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Mesoporous titanosilicates with high loading of titanium synthesized in mild acidic buffer solution

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Abstract.
Mesoporous titanosilicates with high titanium content were synthesized under mild acidic conditions
(pH = 4.4, HAc–NaAc buffer solution) by co-condensation of acetylacetone-modified titanium isopropoxide
(Ti(OBun)3 (acac)) and mixture of sodium silicate with tetramethoxysilane (TMOS) or tetraethoxysilane
(TEOS) or tetrakis(2-hydroxyethyl)orthosilicate (EGMS), using block copolymer Pluronic P123 as
template. The combined results of XRD, N2 sorption and TEM show that the highly regular structure of
the mesoporous titanosilicates can still be obtained when Ti/Si molar ratio in the final product is as high
as 0.059. The results of UV–vis diffuse reflectance spectra and UV resonance Raman spectra show that the
framework titanium species are predominant in the mesoporous titanosilicates when Ti/Si molar ratio in
the final product is less than 0.042. The mixture of sodium silicate and EGMS was proved to be the best
silicon source for the synthesis of titanosilicates with ordered mesostructure and high titanium content.
The efficiency of this synthetic method may be attributed to the mild acidic medium as well as the modified
hydrolysis–condensation rate and hydrophility of the precursors.

Keywords:
Mesoporous titanosilicates
Buffer solution
Ti-SBA-15
Framework titanium species
UV resonance Raman

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Informasi Detail

Judul Seri

Journal of Colloid and Interface Science

No. Panggil

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Penerbit

London : Elsevier Inc.., 2009

Deskripsi Fisik

Journal of Colloid and Interface Science 335 (2009) 203–209

Bahasa

English

ISBN/ISSN

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Klasifikasi

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Tipe Isi

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Tipe Media

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Tipe Pembawa

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Edisi

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Subjek

KIMIA

Info Detail Spesifik

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Pernyataan Tanggungjawab

agus

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