Abstract
In recent years, lamellar membranes composed of 2D materials have drawn attention for membrane separation, as these contain nanoscale capillaries suitable to reject hydrated ions present in sea water. Slight surface chemistry modification of such nanoscale capillaries has been observed to further enhance the ion sieving effect. Herein, we report on a biofunctionalized WS2 membrane which consists of peptide-intercalated layer-stacked porous WS2 nanosheets. The intercalated peptides are responsible to modify the surface chemistry of nano-channels. The performance in terms of both ion sieving and water permeance of the membrane is found to be improved after peptide intercalation when tested under different electro-kinetic driving forces (concentration gradient and pressure difference). The membrane excludes ∼ 99 % of the salt ions (Na+, K+, Cl-, Mg+2) while maintaining higher water permeance than the industrialized membrane. The membrane is also found to be highly stable under aqueous medium and does not swell when used for longer period of time. Moreover, the membrane is tested for antifouling resistance and more than 85 % flux recovery rate is observed. This membrane works good in different pH values as well. These results suggest applicability in water purification systems.
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