Ion-exchange and sorption kinetics of cesium and strontium in soils

Liu, Dai-Chin; Hsu, Chao-Hsing; Chuang, Chi-Lung

doi:10.1016/0969-8043(95)00175-d

Cited by 25 publications

(15 citation statements)

References 9 publications

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“…The data indicate fast accumulation of the ions at the kaolinite surface followed by a partial desorption leading to equilibrium attainment. A sorption reaction is believed to pass through three steps [20]: film diffusion, particle diffusion, and finally the exchange reaction at the sorption site. The behavior reported above might indicate that at higher loadings of Cs + , intrinsic sorption (or exchange reaction) on kaolinite sites becomes slower than the rate of transfer of Cs + ions from the bulk to the sorption layer, the thing probably stemming from the competition between the sorbate ions towards the limited number of sorption sites on kaolinite.…”

Section: Kinetic Analysismentioning

confidence: 99%

Physicochemical characterization of the retardation of aqueous Cs+ ions by natural kaolinite and clinoptilolite minerals

Shahwan

Akar

Eroğlu

2005

Journal of Colloid and Interface Science

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The aim of this study was to carry out kinetic, thermodynamic, and surface characterization of the sorption of Cs + ions on natural minerals of kaolinite and clinoptilolite. The results showed that sorption followed pseudo-second-order kinetics. The activation energies were 9.5 and 13.9 kJ/mol for Cs + sorption on kaolinite and clinoptilolite, respectively. Experiments performed at four different initial concentrations of the ion revealed that the percentage sorption of Cs + on clinoptilolite ranged from 90 to 95, compared to 28 to 40 for the kaolinite case. At the end of a 1 week period, the percentage of Cs + desorption from clinoptilolite did not exceed 7%, while it amounted to more than 30% in kaolinite, indicating more stable fixation by clinoptilolite. The sorption data were best described using Freundlich and D-R isotherm models. Sorption showed spontaneous and exothermic behavior on both minerals, with H 0 being −6.3 and −11.4 kJ/mol for Cs + uptake by kaolinite and clinoptilolite, respectively. Expanding the kaolinite interlayer space from 0.71 to 1.12 nm using DMSO intercalation, did not yield a significant enhancement in the sorption capacity of kaolinite, indicating that the surface and edge sites of the clay are more energetically favored. EDS mapping and elemental analysis of the surface of kaolinite and clinoptilolite revealed more intense signals on the surface of the latter with an even distribution of sorbed Cs + onto the surfaces of both minerals.

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Section: Kinetic Analysismentioning

confidence: 99%

Physicochemical characterization of the retardation of aqueous Cs+ ions by natural kaolinite and clinoptilolite minerals

Shahwan

Akar

Eroğlu

2005

Journal of Colloid and Interface Science

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“…Lagergren's equation [49], developed as a pseudo first order kinetics, was applied to fit the kinetic data of the NMG-MCM-41(3) (inset of Fig. 9).…”

Section: Boron Sorption Kineticsmentioning

confidence: 99%

Synthesis, characterization and application of a novel sorbent, glucamine-modified MCM-41, for the removal/preconcentration of boron from waters

Kaftan

Açıkel

Eroğlu

et al. 2005

Analytica Chimica Acta

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A novel sorbent was prepared by the functionalization of an inorganic support material, MCM-41, with N-methylglucamine for the uptake of boron from aqueous solutions prior to its determination by inductively coupled plasma optical emission spectrometry (ICP-OES). Characterization of the newly synthesized material was performed using BET, XRD, TEM, SEM and DRIFTS techniques, in addition to its C and N elemental content. Sorption behavior of the novel sorbent for boron was also investigated and found to obey Freundlich and Dubinin-Radushkevich (D-R) isotherm models. The maximum amount of B (as H 3 BO 3 ) that can be sorbed by the sorbent was calculated from the D-R isotherm and was found to be 0.8 mmol B g −1 of sorbent. The applicability of the new sorbent for the removal/preconcentration of boron from aqueous samples was examined by batch method. It was found that the sorbent can take up 85% of boron in 5 min whereas quantitative sorption is obtained in 30 min. Any pH greater than 6 can be used for sorption. Desorption from the sorbent was carried out using 1.0 M HNO 3 . The sorption efficiency of the new sorbent was also compared to that of Amberlite IRA 743, a commercial resin with N-methylglucamine functional groups. Within the experimental conditions employed, the new sorbent was found to have higher sorption efficiency than the commercial resin. For method validation, spike recovery tests were performed at various concentration levels in different water types and were found to be between 83-95 and 75-92% for ultra pure water and geothermal water, respectively.

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“…Le travail présenté ci-après repose sur l'établissement d'une base de données de Kd ; celle-ci comporte l'ensemble des valeurs « sources » qui ont servi à définir les valeurs génériques de l'AIEA en 1994 et du DOE auxquelles ont été adjoints les résultats de publications récentes, en général postérieures à 1994. Yu et al, 2001 ; Valeur fausse, la valeur de la publication qui fait référence Liu et al, 1995 ;Poinssot et al, 1999). Ce mécanisme concerne surtout les montmorillonites (illite ou vermiculite) dans lesquelles les charges négatives sont compensées par les cations majeurs du sol (en particulier K + ).…”

Section: Analyse Des Valeurs De Kdunclassified

“…En revanche, la fraction échangeable du radio-strontium -exogène -déterminée par extractions séquentielles atteint plusieurs dizaines de pour cent, voire davantage dans les sols organiques soumis à quelques mois de vieillissement (Forsberg et al, 2001). Le strontium s'adsorbe fortement par échange cationique réversible et/ou adsorption sur les hydroxydes d'aluminium (Liu et al, 1995 ;Khan et al, 1995). Il se fixe relativement bien sur les oxydes de manganèse (Kd variant de 2 à 100 L kg -1 ) entre 4 et 25 °C ; sa sorption sur les oxydes de fer est faible (Kd < 1 L kg -1 ; Trivedi et Axe, 1999).…”

Section: Strontiumunclassified

Comportement de radionucléides (Cs, I, Sr, Se, Tc) dans le sol : proposition de valeurs de Kd par défaut

Roussel-Debet

Colle

2005

Radioprotection

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Ion-exchange and sorption kinetics of cesium and strontium in soils

Cited by 25 publications

References 9 publications

Physicochemical characterization of the retardation of aqueous Cs+ ions by natural kaolinite and clinoptilolite minerals

Physicochemical characterization of the retardation of aqueous Cs+ ions by natural kaolinite and clinoptilolite minerals

Synthesis, characterization and application of a novel sorbent, glucamine-modified MCM-41, for the removal/preconcentration of boron from waters

Comportement de radionucléides (Cs, I, Sr, Se, Tc) dans le sol : proposition de valeurs de Kd par défaut

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