Sorption and desorption of thorium from aqueous solutions by montmorillonite

Akçay, Hüsamettin; Kılınç, Selçuk

doi:10.1007/bf02162225

Cited by 13 publications

(2 citation statements)

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“…Different types of materials have been used as adsorbents for thorium adsorption, such as activated carbons and zeolites (Metaxas et al, 2003;Dyer and Jozefowicz, 1992), gibbsite (Hongxia et al, 2006), alumina, silica (Weijuan and Zuyi, 2002), ignited Sarcotragus muscarum (Aslani et al, 2001), molecular sieve powder (Qadeer et al, 1995) and montmorillonite (Akcay and Kılınc, 1996), but no data were available for its adsorption on expanded perlite.…”

Section: Introductionmentioning

confidence: 98%

Adsorption of thorium from aqueous solutions by perlite

Talip

Eral

Hiçsönmez

2009

Journal of Environmental Radioactivity

137

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Section: Introductionmentioning

confidence: 98%

Adsorption of thorium from aqueous solutions by perlite

Talip

Eral

Hiçsönmez

2009

Journal of Environmental Radioactivity

137

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“…It is also useful as a tracer when studying important environmental processes; hence several processes affecting the mobility and the solubility of thorium in natural waters have been investigated − . The sorption of Th(IV) onto mineral surfaces has been sparingly studied, with silica , , clay minerals , hematite and goethite − , alumina , , or titania . Because sorption data on magnetite and ferrihydrite are missing in the literature, we studied in this work the sorption of Th(IV) onto these solids as a function of Th(IV) concentration.…”

Section: Introductionmentioning

confidence: 99%

Sorption of Th(IV) onto Iron Corrosion Products: EXAFS Study

Seco

Hennig

Pablo

et al. 2009

Environ. Sci. Technol.

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Long-term performance assessment of nuclear waste repositories is affected by the ability of the outer barrier systems to retain radionuclides after possible corrosive leakage of waste containers. The mobility of the radionuclides released from the spent fuel depends strongly on the processes that take place in the backfill material. The interaction of steel corrosion products and radionuclides is part of such a scenario. In this work, the sorption of Th(IV) onto 2-line-ferrihydrite (FeOOH x H2O) and magnetite (Fe3O4), used as models for steel corrosion products, has been studied using EXAFS spectroscopy. Sorption samples were prepared in 0.1 M NaClO4 solutions at acidic pH (initial pH values in the range 3.0-4.2) either from undersaturation and supersaturation conditions with respect to amorphous ThO2. Two oxygen subshells, one at 2.37 A and another at 2.54 A, were observed in the first hydration sphere of Th in the case of the ferrihydrite samples. Th-Fe distances for the different ferrihydrite samples are approximately 3.60 A. These results indicate a corner sharing surface complex of Th(IV) ion onto the ferrihydrite surface where the Th atom shares one O atom with each of two coordinated octahedra. The longer Th-O distance accounts for coordinated water molecules. No significant changes in the structural environment of Th in terms of coordination numbers and distances were detected as a function of Th(IV) concentration. Magnetite samples sorbing Th(IV) also showed also a strong distortion of the O shell, but in contrast to ferrihydrite, two types of nearest Fe atoms were detected at 3.50 A and 3.70 A. These results indicate that Th(IV) ion sorbs onto the magnetite surface as bidentate-corner sharing arrangements to [FeO6] octahedra and [FeO4] tetrahedra.

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Interaction of Actinides with Natural Microporous Materials

Μisaelides

Γοδελίτσας

1999

Natural Microporous Materials in Environmental Technology

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Sorption and desorption of thorium from aqueous solutions by montmorillonite

Cited by 13 publications

References 14 publications

Adsorption of thorium from aqueous solutions by perlite

Adsorption of thorium from aqueous solutions by perlite

Sorption of Th(IV) onto Iron Corrosion Products: EXAFS Study

Interaction of Actinides with Natural Microporous Materials

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