Equilibrium ion exchange studies of Zn2+, Cr3+, and Mn2+ on natural bentonite

Marinos A. Stylianou, Vassilis J. Inglezakis, Maria D. Loizidou, Agapios Agapiou, Grigorios Itskos

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9 Citations (Scopus)


Bentonite is a clay mineral often used in ion exchange processes due to its high ion exchange capacity. In the present study, a commercially available in Greece market bentonite was obtained and characterized by XRD, XRF, FTIR, BET, and TG/DTA analysis. Monmorillonite was the main component of bentonite sample (>80%). Ion exchange equilibria of Zn2+, Cr3+, and Mn2+ on bentonite was examined by use of batch equilibrium isotherms, distribution coefficients, and maximum exchange levels (MELs) under the same normality for all metals (0.01 N) at 25 ± 2°C. The equilibrium isotherms for the metals studied exhibit a favorable-type isotherm. Selectivity series deduced from equilibrium isotherms are Cr3+ > Zn2+ > Mn2+, and the same occurs for MELs. The Langmuir and Freundlich models were applied and fitted the equilibrium data for the metal ion uptake. A detailed literature review on heavy metals-bentonite equilibrium is provided.

Original languageEnglish
Pages (from-to)27853-27863
Number of pages11
JournalDesalination and Water Treatment
Issue number57
Early online date30 Sept 2016
Publication statusPublished - 7 Dec 2016


  • adsorption
  • bentonite
  • chromium
  • heavy metals
  • ion exchange
  • manganese
  • zinc


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