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Silver-modified clinoptilolite for the removal of Escherichia coli and heavy metals from aqueous solutions

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Abstract

This paper investigates the potential of using the silver antibacterial properties combined with the metal ion exchange characteristics of silver-modified clinoptilolite to produce a treatment system capable of removing both contaminants from aqueous streams. The results have shown that silver-modified clinoptilolite is capable of completely eliminating Escherichia coli after 30-min contact time demonstrating its effectiveness as a disinfectant. Systems containing both E. coli and metals exhibited 100 % E. coli reduction after 15-min contact time and maximum metal adsorption removal efficiencies of 97, 98, and 99 % for Pb2+, Cd2+, and Zn2+ respectively after 60 min; 0.182–0.266 mg/g of metal ions were adsorbed by the zeolites in the single- and mixed-metal-containing solutions. Nonmodified clinoptilolite showed no antibacterial properties. This study demonstrated that silver-modified clinoptilolite exhibited high disinfection and heavy metal removal efficiencies and consequently could provide an effective combined treatment system for the removal of E. coli and metals from contaminated water streams.

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Authors and Affiliations

  1. Department of Civil and Environmental Engineering, University of Surrey, Guildford, Surrey, UK

    Lulu Akhigbe, Sabeha Ouki, Devendra Saroj & Xiang Min Lim

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  1. Lulu Akhigbe
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  2. Sabeha Ouki
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  3. Devendra Saroj
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  4. Xiang Min Lim
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Correspondence to Lulu Akhigbe.

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Responsible editor: Gerald Thouand

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Akhigbe, L., Ouki, S., Saroj, D. et al. Silver-modified clinoptilolite for the removal of Escherichia coli and heavy metals from aqueous solutions. Environ Sci Pollut Res 21, 10940–10948 (2014). https://doi.org/10.1007/s11356-014-2888-6

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  • DOI: https://doi.org/10.1007/s11356-014-2888-6

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