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Turkish Journal of Chemistry

Abstract

A synthesized zwitterionic monohydroxyl monomer (ZHM) was used as an additive to incorporate zwitterionic sulfobetaine groups into the polyamide (PA) active layers of thin-film composite membranes. Incorporation of ZHM into the PA active layers was achieved through interfacial polymerization, involving the introduction of ZHM and m-phenylenediamine (MPD) into the aqueous phase, and the addition of trimesoyl chloride (TMC) to the hexane phase. The surfaces of the resulting reverse osmosis (RO) membranes were subjected to characterization through water contact angle (WCA) and field emission scanning electron microscopy (FESEM) analyses. The successful incorporation of ZHM into the active PA layers was confirmed by X-ray photoelectron spectroscopy (XPS) and Fourier transform infrared spectroscopy (FTIR) analysis. To assess the flux and salt rejection performance of the fabricated membranes, aqueous solutions containing 2000 ppm NaCl or MgSO4 were filtered in a dead-end filtration system under a pressure of 15 bar. Compared to the control membrane (ZHM-0), the ZHM-modified membranes had significantly enhanced flux without compromising salt retention. In the NaCl solution filtration, the modified membrane (ZHM-1) increased in flux from 6.8 to 9.1 L/m2h while having similar salt rejection (approximately 91%) in comparison to the control membrane (ZHM-0). In the MgSO4 solution filtration, the modified membranes increased in flux from 6.7 to 9.5 L/m2h, while maintaining a consistent salt rejection rate of 100%, mirroring that of the control membrane.

Author ORCID Identifier

SELDA ERKOÇ İLTER: 0000-0002-3474-0221

DOI

10.55730/1300-0527.3740

Keywords

Desalination, reverse osmosis, zwitterionic hydroxyl monomer, thin-film composite, high flux, polyamide membrane

First Page

404

Last Page

418

Publisher

The Scientific and Technological Research Council of Türkiye (TÜBİTAK)

Creative Commons License

Creative Commons Attribution 4.0 International License
This work is licensed under a Creative Commons Attribution 4.0 International License.

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