A Characterization of Bacterial Disinfection Kinetics Using Silver Nanoparticles

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The objective of this study was to investigate the effect of silver nanoparticle (AgNP) concentration and size on the inactivation kinetics of bacteria. Batch disinfection experiments were performed for E. coli using three distinct AgNP concentrations (0.1 mg/L, 1 mg/L and 10 mg/L) and three distinct AgNP sizes (20 nm, 30 nm and 80 nm). Results suggest that concentration affects inactivation time, with higher concentrations decreasing the amount of time required to kill a given number of bacteria. Additionally, results indicate that AgNP size may impact effectiveness, with smaller particles also decreasing inactivation time relative to larger particles. Resulting data will be interpreted using the Rennecker-Marinas concentration-time product model for accelerating disinfection in order to identify the coefficients of specific lethality (Λ). Calculated values of Λ and Ct products will be useful for comparison to alternate disinfectants, as well as for determining appropriate doses in technologies using AgNPs for water disinfection.

Keywords: E. coli; Water disinfection; disinfection kinetics; silver nanoparticle (AgNP)

Document Type: Research Article

DOI: http://dx.doi.org/10.2175/193864711802863779

Publication date: January 1, 2011

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