Silver-embedded granular activated carbon as an antibacterial medium for water purification
✍ Scribed by Rajdip Bandyopadhyaya; M. Venkata Sivaiah; P. A. Shankar
- Publisher
- Wiley (John Wiley & Sons)
- Year
- 2008
- Tongue
- English
- Weight
- 123 KB
- Volume
- 83
- Category
- Article
- ISSN
- 0268-2575
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✦ Synopsis
Abstract
Silver (Ag) particle embedded granular activated carbon (GAC) was made for the first time to assess its ability in inhibiting the growth of Escherichia coli (E. coli), a water‐borne bacterial pathogen. Ag‐GAC was made by impregnating GAC with AgNO~3~ and then reducing it to metallic Ag. Plate assay showed slight inhibition of E. coli, even with Ag‐GAC prepared from 0.005 mol L^−1^ AgNO~3~, but this and shake flask tests showed a conspicuous effect only for higher concentrations of 0.1–1 mol L^−1^ AgNO~3~. Flow tests further indicated that Ag‐GAC made from 1.0 mol L^−1^ AgNO~3~ caused a desirable three orders of reduction in E. coli number concentration in less than 30 s. An optimum of 9–10.5 wt% of embedded Ag in the final Ag‐GAC product was necessary for the requisite complete inhibition of E. coli, killing bacteria in the contact‐mode for up to 350 L of flowing water. These results prove that Ag‐GAC possesses antibacterial properties and can be used for disinfection to produce potable quality water. Copyright © 2008 Society of Chemical Industry