Adsorption of cobalt from aqueous solutions onto sepiolite

M. Kara, H. Yuzer, E. Sabah, M. S. Celik*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

473 Citations (Scopus)

Abstract

Adsorption of Co(II) ions from aqueous sepiolite suspensions has been systematically investigated as a function of several variables including activation conditions, solid to liquid ratio, pH and temperature. The results are analyzed to identify the mechanism of cobalt uptake by sepiolite. Both abstraction and real adsorption isotherms were constructed to isolate the precipitation of cobalt from the real adsorption. Also, for the first time a plausible correlation between the released Mg (II) ions from sepiolite matrix and those adsorbed Co (II) ions is made. A one to one ion exchange mechanism is found to describe the results. The data obtained from adsorption isotherms at different temperatures were fitted to various adsorption models to calculate thermodynamic quantities such as the free energy of adsorption, heat of adsorption and entropy of adsorption. The thermodynamic data indicate that Co (II) adsorption onto sepiolite is entropically driven and characterized by physical adsorption.

Original languageEnglish
Pages (from-to)224-232
Number of pages9
JournalWater Research
Volume37
Issue number1
DOIs
Publication statusPublished - Jan 2003

Funding

The financial support of Turkish State Planning Commission (DPT-107) is greatly acknowledged.

FundersFunder number
Turkish State Planning CommissionDPT-107

    Keywords

    • Adsorption
    • Clay minerals
    • Cobalt
    • Sepiolite
    • Wastewater treatment

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