High flux zwitterionic hybrid cellulose acetate desalination membranes: formation of permeability-effective macropores by self-organizing zwitterionic silanes

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Erkoç İlter, Selda (2023) High flux zwitterionic hybrid cellulose acetate desalination membranes: formation of permeability-effective macropores by self-organizing zwitterionic silanes. Desalination, 551 . ISSN 0011-9164 (Print) 1873-4464 (Online)

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Abstract

Zwitterionic hybrid cellulose acetate membranes with improved flux and antifouling performance were produced by a modified non-solvent induced phase separation (NIPS) process in which a zwitterionic trimethoxysilane compound, (3-sulfopropylbetaine-propyl)-trimethoxysilane (SPPT), was added to the casting solutions at 1.0, 2.0, and 3.0 wt%. The successful incorporation of SPPT into cellulose acetate (CA) membranes was proved by X-ray photoelectron spectroscopy (XPS), scanning electron microscope (SEM), and thermal gravimetric analysis (TGA). Permeate fluxes of the hybrid membranes increased significantly compared to the control cellulose acetate membrane prepared without the addition of SPPT (15 bar pressure; 2000 ppm NaCl or MgSO4 aqueous solution filtration). The hybrid membranes exhibited an increase in permeate flux up to 87 % while their salt rejections slightly decreased in NaCl solution filtration. In MgSO4 solution filtration, the flux was increased by 61 % without sacrificing salt rejection. The reason for the enhancement in the flux was the formation of macropores in the membrane bulk structures by self-organizing zwitterionic silane groups. The highest resistance to bovine serum albumin (BSA) or xanthan gum as a foulant was observed in the hybrid membranes produced with 1.0 wt% of SPPT.
Item Type: Article
Uncontrolled Keywords: Cellulose acetate; Desalination; High-flux; Hybrid membrane; Sol-gel; Zwitterionic silane
Divisions: Integrated Manufacturing Technologies Research and Application Center
Depositing User: Selda Erkoç İlter
Date Deposited: 17 Apr 2023 14:39
Last Modified: 17 Apr 2023 14:39
URI: https://research.sabanciuniv.edu/id/eprint/45387

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