Effects of Chloride Concentration on the Water Disinfection Performance of Silver Containing Nanocellulose-based Composites

The availability of microbially-safe drinking water is a challenge in many developing regions. Due to the well-known antibacterial effect of silver ions, materials used for their controlled release have been widely studied for point-of-use water disinfection. However, even if it is in principle know...

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Bibliographic Details
Published in:Scientific reports 2019-12, Vol.9 (1), p.19505-10, Article 19505
Main Authors: Lehtonen, Janika, Hassinen, Jukka, Honkanen, Riina, Kumar, Avula Anil, Viskari, Heli, Kettunen, Anu, Pahimanolis, Nikolaos, Pradeep, Thalappil, Rojas, Orlando J., Ikkala, Olli
Format: Article
Language:English
Subjects:
631/326/22
639/301/357
639/301/357/404
639/301/357/551
639/638
639/638/224/685
639/638/298
639/638/455/957
Aluminum
Anions
Chloride
Chlorides
Controlled release
Disinfection
Drinking water
E coli
Escherichia coli
Humanities and Social Sciences
Ions
multidisciplinary
Nanocomposites
Nanoparticles
Purification
Science
Science (multidisciplinary)
Silver
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Summary:The availability of microbially-safe drinking water is a challenge in many developing regions. Due to the well-known antibacterial effect of silver ions, materials used for their controlled release have been widely studied for point-of-use water disinfection. However, even if it is in principle known that chloride anions can suppress the antibacterial efficiency of silver, the majority of previous studies, surprisingly, have not focused on chloride concentrations relevant for freshwaters and thus for practical applications. Here, we prepared low-cost nanocellulose-aluminium oxyhydroxide nanocomposites functionalized with silver nanoparticles. Field samples obtained from Chennai, India were used as a guideline for choosing relevant chloride concentrations for the antibacterial studies, i.e., 10, 90, and 290 ppm. The antibacterial performance of the material against Escherichia coli and Bacillus subtilis was demonstrated and the influence of chloride concentration on the antibacterial effect was studied with E. coli . A 1 h contact time led to bacterial reductions of 5.6 log 10 , 2.9 log 10 , and 2.2 log 10 , respectively. This indicates that an increase of chloride concentration leads to a substantial reduction of antibacterial efficiency, even within chloride concentrations found in freshwaters. This work enables further insights for designing freshwater purification systems that utilize silver-releasing materials.
ISSN:2045-2322
2045-2322
DOI:10.1038/s41598-019-56009-6