TiO<inf>2</inf>/MgAl layered double hydroxides mechanical mixtures as efficient photocatalysts in phenol degradation

Silvia P. Paredes, Miguel A. Valenzuela, Geolar Fetter, Sergio O. Flores

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Abstract

MgAl layered double hydroxides (MgAl LDH) were synthesized by the solgel method using ultrasound irradiation in the crystallization step. The interlayer anions were nitrate and acetylacetonate-ethoxide. The solids were characterized by XRD, N2-physisorption and TEM. TiO2/MgAl LDH mixtures were prepared by mixing the MgAl LDH (as prepared) or the calcined sample with TiO2 (Aldrich, 99.9% anatase) in different weight ratios. Photocatalytic activities of the TiO2/MgAl LDH mixtures were evaluated through the degradation of phenol as model pollutant. TiO 2/MgAl LDH mixture (1:1) was more photocatalytically active for the degradation of phenol than pure TiO2. The synergy effect was attributed to a higher production of •OH radicals, which were formed from the structural hydroxides. Also, the hydrotalcite phase enhanced the phenol adsorption and transfer to the TiO2 sites where the phenol was photocatalytically degradated. © 2011 Elsevier Ltd.
Original languageAmerican English
Pages (from-to)914-919
Number of pages822
JournalJournal of Physics and Chemistry of Solids
DOIs
StatePublished - 1 Jan 2011

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