Potential of silver nanoparticle-coated polyurethane foam as an antibacterial water filter

Authors

  • Prashant Jain,

    1. Department of Chemical Engineering, Indian Institute of Technology Madras, Chennai 600036, India
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  • T. Pradeep

    Corresponding author
    1. Department of Chemistry and Sophisticated Analytical Instrumentation Facility, Indian Institute of Technology Madras, Chennai 600036, India; telephone: ++91-44-2257 0509/8267; Fax: ++91-44-2257 0509/0545
    • Department of Chemistry and Sophisticated Analytical Instrumentation Facility, Indian Institute of Technology Madras, Chennai 600036, India; telephone: ++91-44-2257 0509/8267; Fax: ++91-44-2257 0509/0545
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Abstract

Silver nanoparticles can be coated on common polyurethane (PU) foams by overnight exposure of the foams to nanoparticle solutions. Repeated washing and air-drying yields uniformly coated PU foam, which can be used as a drinking water filter where bacterial contamination of the surface water is a health risk. Nanoparticles are stable on the foam and are not washed away by water. Morphology of the foam was retained after coating. The nanoparticle binding is due to its interaction with the nitrogen atom of the PU. Online tests were conducted with a prototypical water filter. At a flow rate of 0.5 L/min, in which contact time was of the order of a second, the output count of Escherichia coli was nil when the input water had a bacterial load of 105 colony-forming units (CFU) per mL. Combined with the low cost and effectiveness in its applications, the technology may have large implications to developing countries. © 2005 Wiley Periodicals, Inc.

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