Europium retention onto clay minerals from 25 to 150°C: Experimental measurements, spectroscopic features and sorption modelling

Tertre, Emmanuel; Berger, G.; Simoni, E.; Castet, Sylvie; Giffaut, Éric; Loubet, M.; Catalette, H.

doi:10.1016/j.gca.2006.06.1568

Cited by 177 publications

(87 citation statements)

References 51 publications

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“…The structure of these Ln-bentonites is studied by XRD, XRF, SEM-EDX, complexometric titration, ICP-OES and Mössbauer-spectroscopy. The results can prove the suggestion by Coppin et al [16], Wu et al [19], and Tertre et al [17] on the intercalation of Ln ions in the interlayer of smectite. In addition, information will be shown on the structural parameters of trivalent lanthanide cation exchanged bentonites.…”

Section: Introductionsupporting

confidence: 89%

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Preparation and structure’s analyses of lanthanide (Ln) -exchanged bentonites

Kovács

Baradács

Kónya

et al. 2017

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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Please cite this article as: Eszter Mária Kovács, Eszter Erdélyiné Baradács, Péter Kónya, Péter Kovács-Pálffy, Sándor Harangi, József Kónya, Noémi M.Nagy, Preparation and structure's analyses of lanthanide (Ln) -exchanged bentonites, Colloids and Surfaces A: Physicochemical and Engineering Aspects http://dx.doi.org/10. 1016/j.colsurfa.2017.02.085 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. HIGHLIGHTS REE-exchanged bentonites were prepared from Ca-bentonite by ion exchange.  The La 3+ -, Ce 3+ -, and Gd 3+ -bentonite, the sorbed ion amount was higher than the CEC.  In case of lanthanum-bentonite, the rare earth quantity is as high as 136% of CEC.  The iron(III) content of lanthanum bentonite is less than that of the original Cabentonite. 4Abstract The interaction between Lanthanides (Ln)-ions and Ca-bentonite and the structural changes accompanying were studied. Ln-exchanged bentonites were prepared from Cabentonite (Istenmezeje, Hungary) by ion exchange in three consecutive washings with lanthanide solutions. Scanning Eletronmicroscopy Energy Dispersive X-ray spectroscopy (SEM-EDX) studies showed even distribution of Lns and other components of bentonite. The natural bentonite and the lanthnide exchanged bentonites were characterized by X-ray diffraction (XRD), which revealed the same mineral composition, and the increase of the basal spacing of montmorillonite from 1.465 (Ca 2+ ) to 1.577 nm (REE 3+ ). The d001 basal spacing of lanthanide montmorillonite increases as the ion radius of the lanthanide cation increases. The Fe 3+ , and Lns 3+ amount on the bentonite were determined by X-rayfluorescence spectrometry (XRF) elemental analysis. The amount of exchanged Lns were determined by washing the Ln-bentonite with 1M ammonium-acetate, and measuring the amount of Ln released, using inductively coupled plasma optical emission spectrometry (ICP-OES). In most Ln-bentonites, the quantity of the exchanged Ln ions was about 80-90% of the cation exchange capacity (CEC) of the bentonite. In case of some lanthanides bentonite (La 3+ , Ce 3+ , and Gd 3+ ), however, the sorbed quantity of lanthanum ions was higher than the cation exchange capacity. In case of lanthanum-bentonite, the lanthanide quantity is as high as 136% of CEC. Moreover, the iron(III) content of lanthanum bentonite is less than that of the original Ca-bentonite. Mössbauer spectra of the La-, Ce-, and Gd-exchanged samples at 78 K revealed an unexpected magnetically split component that was absent from the Ca-bentonite. This component may belong to interlayer Fe. This iron can be released from the octahedral positions crystal lattice.5

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Section: Introductionsupporting

confidence: 89%

“…The conclusion was that the heavy Lns are being more sorbed than the light Lns at high ionic strength, because of the formation of inner-sphere complexes. Tertre et al [17] studied the sorption of Eu(III) onto kaolinite and montmorillonite. At the studied temperature, adsorption is the sole process of Eu(III) retention.…”

