Water disinfection with geopolymer–bentonite composite foam containing silver nanoparticles

[Display omitted] •Water disinfection with geopolymer composite foam is reported for the first time.•Geopolymer and Ag0-bentonite formed the matrix and dispersed phases, respectively.•Disinfection efficiency against E. coli and enterococci was promising for ∼1 d.•Leaching of Na, Al, Si, Ag, and pH r...

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Bibliographic Details
Published in:Materials letters 2022-03, Vol.311, p.131636, Article 131636
Main Authors: Luukkonen, Tero, Bhuyan, Mohammad, Hokajärvi, Anna-Maria, Pitkänen, Tarja, Miettinen, Ilkka T.
Format: Article
Language:English
Subjects:
Aluminum
Bentonite
Coliforms
Deactivation
Disinfection
Disintegration
Drinking water
E coli
Geopolymer
Geopolymers
Materials science
Nanoparticles
Silicon
Silver
Silver nanoparticles
Water purification
Water quality
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Summary:[Display omitted] •Water disinfection with geopolymer composite foam is reported for the first time.•Geopolymer and Ag0-bentonite formed the matrix and dispersed phases, respectively.•Disinfection efficiency against E. coli and enterococci was promising for ∼1 d.•Leaching of Na, Al, Si, Ag, and pH remained within drinking water guideline values. Geopolymers resemble conventional ceramics but can be manufactured at near-ambient temperatures. In this work, geopolymer–bentonite composite foam with silver nanoparticles was prepared and applied for water disinfection, inspired by point-of-use ceramic water filters. The inactivation efficiency against Escherichia coli and intestinal enterococci bacteria was found to be promising (0.6–2.4 and 0.3–1.4 log10 reductions, respectively) for ∼1 d. However, the inactivation efficiency against somatic coliphage viruses was poor (
ISSN:0167-577X
1873-4979
DOI:10.1016/j.matlet.2021.131636