Aniline adsorption and polymerization over gallium modified mesoporous material.
Date
2018
Journal Title
Journal ISSN
Volume Title
Publisher
Univesidsad Tecnológica Nacional.
Abstract
In this work we study aniline polymerization over a mesoporous Ga-SBA-3 synthesized in our
laboratory. In order to modify the intrinsic acidity of the mesoporous material gallium was
incorporated into the structure by post synthesis wet impregnation method using gallium nitrate.
Structural and textural characterization of the materials was performed by X-ray diffraction
(XRD), ICP and EDX analysis, N2 adsorption-desorption and BET area analysis, FTIR and
scanning electron microscopy (SEM). The catalytic material presented a ratio Si/Ga=32.
Aniline is a weak organic base and an amphiprotic compound, so it can accept or donate protons.
The polyaniline (PANI) exists in diverse ways presenting different chemical and physical
properties. The protonated polyaniline feature the conductivity of a semiconductor material, over
100 S/cm.
Toward achieve aniline adsorption, the solid gallium silicate was exposed to aniline vapours.
The aniline adsorption was studied by infrared spectroscopy and the results obtained were
evaluated so as to been able to polymerize it over the mesoporous material generating a unique
polyaniline-host composite with new properties. Those polyaniline/hosts composites obtained by
a polymerization in-situ technique were characterized by infrared spectroscopy (FTIR) and X-ray
diffraction (XRD) analysis. Comparing to previous results FTIR analysis of the polyaniline/Ga SBA-3 composite (PANI/Ga-SBA-3) showed characteristics bands attributed to the quinoidal
stretching (N=Q=N) and C-C stretching of the benzene ring. The low angle XRD analysis showed
that the mesoporous structure was maintained in spite of the gallium incorporation. The absence
of PANI peaks and G2O3 in the wide angle XRD pattern confirms that the polyaniline is adsorbed
over the gallium silicate mesoporous surface and the gallium is well dispersed over the support.
Description
Keywords
Aniline, Adsorption, Galium modified
Citation
XXVII International Materials Research Congress.