Gas and liquid permeation properties of modified interfacial composite reverse osmosis membranes

Louie, Jennifer S.; Pinnau, Ingo; Reinhard, Martin

doi:10.1016/j.memsci.2008.09.006

Cited by 44 publications

(17 citation statements)

References 24 publications

(28 reference statements)

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“…Louie et al [19] investigated such defects, and used gas permeation experiments to confirm their presence. In another study [20], small defects were found in several commercial reverse osmosis membranes. Good membrane performance can only be achieved if the coating conditions are optimized for the specific supports and monomers [21] and by varying the MPD and TMC concentrations, the rejection can be increased to above 90% with higher reproducibility [21].…”

Section: Introductionmentioning

confidence: 91%

Increasing the success rate of interfacial polymerization on hollow fibers by the single-step addition of an intermediate layer

Mohammadifakhr

Trzaskuś²,

Kemperman

et al. 2020

Desalination

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In this paper, we introduce a single-step process that incorporates an intermediate layer on a hollow fiber to enhance the final membrane performance after interfacial polymerization (IP). This intermediate layer is applied during hollow-fiber spinning by complexation of two oppositely charged polyelectrolytes. Specifically, in this study, we consider the IP coating process an experimental success for a membrane sample with a NaCl rejection > 85%. The IP success rate is defined as the percentage of the samples with a NaCl rejection of > 85% within a studied group. The purpose of the intermediate layer is to increase the success rate of IP on the inner surface of the hollow fibers, typically a challenging task due to the cylindrical shape of the fibers. After the application of IP, the pure water permeance and NaCl rejection of the nascent membranes were tested to determine the success rate of IP. The IP success rate was 86-100% for the hollow fibers (HF) with intermediate layer, significantly higher than the 29% success rate achieved for IP on the support without intermediate layer. This surface modification approach is simple, time-efficient, and effective without any need for post-IP optimization that opens up new avenues for further developments for IP based dense hollow fiber membranes.

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Section: Introductionmentioning

confidence: 91%

Increasing the success rate of interfacial polymerization on hollow fibers by the single-step addition of an intermediate layer

Mohammadifakhr

Trzaskuś²,

Kemperman

et al. 2020

Desalination

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“…It is well established that FT-30-type RO membranes contain micro-and mesoporous defects in the dry state, clearly indicated by Knudsen selectivity for small gas molecules [32,33]. In the dry state, these defects have a significant impact on the gas separation capabilities of such membranes.…”

Section: A C C E P T E D Accepted Manuscriptmentioning

confidence: 99%

Defect-free highly selective polyamide thin-film composite membranes for desalination and boron removal

Ali

Sunbul

Pacheco

et al. 2019

Journal of Membrane Science

107

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Removal of boron from saline water sources has presented a major challenge for commercially available reverse osmosis desalination membranes. In this work, we report the boron and sodium chloride separation properties of truly defect-free, highly selective, interfacially polymerized aromatic polyamide thin-film composite membranes. The fabricated membranes show potential for separating sodium chloride with a maximum rejection of 99.6% obtained for the optimized film-forming protocol under lab-scale brackish water desalination conditions. This translated into promising boron rejection performance with rejections of up to 99% at pH 10, higher than a number of commercially available reverse osmosis membranes tested in-house. Comprehensive characterization including X-ray photoelectron spectroscopy, atomic force microscopy, scanning electron microscopy, ellipsometry, and surface charge measurements revealed intimate insights on interfacially polymerized polyamide membrane structure-property relationships. Increased membrane crosslinking was shown to be the primary determining factor for membrane permselectivity performance. Furthermore, relationships were established between microstructural properties such as crosslinking and morphological characteristics like surface roughness, highlighting an intricate and complex structure formation mechanism.

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“…Sijbesma et al 108 for example investigated the water permeation and stability under flow of the flue gas; they suggested that polymeric membranes are viable to directly separate CO 2 from the flue gas. Louie et al 109 studied the effect of Pebax coating on reverse osmosis (RO) membranes, the RO membranes had defects and by using a thin film of Pebax the gas permeation was greatly decreased but the selectivity was enhanced two-fold. They also suggested that by treating Pebax with different solvents, the morphology can be changed.…”

Section: Multi-block Copolymer Membranesmentioning

confidence: 99%

Some approaches for high performance polymer based membranes for gas separation: block copolymers, carbon molecular sieves and mixed matrix membranes

Yave²,

2012

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The intrinsic characteristics of a membrane process, i.e. efficiency and operational simplicity, high selectivity and permeability for the transport of specific components, compatibility between different membrane operations in integrated systems, low energetic requirements, easy control and scale-up, and high operational flexibility, might be decisive factors in imposing membrane processes in most gas separation fields. This review highlights the research hardware in membrane gas separation, i.e. the membrane material. Emphasis has been devoted to three interesting and important membrane classes for gas separation: block copolymer membranes, carbon membranes and mixed matrix membranes.

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Gas and liquid permeation properties of modified interfacial composite reverse osmosis membranes

Cited by 44 publications

References 24 publications

Increasing the success rate of interfacial polymerization on hollow fibers by the single-step addition of an intermediate layer

Increasing the success rate of interfacial polymerization on hollow fibers by the single-step addition of an intermediate layer

Defect-free highly selective polyamide thin-film composite membranes for desalination and boron removal

Some approaches for high performance polymer based membranes for gas separation: block copolymers, carbon molecular sieves and mixed matrix membranes

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