Enhanced flux and fouling resistance forward osmosis membrane based on a hydrogel/MOF hybrid selective layer
Journal of Colloid and Interface Science(2021)
Abstract
Although forward osmosis (FO) technology has been widely adopted for water treatment, it still faces great challenges, including low permeability and fouling problem. Herein, a novel forward osmosis membrane was developed with a stable, uniform and defect-free polyvinyl alcohol/polydopamine coated zeolitic imidazolate framework (PVA/PDA@ZIF-8) hybrid selective layer to simultaneously enhance its transport property and fouling resistance. The prepared FO membrane exhibits improved water flux without losing the selectivity, since the PDA@ZIF-8 provide additional preferential passageway for water transporting while hinder the diffusion of salt. The optimized membrane shows a higher water flux than pristine PVA membrane (14.2 vs. 8.7 L m−2 h−1 in FO mode, 24.3 vs. 14.8 L m−2 h−1 in PRO mode) with a reasonable selectivity considering as Js/Jw value (0.44 vs. 0.4 g L−1 in FO mode, 0.38 vs. 0.33 g L−1). Moreover, the dynamic fouling experiments with organic foulants (protein and polysaccharide) indicate that the prepared membrane exhibits strong antifouling property and excellent permeation recovery ability (>95.0%) due to the optimized surface property. This study opens a new avenue for treatment wastewater by developing a forward osmosis membrane based on a hydrogel/MOF hybrid selective layer.
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Key words
Forward osmosis,Poly (vinyl alcohol),ZIF-8,Polydopamine,Antifouling
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