Potential of silver nanoparticle-coated polyurethane foam as an antibacterial water filter
Article first published online: 18 FEB 2005
Copyright © 2005 Wiley Periodicals, Inc.
Biotechnology and Bioengineering
Volume 90, Issue 1, pages 59–63, 5 April 2005
How to Cite
Jain, P. and Pradeep, T. (2005), Potential of silver nanoparticle-coated polyurethane foam as an antibacterial water filter. Biotechnol. Bioeng., 90: 59–63. doi: 10.1002/bit.20368
- Issue published online: 14 MAR 2005
- Article first published online: 18 FEB 2005
- Manuscript Accepted: 1 OCT 2004
- Manuscript Received: 25 JUN 2004
- silver nanoparticles;
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.