Actinides sorption onto hematite:
experimental data, surface complexation modeling and linear free energy
relationship

Romanchuk, Anna Yu.; Kalmykov, Stepan N.

doi:10.1515/ract-2014-2108

Cited by 24 publications

(22 citation statements)

References 32 publications

(65 reference statements)

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“…15,23,25 Contrary to most other modeling efforts within that system, only one Np(V) surface complex was taken into account due to our spectroscopic evidence. The degree of hydrolysis of the surface species was accounted for using fit exercises (eq 1 with n varied between 0 and 3).…”

Section: ■ Experimental Sectionmentioning

confidence: 99%

In situ Spectroscopic Identification of Neptunium(V) Inner-Sphere Complexes on the Hematite–Water Interface

Müller

Gröschel

Roßberg

et al. 2015

Environ. Sci. Technol.

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Hematite plays a decisive role in regulating the mobility of contaminants in rocks and soils. The Np(V) reactions at the hematite-water interface were comprehensively investigated by a combined approach of in situ vibrational spectroscopy, X-ray absorption spectroscopy and surface complexation modeling. A variety of sorption parameters such as Np(V) concentration, pH, ionic strength, and the presence of bicarbonate was considered. Time-resolved IR spectroscopic sorption experiments at the iron oxide-water interface evidenced the formation of a single monomer Np(V) inner-sphere sorption complex. EXAFS provided complementary information on bidentate edge-sharing coordination. In the presence of atmospherically derived bicarbonate the formation of the bis-carbonato inner-sphere complex was confirmed supporting previous EXAFS findings.1 The obtained molecular structure allows more reliable surface complexation modeling of recent and future macroscopic data. Such confident modeling is mandatory for evaluating water contamination and for predicting the fate and migration of radioactive contaminants in the subsurface environment as it might occur in the vicinity of a radioactive waste repository or a reprocessing plant.

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Section: ■ Experimental Sectionmentioning

confidence: 99%

In situ Spectroscopic Identification of Neptunium(V) Inner-Sphere Complexes on the Hematite–Water Interface

Müller

Gröschel

Roßberg

et al. 2015

Environ. Sci. Technol.

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“…A pronounced rise of Eu (III) sorption from 0 to 100% is observed within pH values 2-4. The typical pH range of the trivalent metal cations sorption edge on different oxide surfaces is within 2-6 [3,[30][31][32]. Thus, H-titanates demonstrate very strong binding with Eu (III).…”

Section: Discussionmentioning

confidence: 99%

Sorption of Eu (III) onto Nano-Sized H-Titanates of Different Structures

et al. 2019

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Hydrogen titanates (H-titanates) of different nanostructures (nanotubes, nanowires, nanosheets) have been synthesized by hydrothermal methods. The europium (III) sorption from aqueous solutions onto nano-sized H-titanates was studied as a function of contact time, pH values, and initial Eu (III) concentration in batch experiments. Reversibility of adsorption of europium has been investigated as well. Nano-sized H-titanates can be used for tri-valent f-elements removal in polluted water treatment due to fast and efficient sorption of Eu (III).

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“…Similarly co-precipitation with different metal hydroxides has also been reported from neutral or alkaline media [25]. Sorption of Am(III) on inorganic exchangers from near neutral media has also been reported [26,27]. However, only a few studies have described the separation of americium from highly acidic medium.…”

Section: Introductionmentioning

confidence: 90%

Removal of americium from effluent generated during the purification of plutonium by anion exchange

2015

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Studies have been carried out on removal of americium from the effluent generated during anion exchange purification of plutonium. Americium 241, generated by the beta decay of Plutonium-241, is the major source of activity in this highly acidic effluent and its removal would render the waste easily disposable. A simple and effective co-precipitation method, using thorium oxalate has been investigated for the treatment of this alpha active aqueous waste. Experiments have been carried out to identify optimum conditions to obtain high percentage co-precipitation with minimum amount of co-precipitant. Efforts were carried out to correlate the optimum conditions of co-precipitation of americium obtained in these experiments with solubility of thorium oxalate and americium oxalate calculated from solubility products of these compounds, stability constants of thorium and americium oxalate complexes taken from literature. The saturation capacity of thorium oxalate for Am(III) was also calculated by analyzing the d value data using Langmuir adsorption equation. The strong tendency of americium to get coprecipitated and the high capacity exhibited by thorium oxalate for the uptake of americium indicate feasibility of using this method for the treatment of anion exchange effluent.

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Actinides sorption onto hematite: experimental data, surface complexation modeling and linear free energy relationship

Cited by 24 publications

References 32 publications

In situ Spectroscopic Identification of Neptunium(V) Inner-Sphere Complexes on the Hematite–Water Interface

In situ Spectroscopic Identification of Neptunium(V) Inner-Sphere Complexes on the Hematite–Water Interface

Sorption of Eu (III) onto Nano-Sized H-Titanates of Different Structures

Removal of americium from effluent generated during the purification of plutonium by anion exchange

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