Perm-selective ultrathin high flux microporous polyaryl nanofilm for molecular separation.

ABSTRACT: Polymeric membranes with high permeance and selectivity performances are anticipated approach for water treatment. Separation membranes with moderate molecular weight cut-offs (MW in between 400 and 700 g mol^-1) are desirable to separate multivalent ions and small molecules from a water stream. This requires polymeric membranes with controlled pore, pore size distribution, surface charge, and thin active layer to maximize membrane performance. Here, a fabrication of the polyaryl nanofilm with thickness down to ∼15 nm synthesized using interfacial polymerization onto ultrafiltration supports is described. Electron microscopy analysis reveals the presence of crumpled surface morphology in polyaryl nanofilm. Polyaryl nanofilm shows high water permeance of ∼110 Lm^-2h^-1 bar^-1. Polyaryl nanofilm presents molecular weight cut-off greater than ∼450 gmol^-1 (molecular marker) with water permeance of ∼84 Lm^-2h^-1 bar^-1. Multivalent salt (K₃[Fe(CN)₆]) has higher rejection (>95%) as compared to the monovalent (∼5%) and divalent salt (∼28%) with the water permeance of ∼81 Lm^-2h^-1 bar^-1.

SUBMITTER: Kaushik A 

PROVIDER: S-EPMC9167968 | biostudies-literature | 2022 Jun

REPOSITORIES: biostudies-literature