Sorption of rare-earth elements from seawater onto synthetic mineral particles: An experimental approach

Koeppenkastrop, Dirk; Carlo, Eric Heinen De

doi:10.1016/0009-2541(92)90015-w

Cited by 343 publications

(157 citation statements)

References 52 publications

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“…Higher coordination number is expected to restrict the bulk diffusion of an ion in its way toward the sorption site. On the contrary, opposite fractionation trends were observed for sorption of REEs from seawater onto iron and manganese oxides [20]. The behavior was attributed to the formation of more stable inorganic complexes in sea water by HREEs, and was shown to depend also on the crystallinity and particle size of the sorbent phase.…”

Section: Effect Of Shaking Time On Uptake Of Reesmentioning

confidence: 84%

Removal of aqueous rare earth elements (REEs) using nano-iron based materials

Yeşiller

Eroğlu

Shahwan

2013

Journal of Industrial and Engineering Chemistry

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The uptake of REEs was investigated using nano-zero valent iron (nZVI) and alumina-supported nZVI (Al-nZVI). The results indicated fast uptake, with saturation approached within 10 min of contact between solutions and solids. Upon using nZVI, the uptake of REEs seemed to be quantitative over the studied range of concentration; 1.0–100.0 mg L−1. When Al-nZVI was used, complete removal was achieved within the range of 1.0–10.0 mg L−1. The solids demonstrated stable performance beyond pH of 2.0, up to neutral pH conditions. Fractionation of REEs on Al-nZVI was observed. The REE ions seem to be fixed to oxide and oxyhydroxide surface groups

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Section: Effect Of Shaking Time On Uptake Of Reesmentioning

confidence: 84%

Removal of aqueous rare earth elements (REEs) using nano-iron based materials

Yeşiller

Eroğlu

Shahwan

2013

Journal of Industrial and Engineering Chemistry

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“…Thermodynamics suggest that Ce(IV) should predominate over Ce(III) at redox levels that stabilize significant amounts of (hydr)oxides of Fe(III), Mn(III), or Mn(IV), and it has been shown that the slow kinetics of the Ce(III) oxidation reaction can be overcome by microbial mediation or by surface-catalyses on Mn oxides (e.g., Moffett, 1990Moffett, , 1994Koeppenkastrop and De Carlo, 1992;De Carlo et al, 1998;and references therein). If indeed there is preferential association of Ce with Mn but not with Fe, only the Mn oxides in marine hydrogenetic Fe-Mn crusts should display a positive Ce anomaly when compared to seawater which itself is characterized by Ce depletion.…”

Section: Cerium Oxidation In the Marine Environmentmentioning

confidence: 99%

Oxidative scavenging of cerium on hydrous Fe oxide: Evidence from the distribution of rare earth elements and yttrium between Fe oxides and Mn oxides in hydrogenetic ferromanganese crusts

2009

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The distribution of the rare earths and yttrium (REY) in co-existing hydrous Mn oxides and Fe oxides that form marine hydrogenetic ferromanganese crusts is used to better describe the partitioning and fractionation of the REY between these (hydr)oxides and seawater in the natural marine system. Four fractions (easily exchangeable, Mn-oxide-bound, Fe-oxidebound, and insoluble-residue-bound REY) were separated by an adjusted sequential leaching procedure from two ferromanganese crusts from the Central Pacific. The distribution of the REY differs significantly between these leaching fractions and gives evidence for decoupling of La, Ce, Gd, Y, and Lu from their respective neighbours in the REY series during partitioning between hydrous Fe oxides, Mn oxides and seawater. Both the Mn oxides and the Fe oxides display pronounced positive Ce anomalies of almost similar size. This suggests that in the natural marine system oxidative scavenging of Ce from seawater is not restricted to Mn oxides but also occurs on hydrous Fe oxides. The distribution of Ce between the Mn oxides and the hydrous Fe oxides follows that of the trivalent REY and contrasts sharply with that of tetravalent Zr, Hf and Th. This suggests that preferential Ce removal from seawater does not result from the oxidation of dissolved Ce(III) within the marine water column, but that Ce(III) is oxidized after its sorption at the metal (hydr)oxide surface. Patterns of apparent hydrous Fe oxide/Mn oxide distribution coefficients show a sigmoidal shape and display negative anomalies for La, Gd, Y, and Lu (and the M-type lanthanide tetrad effect), indicating preferential scavenging of these elements by the Mn oxides as compared to the Fe oxides. The pronounced differences between the REY distribution in the Mn oxides and that in the Fe oxides cannot solely be explained by the REY speciation in seawater, but require additional and mineral-specific REY fractionation during surface-complexation.

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“…At low cesium concentrations, such as are likely to occur in the potential repository horizon, the clay showed a slight preference for the lanthanide ions relative to cesium, and this preference increased with temperature (30-75°C). Koeppenkastrop and De Carlo (1992; have evaluated the sorption of the rare-earth elements by iron oxides, manganese oxides, and apatite from high-ionic -strength aqueous solutions (ultraviolet-irradiated natural seawater). One nanomole of each rare-earth-element radiotracer was equilibrated with approximately 10 mg of the solid phase in 1 kg of seawater.…”

mentioning

confidence: 99%

Unsaturated Zone and Saturated Zone Transport Properties (U0100)

Conca¹

2000

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Sorption of rare-earth elements from seawater onto synthetic mineral particles: An experimental approach

Cited by 343 publications

References 52 publications

Removal of aqueous rare earth elements (REEs) using nano-iron based materials

Removal of aqueous rare earth elements (REEs) using nano-iron based materials

Oxidative scavenging of cerium on hydrous Fe oxide: Evidence from the distribution of rare earth elements and yttrium between Fe oxides and Mn oxides in hydrogenetic ferromanganese crusts

Unsaturated Zone and Saturated Zone Transport Properties (U0100)

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