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Impact of Silver Nanoparticle Concentration and Size in Colloidal-Silver-Impregnated Ceramic Filters for Point-of-Use Removal of E. coli and MS-2 Phage

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Colloidal-silver-impregnated ceramic filters for household water treatment were manufactured and tested for performance with respect to the influence of silver nanoparticle (AgNP) concentration and average AgNP diameter on the disinfection of E. coli and MS-2 phage. Filters were manufactured by combining clay with water, flour, and a grog material (previously fired clay), molding the materials into cylinders, and firing at 900°C for 8 h. Colloidal silver was painted on the ceramic surface after firing. Bacterial transport experiments were conducted for AgNP concentrations of 0 mg/L, 0.1 mg/L, 1 mg/L, and 10 mg/L and for average AgNP diameters of 20 nm, 30 nm, and 80 nm at a concentration of 50 mg/L. Filters removed between 99.96% and 100% of influent bacteria. Viral transport experiments were conducted for AgNP concentrations of 0 mg/L, 20 mg/L, 100 mg/L, and 200 mg/L and for average AgNP diameters of 20 nm, 30 nm, and 80 nm at a concentration of 50 mg/L. Filters removed between 49.19% and 58.50% of influent viruses. While results from MS-2 tests suggest that filters are less effective at removing viral pathogens from water, E. coli experiments demonstrate the effectiveness of filters in reducing the concentration of bacteria in water and indicate that both AgNP concentration and size may be important factors to consider during filter fabrication.
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Keywords: Ceramic water filter; E. coli; MS-2 phage; disinfection; silver nanoparticle

Document Type: Research Article

Publication date: 2011-01-01

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