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High-performance asymmetric isoporous nanocomposite membranes with chemically-tailored amphiphilic nanochannels

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Abstract

Tailoring the well-defined nanochannels of ultrafiltration membranes from self-assembled block copolymers (BCPs) toward the nanofiltration regime can expand their potential applications in the fractionation or separation of small molecules. One big issue is to fabricate a nanofiltration membrane with high permeance, good selectivity and excellent fouling resistance. Here such a membrane is presented using a tailor-made diblock copolymer composed of a hydrophobic major block and an amphiphilic minor block. A scalable integral asymmetric isoporous membrane is fabricated by the solvent evaporation induced co-assembly of BCP and in situ formed inorganic titanium dioxide nanoparticles combined with nonsolvent induced phase separation. The membrane nanopores are readily post-functionalized using negatively charged moieties by straightforward in situ gas–solid reactions. The potential to use the post-functionalized membrane for separation of small organic molecules having 1–2 nm lateral dimensions (having molecular weights in the range of 300–1500 g mol−1) is demonstrated. The negatively charged membrane displays high flux, excellent antifouling properties with a low permeation flux decline and nearly complete flux recovery. This type of membrane is a promising candidate for a new generation of nanofiltration membranes.

Graphical abstract: High-performance asymmetric isoporous nanocomposite membranes with chemically-tailored amphiphilic nanochannels

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Supplementary files

Article information


Submitted
25 Jan 2020
Accepted
16 Mar 2020
First published
16 Mar 2020

This article is Open Access

J. Mater. Chem. A, 2020, Advance Article
Article type
Paper

High-performance asymmetric isoporous nanocomposite membranes with chemically-tailored amphiphilic nanochannels

Z. Zhang, Md. M. Rahman, C. Abetz and V. Abetz, J. Mater. Chem. A, 2020, Advance Article , DOI: 10.1039/D0TA01023E

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