synthesized using a sol-gel method. The ethanol solution of Ti(OC2H5)4 was mixed with an aqueous solution of H3PO4 to undergo hydrolysis and polycondensation at 90 °C for 4 h. The resultant solids were centrifugally filtered, dried, and then calcined at different temperatures, followed by chemical and physical characterization. At an atomic ratio of P/Ti = 0.03, the formed P-doped TiO2 can preserve its anatase structure at 900 °C for 3 h, with no formation of other phases. Further increasing the P/Ti atomic ratio in the P-doped TiO2 may stabilize the anatase–TiO2 at even higher temperatures but may lead to the formation of TiP2O7 or (TiO)2P2O7. A test of photocatalysis showed that the P-doped TiO2 nanoparticles, with a P/Ti ratio = 0.03 and after being calcined at temperatures between 400 and 800 °C, can decompose ⩾98 mol.% of the methylene blue (MB) after 30 min of irradiation by 365-nm ultraviolet light, while P25 particles can only decompose 71 mol% of the MB.

Keywords

DopantPhase transformationSol-gel
Type
Articles
Information
Journal of Materials Research , Volume 22 , Issue 9 , September 2007 , pp. 2565 - 2572
Copyright
Copyright © Materials Research Society 2007

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