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Removal of Nickel and Cobalt from Aqueous Solutions by Na-Activated Bentonite

Published online by Cambridge University Press:  28 February 2024

Stella Triantafyllou ,
Eirini Christodoulou  and
Paraskevi Neou-Syngouna
Stella Triantafyllou
Affiliation:
National Technical University of Athens, Department of Mining and Metallurgical Engineering, Laboratory of Metallurgy, Heroon Polytechniou 9, 15780, Zografou, Greece
Eirini Christodoulou
Affiliation:
National Technical University of Athens, Department of Mining and Metallurgical Engineering, Laboratory of Metallurgy, Heroon Polytechniou 9, 15780, Zografou, Greece
Paraskevi Neou-Syngouna
Affiliation:
National Technical University of Athens, Department of Mining and Metallurgical Engineering, Laboratory of Metallurgy, Heroon Polytechniou 9, 15780, Zografou, Greece
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Abstract

The ability of Na-activated bentonite to remove Ni2+ and Co2+ from aqueous solutions at room temperature (22 ± 1°C) was studied under various experimental conditions. The parameters studied were solid-to-liquid ratios and initial cation concentrations. Experiments involved the behavior of bentonite vs. Ni and Co separately and where Ni and Co were present in solution at different concentrations and ratios. Bentonite retained substantial amounts of both metals readily, but it showed a higher affinity for Ni. Over-exchange appears when initial metal concentration exceeds the concentration corresponding to the cation exchange capacity (CEC) of bentonite. The presence of both metals in solution may be either synergistic or antagonistic sorption, depending on the initial ion concentrations.

Keywords

AdsorptionBentoniteCation ExchangeClaysCobalt RemovalHeavy MetalsNickel RemovalWastewater
Type
Research Article
Information
Clays and Clay Minerals , Volume 47 , Issue 5 , October 1999 , pp. 567 - 572
Copyright
Copyright © 1999, The Clay Minerals Society

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