Journal
MICROPOROUS AND MESOPOROUS MATERIALS
Volume 109, Issue 1-3, Pages 66-72Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.micromeso.2007.04.052
Keywords
anionic surfactant; cosurfactant; mesoporous material; TiO2 nanoparticles
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Mesoporous TiO2 materials have been synthesized with the aid of benzyl alcohol (BA) as cosurfactant along with an anionic surfactant sodium dodecyl sulfate (SDS) as the template/structure directing agent (SDA). The synthesis was carried out both with and without the use of BA in the presence of an anionic surfactant (SIDS) or cationic (cetyltrimethyl ammonium bromide, CTAB) to optimize the synthesis conditions. SDAs were removed from the as-synthesized material through ethanol-acetate extraction or by a newly developed borohydride reduction technique described herein. The resulting materials were characterized by XRD, TEM, FE-SEM, nitrogen sorption, UV-visible and FTIR spectroscopic tools. The use of BA along with SDS assisted the formation of the mesophase, whereas by using SDS alone or by using cationic surfactant CTAB as SDA along with BA, no TiO2 mesophase formation was observed. These mesoporous TiO2 materials showed very high surface area along with the existence of mesopores having broad pore size distributions. A model has been proposed to rationalize the synthesis of mesoporous TiO2 materials by using self-assembly of surfactant (SDS or CTAB) and cosurfactant (BA) mixtures as templates. (C) 2007 Elsevier Inc. All rights reserved.
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