Li-doped nanosized TiO2 powder with enhanced photocalatylic acivity under sunlight irradiation

• Published in: Applied organometallic chemistry 2010-10, Vol.24 (10), p.692-699
• Main Authors: Bouattour, Soraa, Kallel, Wannes, Botelho do Rego, Ana Maria, Vieira Ferreira, L.F., Machado, I. Ferreira, Boufi, Sami
• Format: Article
• Language: English
• Subjects: Degradation; doped; Excitation; Nanostructure; Phases; Photocatalysis; photocatalyst; Sol gel process; Sunlight; TiO2; Titanium dioxide
• ISSN: 0268-2605; 1099-0739; 1099-0739
• DOI: 10.1002/aoc.1668

This work reports on the synthesis of Li‐doped TiO2 nanoparticles using the sol–gel process and solid‐state sintering, and investigates their potential use as a photocatalyst for degradation under sunlight excitation of different organic model compounds in aqueous solution. The structure of the nanocrystals was examined by X‐ray diffraction, UV‐vis ground state diffuse reflectance absorption spectra and X‐ray photoelectron emission spectroscopy. Results showed that samples prepared by sol–gel process and calcined at 400 °C are composed of a mixture of anatase and rutile phases, in contrast to the one prepared by solid‐state sintering, which exhibits an anatase phase with Li being involved in a spinel phase. The photocatalytic degradation of aqueous solutions of different aromatic compounds was successfully achieved under sunlight excitation in presence of Li‐doped TiO2 prepared via sol–gel process. It was shown that the calcination temperature and the preparation mode greatly affect the photocatalytic efficiency. Copyright © 2010 John Wiley & Sons, Ltd. Schematic illustration showing the mechanism of the photocatalytic degradation under sunlight of TiO2 nanoparticles doped with 1% Li