Indirect quantitative IR assessment of maximal monomolecular deposition of 3-aminopropyltrimethoxysilane on silica gel surface

Authors

  • Miha Bukleski Institute of Chemistry, Faculty for Natural Sciences and Mathematics, Ss. Cyril and Methodius University, Skopje
  • Vladimir Ivanovski Institute of Chemistry, Faculty for Natural Sciences and Mathematics, Ss. Cyril and Methodius University, Skopje

DOI:

https://doi.org/10.20450/mjcce.2014.601

Keywords:

3-aminopropyltrimethoxysilane (APTMS), chemisorption, DRIFT spectra, modified silica gel

Abstract

Quantification of the amount of maximum loaded 3-aminopropyltrimethoxysylil (APS) on a thermally pretreated silica gel (600 ºC) was performed using IR spectroscopy. A possibility to find the maximum load through a construction of a Langmuir isotherm was not possible due to the irreversibility of the chemisorption reaction. The method used in this work was based on the analysis of the toluene solution on the quantity of the non-reacted APTMS after the saturation of the silica gel surface with APS. The process of chemisorption was monitored via the increasing band intensity of CH2 and NH­2 modes of the adsorbent and decreasing band intensity characteristic for the free isolated OH groups of silica gel using DRIFT spectroscopy. The obtained results on maximum adsorption are in line with the previously obtained, using carbon elemental analysis and a direct DRIFT method.

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Published

2014-12-01

How to Cite

Bukleski, M., & Ivanovski, V. (2014). Indirect quantitative IR assessment of maximal monomolecular deposition of 3-aminopropyltrimethoxysilane on silica gel surface. Macedonian Journal of Chemistry and Chemical Engineering, 33(2), 267–275. https://doi.org/10.20450/mjcce.2014.601

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Section

Spectroscopy

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