Section: Introductionmentioning

confidence: 99%

Preparation and structure’s analyses of lanthanide (Ln) -exchanged bentonites

Kovács

Baradács

Kónya

et al. 2017

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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“…The surface charge of kaolinite is predominately controlled by charge determining reactions of surface groups, in particular acid/base reactions of the aluminol and silanol groups. At seawater pH, both types of surfaces are expected to carry a net negative charge (Tertre et al, 2006 . The surface charge of montmorillonite depends only to a minor extent on protonation and deprotonation of surface sites due to the negative layer charge and adsorption of negatively charged ions onto the montmorillonite surface is typically electrostatically unfavorable.…”

Section: Sorption Of C 12 -2-las To Sea Sand and Claysmentioning

confidence: 99%

Effect of sediment properties on the sorption of C12-2-LAS in marine and estuarine sediments

Rico-Rico

Temara

Behrends

et al. 2009

Environmental Pollution

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Sorption of C 12 -2-LAS to marine sediments mainly depends on both clay and organic carbon content. The importance of each parameter varies with the surfactant concentration. a r t i c l e i n f o a b s t r a c tLinear alkylbenzene sulfonates (LAS) are anionic high production volume surfactants used in the manufacture of cleaning products. Here, we have studied the effect of the characteristics of marine and estuarine sediments on the sorption of LAS. Sorption experiments were performed with single sediment materials (pure clays and sea sand), with sediments treated to reduce their organic carbon content, and with field marine and estuarine sediments. C 12 -2-LAS was used as a model compound. Sorption to the clays montmorillonite and kaolinite resulted in non-linear isotherms very similar for both clays. When reducing the organic content, sorption coefficients decreased proportionally to the fraction removed in fine grain sediments but this was not the case for the sandy sediment. The correlation of the sediment characteristics with the sorption coefficients at different surfactant concentrations showed that at concentrations below 10 mg C 12 -2-LAS/L, the clay content correlated better with sorption, while the organic fraction became more significant at higher concentrations.

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“…Therefore, the strong sorption of Eu 3? onto Th 4 (PO 4 ) 4 P 2 O 7 is mainly attributed to surface complexation or strong chemical sorption rather than electrostatic sorption [39].…”

Section: Effects Of Eu(iii) Concentration In Solutionmentioning

confidence: 99%

Sorption of Eu(III) on Th4(PO4)4P2O7: effects of pH, complexing anions and fulvic acid

Qian

Cui

Liu

et al. 2015

J Radioanal Nucl Chem

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The sorption of Eu(III) on Th 4 (PO 4 ) 4 P 2 O 7 was studied under ambient conditions using the batch technique. The effects of pH, the concentrations of Eu(III) on Th 4 (PO 4 ) 4 P 2 O 7 sorption were investigated. The sorption characteristics of sulfate, phosphate and fulvic acid (FA) on Th 4 (PO 4 ) 4 P 2 O 7 was explored in the presence Eu(III). The results indicated that sorption of Eu(III) on Th 4 (PO 4 ) 4 P 2 O 7 was strongly affected by pH and the concentrations of Eu(III). Eu(III) sorption onto Th 4 (PO 4 ) 4 P 2 O 7 was greatly enhanced in FA and phosphate media than in KNO 3 . The Langmuir, Freundlich and D-R model were used to simulate the sorption isotherms of Eu(III) at four different medium. FA sorption isotherm can be described by Langmuir model in presence and absence of Eu(III) in solution.

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Europium retention onto clay minerals from 25 to 150°C: Experimental measurements, spectroscopic features and sorption modelling

Cited by 177 publications

References 51 publications

Preparation and structure’s analyses of lanthanide (Ln) -exchanged bentonites

Preparation and structure’s analyses of lanthanide (Ln) -exchanged bentonites

Effect of sediment properties on the sorption of C12-2-LAS in marine and estuarine sediments

Sorption of Eu(III) on Th4(PO4)4P2O7: effects of pH, complexing anions and fulvic acid

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