TY - JOUR
T1 - Equilibrium ion exchange studies of Zn2+, Cr3+, and Mn2+ on natural bentonite
AU - Stylianou, Marinos A.
AU - Inglezakis, Vassilis J.
AU - Loizidou, Maria D.
AU - Agapiou, Agapios
AU - Itskos, Grigorios
PY - 2016/9/29
Y1 - 2016/9/29
N2 - 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.
AB - 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.
KW - Adsorption
KW - Bentonite
KW - Chromium
KW - Heavy metals
KW - Ion exchange
KW - Manganese
KW - Zinc
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U2 - 10.1080/19443994.2016.1235153
DO - 10.1080/19443994.2016.1235153
M3 - Article
AN - SCOPUS:84989261748
SP - 1
EP - 11
JO - Desalination and Water Treatment
JF - Desalination and Water Treatment
SN - 1944-3994
ER -