Improving the performance of polyamide reverse osmosis membrane by incorporation of modified multi-walled carbon nanotubes

Polyamide reverse osmosis membranes incorporating carboxy-functionalized multi-walled carbon nanotubes (MWNTs) were prepared by interfacial polymerization of metaphenylene diamine and trimesoyl chloride. The pristine MWNTs were pre-treated with mixed acids before being modified with diisobutyryl per...

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Veröffentlicht in:Journal of membrane science 2014-01, Vol.450, p.249-256
Hauptverfasser: Zhao, Haiyang, Qiu, Shi, Wu, Liguang, Zhang, Lin, Chen, Huanlin, Gao, Congjie
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Sprache:eng
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Zusammenfassung:Polyamide reverse osmosis membranes incorporating carboxy-functionalized multi-walled carbon nanotubes (MWNTs) were prepared by interfacial polymerization of metaphenylene diamine and trimesoyl chloride. The pristine MWNTs were pre-treated with mixed acids before being modified with diisobutyryl peroxide to enhance their dispersity and chemical activity. The prepared nanocomposite membranes had a 100–300nm skin layer and the modified MWNTs were embedded within the skin layer, which was confirmed by scanning electron microscopy and transmission electron microscopy. The surface of the nanocomposite membrane was shown to be more negatively charged than bare polyamide membrane. It was shown that with an increase in the carbon nanotube loading in the membrane, the membrane morphology changed distinctly, leading to a significantly improved flux without sacrificing the solute rejection. Meanwhile, the nanocomposite membranes showed better antifouling and antioxidative properties than MWNT-free polyamide membranes, suggesting that the incorporation of modified MWNTs in membranes is effective for improving the membrane performance. Modified multi-walled carbon nanotubes have been incorporated into polyamide reverse osmosis membrane to improve the separation performance. [Display omitted] •Appropriate modification improves the compatibility between MWNTs and polyamide.•Flux of polyamide/MWNT membrane increased without largely sacrificing the rejection.•Antifouling properties of membranes were enhanced by incorporating MWNTs.•Antioxidative properties of membranes were also improved by incorporating MWNTs.
ISSN:0376-7388
1873-3123
DOI:10.1016/j.memsci.2013.09.014