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Synthesis of Amine Functionalized Mesoporous Silicas Templated by Castor Oil for Transesterification

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Abstract

Mesoporous silicas were synthesized via a surfactant-templated sol-gel route using castor oil as the templating agent under acidic medium. The resulting silicas were subsequently amine functionalized with 3-aminopropyltriethoxysilane (NH2-MTS), [3-(2-aminoethylamino)-propyl]trimethoxysilane (NN-MTS), and [3-(diethylamino)propyl]trimethoxysilane(DN-MTS) to introduce surface basicity. Surface physicochemical properties were characterized by field emission gun scanning electron microscopy (FEGSEM), nitrogen porosimetry, X-ray photoelectron spectroscopy (XPS), thermogravimetric analysis (TGA), X-ray diffraction (XRD), and diffuse reflectance infrared fourier transform spectroscopy (DRIFTS). As-synthesised materials exhibit type IV adsorption-desorption isotherms characteristic of mesoporous structures. Clusters of spherical shaped materials were observed by FEGSEM, suggesting growth of silica occurs within colloidal dispersions. High-resolution N 1s XP spectra and DRIFT spectra confirmed the presence of amine groups in the organo-amine functionalised mesoporous silicas. The amine functionalised mesoporous silicas were active for the transesterification of tributyrin with methanol, with conversion found to increase from NH2-MTS< NN-MTS< DN-MTS.

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Authors and Affiliations

  1. Chemistry Department, College of Natural and Applied Sciences, University of Dar es Salaam, Dar es Salaam, Tanzania

    Elianaso Elimbinzi, Stephen S. Nyandoro & Egid B. Mubofu

  2. European Bioenergy Research Institute (EBRI), Aston University, B4 7ET, Aston Triangle, Birmingham, UK

    Amin Osatiashtiani, Jinesh C. Manayil & Mark A. Isaacs

  3. School of Science, RMIT University, VIC3000, Melbourne, Australia

    Adam F. Lee & Karen Wilson

Authors
  1. Elianaso Elimbinzi
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  2. Stephen S. Nyandoro
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  3. Egid B. Mubofu
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  4. Amin Osatiashtiani
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  5. Jinesh C. Manayil
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  6. Mark A. Isaacs
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  7. Adam F. Lee
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  8. Karen Wilson
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Correspondence to Stephen S. Nyandoro.

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Elimbinzi, E., Nyandoro, S.S., Mubofu, E.B. et al. Synthesis of Amine Functionalized Mesoporous Silicas Templated by Castor Oil for Transesterification. MRS Advances 3, 2261–2269 (2018). https://doi.org/10.1557/adv.2018.347

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  • DOI: https://doi.org/10.1557/adv.2018.347

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