This work focuses on the preparation of porous mixed matrix membranes (MMMs) by non-solvent
induced phase separation (NIPS) using poly(vinylidenefluoride) (PVDF) as polymer and nano-sized silicalite-1
(S-1) and Ti-silicalite-1 (TS-1) seeds of MFI zeolite structure as inorganic fillers. These MMMs
have been used as VOCs adsorbers. Different zeolite seed concentrations (up to 22 wt.%) were homogeneously
dispersed into the polymeric matrix to evaluate the influence of the amount of zeolites on the
membrane characteristics. In all cases, asymmetric porous membranes, made up of two layers were
obtained: the bottom side exhibited spherulitic structure; whereas, at the top side, a smooth layer was
observed. With respect to the neat PVDF membranes, the hydrophobic character was found to be
improved by the zeolite addition; in particular S-1 nano-seeds. The mechanical properties of the
membranes were reduced by the addition of the filler, although the mechanical resistance of the MMMs
was still sufficiently preserved. Experiments of hexane adsorption were carried out in order to evaluate
the performance of the adsorbers in Volatile Organic Compounds (VOCs) removal. The as-prepared
composite porous membranes revealed high adsorption capacity, confirming their potential as adsorbers
for removing VOCs traces from waste air environment.
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