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Antibacterial activity of metal-containing clinoptilolite in natural seawater.
- Source :
- Desalination & Water Treatment; Dec2019, Vol. 170, p75-79, 5p
- Publication Year :
- 2019
-
Abstract
- Antibacterial activity of a natural zeolite, clinoptilolite (Z), enriched with about 0.4-0.5 mmol of Ag (Ag-Z), Cu (Cu-Z) or Zn (Zn-Z) was tested toward two strains of Gram-negative bacteria - Escherichia coli and Acinetobacter baumannii - in natural seawater from Adriatic Sea (Croatia). The Ag-Z and Cu-Z exhibited bactericidal activity toward E. coli and A. baumannii after 3 and 6 h of exposure, respectively. The Zn-Z showed antibacterial activity toward both strains, but lacking the bactericidal effect even after 24 h of exposure. All studied samples released metal cations in seawater. Concentration of Ag and Zn leached from Ag-Z and Zn-Z was higher than maximum allowable concentrations (MAC) for drinking water, whereas concentration of Cu was below MAC. Due to high concentration of Na+ in seawater (about 1.2 g Na+ dm-3) an ion-exchange process can be responsible for the leaching of the studied cations. The lowest extent of leaching from Cu-Z was ascribed to different position and geometry of sites occupied by Cu(II) in the clinoptilolite lattice. The antibacterial activity of M-Z was attributed to the metal cations leached from the zeolite lattice into seawater. The obtained results indicate that Cu-Z can be considered as a promising disinfectant for treatment of seawater. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 19443994
- Volume :
- 170
- Database :
- Complementary Index
- Journal :
- Desalination & Water Treatment
- Publication Type :
- Academic Journal
- Accession number :
- 141203371
- Full Text :
- https://doi.org/10.5004/dwt.2019.24712