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

Published online by Cambridge University Press:  10 April 2018

Elianaso Elimbinzi ,
Stephen S. Nyandoro ,
Egid B. Mubofu ,
Amin Osatiashtiani ,
Jinesh C. Manayil ,
Mark A. Isaacs ,
Adam F. Lee  and
Karen Wilson
Elianaso Elimbinzi
Affiliation:
Chemistry Department, College of Natural and Applied Sciences, University of Dar es Salaam, Dar es Salaam, Tanzania
Stephen S. Nyandoro*
Affiliation:
Chemistry Department, College of Natural and Applied Sciences, University of Dar es Salaam, Dar es Salaam, Tanzania
Egid B. Mubofu
Affiliation:
Chemistry Department, College of Natural and Applied Sciences, University of Dar es Salaam, Dar es Salaam, Tanzania
Amin Osatiashtiani
Affiliation:
European Bioenergy Research Institute (EBRI), Aston University, Aston Triangle, Birmingham, B4 7ET, UK
Jinesh C. Manayil
Affiliation:
European Bioenergy Research Institute (EBRI), Aston University, Aston Triangle, Birmingham, B4 7ET, UK
Mark A. Isaacs
Affiliation:
European Bioenergy Research Institute (EBRI), Aston University, Aston Triangle, Birmingham, B4 7ET, UK
Adam F. Lee
Affiliation:
School of Science, RMIT University, Melbourne VIC3000, Australia
Karen Wilson*
Affiliation:
School of Science, RMIT University, Melbourne VIC3000, Australia
*
*Corresponding authors:nyandoro@udsm.ac.tz; samyandoro@yahoo.com; karen.wilson2@rmit.edu.au
*Corresponding authors:nyandoro@udsm.ac.tz; samyandoro@yahoo.com; karen.wilson2@rmit.edu.au
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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.

Keywords

catalyticheterogenousmesoscaleporositysol-gel
Type
Articles
Information
MRS Advances , Volume 3 , Issue 38: African Materials Research Society 2017 , 2018 , pp. 2261 - 2269
Copyright
Copyright © Materials Research Society 2018 

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