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Cross-linked Hybrid Nanofiltration Membrane with Antibiofouling Properties and Self-Assembled Layered Morphology

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journal contribution
posted on 21.02.2016, 16:18 authored by Ajay K. Singh, S. Prakash, Vaibhav Kulshrestha, Vinod K. Shahi
A new siloxane monomer, 3-(3-(diethoxy­(2-(5-(4-(10-ethoxy-4-hydroxy-2,2-dimethyl-11-oxa-2-ammonio-6-aza-10-silatridecan-10-yl)­phenyl)-1,3,4-oxadi azol-2-ylthio)­ethyl)­silyl)­propylamino)-2-hydroxy-N,N,N-trimethylpropan-1-aminium chloride (OA), was synthesized by reported 3-((4-(5-(2-((3-aminopropyl) diethoxysilyl)­ethylthio)-1,3,4-oxadiazol-2-yl)­phenyl) diethoxysilyl)­propan-1-amine (APDSMO) and glycidyltrimethylammonium chloride (GDTMAC) by epoxide ring-opening reaction. OA-poly­(vinyl alcohol) (PVA) hybrid antibiofouling nanofilter (NF) membranes were prepared by acid-catalyzed sol–gel followed by formal cross-linking. Membranes showed wormlike arrangement and self-assembled layered morphology with varying OA content. Hybrid NF membrane, especially OA-6, showed low surface roughness, high hydrophilic nature, low biofouling, high cross-linking density, thermal and mechanical stablility, solvent- and chlorine-tolerant nature, along with good permeability and salt rejection. Prepared OA-6 hybrid NF membrane can be used efficiently for desalting and purification of water with about 2.0 g/L salt content (groundwater in major part of India). The described method provides novel route for producing antibiofouling membranes of diversified applications.