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Effect of mobile cation on zeolite-polyamide thin film nanocomposite membranes

Published online by Cambridge University Press:  31 January 2011

Mary Laura Lind ,
Byeong-Heon Jeong ,
Arun Subramani ,
Xiaofei Huang  and
Eric M.V. Hoek
Byeong-Heon Jeong
Affiliation:
UCLA Civil & Environmental Engineering Department, and California NanoSystems Institute, University of California—Los Angeles, Los Angeles, California 90095
Arun Subramani
Affiliation:
UCLA Civil & Environmental Engineering Department, and California NanoSystems Institute, University of California—Los Angeles, Los Angeles, California 90095
Eric M.V. Hoek*
Affiliation:
UCLA Civil & Environmental Engineering Department, and California NanoSystems Institute, University of California—Los Angeles, Los Angeles, California 90095
*
c) Address all correspondence to this author. e-mail: [email protected]
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Abstract

Hybrid zeolite-polyamide thin film nanocomposite (TFN) reverse osmosis membranes were synthesized by incorporating Linde type A (LTA)-type zeolite molecular sieve nanocrystals in the interfacial polymerization reaction used to form polyamide thin films. Nanocrystals were prepared with two different mobile cations (Na+ and Ag+) exchanged within the LTA crystal matrix. Incorporation of molecular sieve nanocrystals into polyamide thin films during interfacial polymerization was verified by infrared spectroscopy. Both TFN membranes exhibited higher water permeability, while maintaining similar salt rejection to pure polyamide thin film composite membranes. Nanocomposite thin films containing LTA nanocrystals in the silver form (AgA) produced a greater increase in water permeability than those in the sodium form (NaA). Furthermore, AgA-TFN membranes exhibited more hydrophilic and smooth interfaces, which appeared to inhibit adhesion of bacteria cells onto the membranes. The AgA nanocrystals exhibited significant bactericidal activity; however, when encapsulated within polyamide thin films the antimicrobial activity was significantly reduced.

Keywords

AdhesionNanostructurePolymerization
Type
Outstanding Symposium Papers
Information
Journal of Materials Research , Volume 24 , Issue 5 , May 2009 , pp. 1624 - 1631
Copyright
Copyright © Materials Research Society 2009

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