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Charge tunable thin-film composite membranes by gamma-ray triggered surface polymerization

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Version 2 2024-06-03, 08:21
Version 1 2017-08-01, 14:49
journal contribution
posted on 2024-06-03, 08:21 authored by R Reis, MC Duke, BL Tardy, D Oldfield, RR Dagastine, JD Orbell, LF Dumée
Thin-film composite poly(amide) (PA) membranes have greatly diversified water supplies and food products. However, users would benefit from a control of the electrostatic interactions between the liquid and the net surface charge interface in order to benefit wider application. The ionic selectivity of the 100 nm PA semi-permeable layer is significantly affected by the pH of the solution. In this work, for the first time, a convenient route is presented to configure the surface charge of PA membranes by gamma ray induced surface grafting. This rapid and up-scalable method offers a versatile route for surface grafting by adjusting the irradiation total dose and the monomer concentration. Specifically, thin coatings obtained at low irradiation doses between 1 and 10 kGy and at low monomer concentration of 1 v/v% in methanol/water (1:1) solutions, dramatically altered the net surface charge of the pristine membranes from -25 mV to +45 mV, whilst the isoelectric point of the materials shifted from pH 3 to pH 7. This modification resulted in an improved water flux by over 55%, from 45.9 to up 70 L.m-2.h-1, whilst NaCl rejection was found to drop by only 1% compared to pristine membranes.

History

Journal

Scientific reports

Volume

7

Article number

4426

Pagination

1-10

Location

London, Eng.

eISSN

2045-2322

Language

eng

Publication classification

C1 Refereed article in a scholarly journal

Copyright notice

2017, The Author(s)

Publisher

Nature

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