abstract
Cellulosic fibre/silica hybrid materials functionalized with Keggin-type polyoxometalates ([PV(2)Mo(10)O(40)](5-), [PVMo(11)O(40)](4-), ([PMo(12)O(40)](3-) or [PW(12)O(40)](3-)) 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 [PVMo(11)O(40)](4-) shows particularly high activity towards the oxidation of volatile organic compounds (VOCs) present in urban air thus anticipating future environmental applications.
keywords
SOL-GEL PROCESS; KEGGIN ANIONS; SILICA; COMPOSITES; SURFACE; CLUSTERS; SPECTROSCOPY; CHEMISTRY; CATALYSIS; ACETATE
subject category
Chemistry
authors
Gamelas, JAF; Evtyugina, MG; Portugal, I; Evtuguin, DV
our authors
Dmitry Evtyugin
Associate Professor with Aggregation
Inês Portugal
Assistant Professor