Sorption of metal cations on suspended bentonite: effects of pH, ionic strength and complexing anions
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Parveen Kumar Verma
und
Prasanta Kumar Mohapatra
Abstract
Batch sorption experiments have been carried out to understand the interaction of different metal cations such as Am(III), Eu(III), Sr(II), and Cs(I) with bentonite clay at varying pH (1–9). The effects of other experimental parameters such as ionic strength (0.01–1 M (NaClO4)), clay to metal ion concentration ratio, and the presence of complexing anions such as oxalic acid (ox), carbonate (CO32−), ethylenediaminetetraacetic acid (EDTA), and humic acid (HA) on Eu(III) sorption have also been investigated. The sorption of Eu(III) has been found to be invariant with the change in ionic strength suggesting inner-sphere complexation on the bentonite surface. Near quantitative sorption of Eu(III) and Am(III) has been observed in the entire pH range and there is marginal influence of the presence of 1 · 10–4 M of ox and CO32− on the sorption profile. However, the presence of 1 · 10–4 M EDTA suppresses the sorption of Eu(III) ion onto bentonite. Desorption studies of Eu(III) loaded onto bentonite using varying concentrations of HClO4 (0.01–1.0 M) solutions reveal that higher acidity favors the process. The sorption of Eu(III) on bentonite followed the Langmuir isotherm suggesting monolayer sorption process. The data fitting to D-R isotherm suggested that the Eu(III) sorption on bentonite follows ion exchange mechanism. The sorption capacity of bentonite clay was determined to be 3.8(± 0.1) × 10−4 moles/g using Langmuir and D-R isotherms.
©2014 Walter de Gruyter Berlin/Boston
Artikel in diesem Heft
- Frontmatter
- Characterization of neutrons from a thick target 9Be(p, n) reaction by multiple foil activation technique for practical applications: measurement of integral cross sections and their comparison with integrated data from data files
- Americium dioxocations in solid: crystal structures and absorption spectra of the new complexes [AmVO2(dipy)OOCCH3(H2O)] and Cs2[(AmVIO2)2(SO4)3]
- Influence of the redox state on the neptunium sorption under alkaline conditions: Batch sorption studies on titanium dioxide and calcium silicate hydrates
- Sorption of metal cations on suspended bentonite: effects of pH, ionic strength and complexing anions
- Speciation of bioaccumulated uranium(VI) by Euglena mutabilis cells obtained by laser fluorescence spectroscopy
- Adsorption of arsenic from aqueous media using lateritic minerals: Equilibrium, kinetic and thermodynamic studies
- Separation of 90Nb from zirconium target for application in immuno-PET
- Erbium-169 labeled hydroxyapatite particulates for use in radiation synovectomy of digital joints – a preliminary investigation
- Radiolytic stability of di-2-ethylhexyl-dioctyl diglycolamide
- Thermal behaviour of hafnium diethylenetriaminepentaacetate studied using the Perturbed Angular Correlation Technique
Artikel in diesem Heft
- Frontmatter
- Characterization of neutrons from a thick target 9Be(p, n) reaction by multiple foil activation technique for practical applications: measurement of integral cross sections and their comparison with integrated data from data files
- Americium dioxocations in solid: crystal structures and absorption spectra of the new complexes [AmVO2(dipy)OOCCH3(H2O)] and Cs2[(AmVIO2)2(SO4)3]
- Influence of the redox state on the neptunium sorption under alkaline conditions: Batch sorption studies on titanium dioxide and calcium silicate hydrates
- Sorption of metal cations on suspended bentonite: effects of pH, ionic strength and complexing anions
- Speciation of bioaccumulated uranium(VI) by Euglena mutabilis cells obtained by laser fluorescence spectroscopy
- Adsorption of arsenic from aqueous media using lateritic minerals: Equilibrium, kinetic and thermodynamic studies
- Separation of 90Nb from zirconium target for application in immuno-PET
- Erbium-169 labeled hydroxyapatite particulates for use in radiation synovectomy of digital joints – a preliminary investigation
- Radiolytic stability of di-2-ethylhexyl-dioctyl diglycolamide
- Thermal behaviour of hafnium diethylenetriaminepentaacetate studied using the Perturbed Angular Correlation Technique
