jp5059726_si_001.pdf (268.88 kB)
Vulcanized Ethene-PMO: A New Strategy to Create Ultrastable Support Materials and Adsorbents
journal contribution
posted on 2014-08-07, 00:00 authored by María I. López, Dolores Esquivel, César Jiménez-Sanchidrián, Pascal Van Der
Voort, Francisco J. Romero-SalgueroA periodic mesoporous organosilica
(PMO) functionalized with sulfur units between the organic bridges
has been successfully synthesized by a postsynthetic cold vulcanization
treatment performed on an ethenylene-bridged PMO material (ethene-PMO).
The results of X-ray powder diffraction (XRD), transmission electron
microscopy (TEM), and nitrogen adsorption/desorption porosimetry show
that the resultant materials have well-ordered hexagonal mesoporous
structures with narrow pore size distributions. Moreover, 13C CP/MAS NMR, 29Si MAS NMR, X-ray photoelectron spectroscopy
(XPS), and elemental analysis prove the cross-linking between the
organic moieties through additional sulfur bridges. Besides the incorporation
of a new functionality to this PMO, the vulcanization treatment, reminiscent
of that applied to rubber, improves the thermal and hydrothermal stabilities
of the material. The vulcanized materials were employed as mercury
adsorbents able to be reused without loss of their capacity in repetitive
adsorption tests.