Sorption of small amounts of europium(III) on iron(III) hydroxide and oxide

Musić, Svetozar; Gessner, M.; Wolf, R. H. H.

doi:10.1007/bf02519945

Cited by 26 publications

(6 citation statements)

References 18 publications

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“…The enhanced adsorption of zirconium ions beyond 6.0 pH could probably be due to the condensation reaction between the hydrolysis products of the sorbate ions and the sorbent carrying −OH groups [34]. It can, therefore, be concluded that the over all adsorption of zirconium ions on the surface of LM used is mainly due to the combined effect of hydrous oxides of iron and silica present in the LM.…”

Section: Variation Of Phmentioning

confidence: 98%

Zirconium decontamination from aqueous media using lateritic minerals

Khalid¹,

Daud²,

Ahmad³

2005

Radiochimica Acta

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The sorption behavior of zirconium on minerals from a lateritic weathering has been carried out to evaluate its potential for the decontamination of zirconium ions from aqueous solutions. Various physico-chemical parameters such as selection of appropriate electrolyte, equilibration time, amount of adsorbent, concentration of adsorbate, effect of diverse ions and temperature were studied in order to simulate the best conditions under which this material can be used as an adsorbent, employing batch method and radiotracer technique. Maximum adsorption was observed at 0.005 mol L −1 acid solutions (HNO 3 , HCl, H 2 SO 4 and HClO 4 ) using 0.3 g of adsorbent for 1.499 × 10 −4 mol L −1 zirconium concentration in five minutes equilibration time. Studies show that the adsorption of zirconium decreases with the increase in the concentrations of all the acids. The adsorption data follows the Freundlich isotherm over the range of 7.5 × 10 −5 to 3.0 × 10 −3 mol L −1 zirconium concentration. The characteristic Freundlich constants i.e. 1/n = 0.55 ± 0.03 and K = 1.36 × 10 −3 ± 7.0 × 10 −5 mol g −1 have been computed for the sorption system. The sorption mean free energy from the Dubinin-Radushkevich isotherm is 11.2 ± 0.4 kJ mol −1 indicating ion-exchange mechanism of chemisorption. The uptake of zirconium increases with the rise in temperature (283-323 K). Thermodynamic quantities i.e. ∆G, ∆S and ∆H have also been calculated for the system. The sorption process was found endothermic.

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Section: Variation Of Phmentioning

confidence: 98%

Zirconium decontamination from aqueous media using lateritic minerals

Khalid¹,

Daud²,

Ahmad³

2005

Radiochimica Acta

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“…Literature data show considerable differences both in the K d values itself and in its pH dependence. As no information is given in most cases about the number of surface sites or the acid-base characteristics of the given hematite (29,31), it is difficult to compare the data on the basis of a surface complexation model. Such data are available only from Marmier et al (30 Fig.…”

Section: Comparison With Literature Datamentioning

confidence: 99%

Sorption of Eu(III) on a Natural Hematite: Application of a Surface Complexation Model

Rabung

Geckeis

Kim

et al. 1998

Journal of Colloid and Interface Science

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“…The pH dependence study of cadmium adsorption (8.89 £ 10 25 mol L 21 ) on LM was, therefore, carried out using 10 mL of buffer solutions of different pH covering a range of 1 to 10, using 0.2 g of adsorbent. [32] . 2.…”

Section: Variation Of Phmentioning

confidence: 99%

Cadmium Decontamination from Aqueous Media Using Lateritic Minerals

Ahmad

Khalid

Daud

2003

Separation Science and Technology

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In this study, lateritic minerals were exploited to evaluate their potential for the decontamination of cadmium ions from aqueous solutions as well as for understanding the nature of the decontamination mechanism. Various physicochemical parameters, such as selection of appropriate electrolyte, equilibration time, amount of adsorbent, concentration of adsorbate, effect of diverse ions, and temperature, were studied to simulate the best conditions in which this material can be used as an adsorbent. Maximum adsorption was observed at 0.005 mol L 21 acid solutions (HNO 3 , HCl, and HClO 4 ) using 0.2 g of adsorbent for 8.89 £ 10 25 mol L 21 cadmium concentration in 10 minutes equilibration time. Studies show that the adsorption of cadmium decreases with the increase in the concentrations of all the acids. The adsorption data follows the Freundlich isotherm over the range of 1.78 £ 10 25 to 1.78 £ 10 23 mol L 21 cadmium concentration.The characteristic Freundlich constants, i.e., 1/n ¼ 0.61^0.02 and K ¼ 5.14 £ 10 24^1 .14 £ 10 25 mol g 21 have been computed for the sorption system. The sorption mean free energy from the Dubinin -Radushkevich isotherm is 10.1^0.6 kJ mol 21 , indicating an ionexchange mechanism of chemisorption. The uptake of cadmium increases with the rise in temperature (278 to 323 K). Thermodynamic quantities, i.e., DG, DS, and DH were also been calculated for the system. The sorption process was found to be exothermic.

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Sorption of small amounts of europium(III) on iron(III) hydroxide and oxide

Cited by 26 publications

References 18 publications

Zirconium decontamination from aqueous media using lateritic minerals

Zirconium decontamination from aqueous media using lateritic minerals

Sorption of Eu(III) on a Natural Hematite: Application of a Surface Complexation Model

Cadmium Decontamination from Aqueous Media Using Lateritic Minerals

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