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|Title:||New polyoxometalate-functionalized cellulosic fibre/silica hybrids for environmental applications|
|Author:||Gamelas, J. A. F.|
Evtyugina, M. G.
Evtuguin, D. V.
|Publisher:||Royal Society of Chemistry|
|Abstract:||Cellulosic fibre/silica hybrid materials functionalized with Keggin-type polyoxometalates ([PV2Mo10O40]52, [PVMo11O40]42, ([PMo12O40]32 or [PW12O40]32) were prepared by a sol–gel method at room temperature. The novel materials are composed of ca. 56 wt% of polysaccharides, ca. 37 wt% of propylamine-modified silica, 2 wt% of polyoxometalate, and 5% of hydration water. The silica network of these hybrids exhibits relatively high degree of condensation being distributed mainly on the surface of the cellulosic fibres as a dense film. The functionalization of silica with polyoxometalates via electrostatic interactions with protonated propylamino groups of modified silica was unambiguously confirmed. Despite their high silica content cellulose/silica hybrids retained basic cellulosic pulp properties—supramolecular and fibrous structure, porosity, relatively low density, etc. The novel bio-based material functionalized with 2% of [PVMo11O40]42 shows particularly high activity towards the oxidation of volatile organic compounds (VOCs) present in urban air thus anticipating future environmental applications.|
|Appears in Collections:||CESAM - Artigos|
CICECO - Artigos
DAO - Artigos
DQ - Artigos
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|Gamelas et al. - 2012 - New polyoxometalate-functionalized cellulosic fibr.pdf||689.26 kB||Adobe PDF||View/Open|
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