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Designer Membrane Tool-box with Mixed Metal Organic Framework and RAFT-synthesized Antibacterial Polymer Perform in Tandem towards Desalination, Antifouling and Heavy Metal Exclusion

Abstract

The main barrier towards quick water remediation in modern membrane based technology is multiple pre-filtration steps which target impurities like pathogens and macromolecules prior to reaching the membrane module. This pre-filtration unit requires frequent replacements, which adds up to the maintenance cost. This study targets key requirements for effective water remediation like stringent bactericidal response, reversible fouling, heavy metal rejection and desalination packed into a single tool-box designed using mixed metal organic framework (MMOF) and reversible addition-fragmentation chain-transfer (RAFT)-synthesized antibacterial polymer from quaternary ammonium compound, hyper branched amine and phosphonium based homo/co-polymers. This module wherein MMOF sandwiched between the active layer (RAFT synthesized polymer) and commercial reverse osmosis membrane work in tandem for effective desalination, antifouling and heavy metal rejection. The selective exclusion of water through nano-channeled MMOF and micro porous active layer led to an unimpeded water flux in the range of 14-24 LMH! The in-vitro cytotoxicity tests on the permeate was assessed using water soluble tetrazolium (WST-1) assay and fluorescence microscopy. A 7-fold bacterial reduction mediated by generation of intracellular reactive oxygen species was observed besides unimpeded permeation of water and excellent anti-fouling properties. With >97 % rejection of divalent and monovalent salts and >95 % rejection of heavy metals, our membranes offer great promise in the domain of water remediation.

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Publication details

The article was received on 30 May 2018, accepted on 23 Jul 2018 and first published on 23 Jul 2018


Article type: Paper
DOI: 10.1039/C8TA05052J
Citation: J. Mater. Chem. A, 2018, Accepted Manuscript
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    Designer Membrane Tool-box with Mixed Metal Organic Framework and RAFT-synthesized Antibacterial Polymer Perform in Tandem towards Desalination, Antifouling and Heavy Metal Exclusion

    P. K. K. Samantaray, S. Baloda, G. Madras and S. Bose, J. Mater. Chem. A, 2018, Accepted Manuscript , DOI: 10.1039/C8TA05052J

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