Imparting antimicrobial and anti-adhesive properties to polysulfone membranes through modification with silver nanoparticles and polyelectrolyte multilayers

Tang, L., Huynh, K. A., Fleming, M. L., Larronde-Larretche, M. and Chen, K. L. (2015) Imparting antimicrobial and anti-adhesive properties to polysulfone membranes through modification with silver nanoparticles and polyelectrolyte multilayers. Journal of Colloid and Interface Science, 451, pp. 125-133. (doi:10.1016/j.jcis.2015.03.051)

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Abstract

The antimicrobial and bacterial anti-adhesive properties of polysulfone (PSU) membranes modified with silver nanoparticles (AgNPs) and polyelectrolyte multilayers (PEMs) composed of poly(allylamine hydrochloride) and poly(acrylic acid) were investigated. The membranes’ antimicrobial properties were evaluated using a colony forming unit (CFU) enumeration method, while the anti-adhesive properties of the membranes were examined using a direct microscopy observation membrane filtration system. The AgNP mass loading required for the inhibition of bacterial growth on the AgNP/PEM-modified membranes was significantly lower than the AgNP loadings reported in other studies for membranes with the nanoparticles dispersed within the membrane matrix. The immobilization of AgNPs on the membrane surface maximized the opportunities for bacteria-nanoparticle contact, which allowed for effective bacteria inactivation. Furthermore, in comparison to unmodified PSU membranes, the bacterial deposition kinetics on all the modified membranes were reduced by ca. 50% and the bacterial removal efficiencies were significantly increased from close to 0% to as high as over 90%. Three-cycle filtration and rinsing experiments were also performed to evaluate the effectiveness of the surface modification over an extended time period of use.

Item Type:Articles
Additional Information:This work was funded by the U.S. National Science Foundation (CBET-1133559) and the Johns Hopkins Water Institute. L.T. acknowledges funding support from the Dean Robert H. Roy and Gordon Croft fellowships. M.L-L. is supported by the U.S. NSF and the University of Glasgow.
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Larronde-larretche, Mathieu
Authors: Tang, L., Huynh, K. A., Fleming, M. L., Larronde-Larretche, M., and Chen, K. L.
College/School:College of Science and Engineering > School of Engineering > Infrastructure and Environment
Journal Name:Journal of Colloid and Interface Science
Publisher:Elsevier
ISSN:0021-9797
ISSN (Online):1095-7103
Published Online:02 April 2015

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