Abstract
Silica–titania mixed oxide were prepared by sol–gel method from tetraethylorthosilicate and titanium (IV) isopropoxide as precursors in the presence of room temperature ionic liquid (RTIL), 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl) imide [C4MIm][NTf2]. The effects of [C4MIm][NTf2] on the structural and textural characteristics of silica–titania matrix are investigated in this paper. The materials obtained were well characterized by Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis X-ray powder diffraction (XRPD), field emission scanning electron microscope (FESEM) and N2 adsorption–desorption analysis. It is believed that the [C4MIm][NTf2] plays an important role as a template and the high surface area of the samples is thought to mainly attribute to the formation of microporous in the reaction. The synthesized materials showed the presence of C–N groups in the FTIR spectrum which indicates the presence of RTIL in the silica–titania matrix. XRPD, FESEM and N2 adsorption–desorption analysis results indicated that the composite materials possessed good microporous character. The subsequent material displayed average pore diameter of 1.70–2.12 nm, pore volume of 0.08–0.19 cm3/g and BET surface area of 191–386 m2/g. Increasing the content of RTIL resulted in an increase of the average pore diameter of the silica–titania gel.
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This work was financially supported by University of Malaya Centre for Ionic Liquids, Postgraduate Research Fund Grant Scheme (PV124-2012A) and High Impact Research Grant HIR MOE (Faculty) F0004-21001 from the Ministry of Higher Education Malaysia. The researcher named Tilagam Marimuthu would like to thank Ministry of Higher Education Malaysia for its financial support through my PhD scholarship.
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Marimuthu, T., Mohamad, S. & Alias, Y. Synthesis and characterization of new silica–titania mixed oxide in the presence of 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl) imide by sol–gel technique. J Sol-Gel Sci Technol 70, 104–110 (2014). https://doi.org/10.1007/s10971-014-3279-7
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DOI: https://doi.org/10.1007/s10971-014-3279-7