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Studies on the properties of RO membranes for salt and boron removal: Influence of thermal treatment methods and rinsing treatments

Chong, C. Y. and Lau, W. J. and Yusof, N. and Lai, G. S. and Othman, N. H. and Matsuura, T. and Ismail, A. F. (2018) Studies on the properties of RO membranes for salt and boron removal: Influence of thermal treatment methods and rinsing treatments. Desalination, 428 . pp. 218-226. ISSN 0011-9164

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Official URL: http://dx.doi.org/10.1016/j.desal.2017.11.009

Abstract

The physicochemical properties and performance of thin film composite (TFC) membranes depend on its synthesis conditions. In this study, TFC membranes were fabricated using interfacial polymerization (IP) method and the effects of heat treatment methods and post-IP rinsing (prior to heat curing step) on the membrane performances were investigated. Keeping the substrate in minimal heat exposure could prevent substrate pore annealing that potentially reduces the membrane water permeability. Evidently, the membranes with only polyamide (PA) layer being heat-treated exhibited > 250% enhancement in pure water flux (PWF) compared to the membranes where both PA and substrate layer were heat-treated. Also, the membranes rinsed with pure n-hexane tended to display higher PWF without significantly decreasing solute rejection, possibly due to the reduced membrane cross-linking following the removal of unreacted monomers and excess solvent from the membrane surface. The membrane performance became practically the same after post-IP rinsing, regardless of the solvent used in the IP reaction, suggesting that the disparity in the membrane performance is mainly caused by the difference in solvent evaporation rate during heat treatment. The variations in solvent surface tension and viscosity during the IP reaction meanwhile did not play a key role affecting PA layer chemistry and performance.

Item Type:Article
Uncontrolled Keywords:Post-IP rinsing, Reverse osmosis
Subjects:T Technology > TP Chemical technology
Divisions:Chemical and Energy Engineering
ID Code:86622
Deposited By: Widya Wahid
Deposited On:30 Sep 2020 16:58
Last Modified:30 Sep 2020 16:58

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