Ion Exchange Studies for Removal of Sulfate from Hanford Tank Waste Envelope C (241-AN-107) Using SuperLig 655 Resin

Kurath, D.E.; Bontha, J.R.; Blanchard, DL; Fiskum, SK; Rapko, BM

doi:10.2172/760428

Cited by 3 publications

(4 citation statements)

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“…However, a novel proprietary resin tested on Hanford supernatant tank waste turned out to be ineffective because of either a lack of sufficient sulfate affinity or its apparent degradation. 41,89 Although liquid−liquid extraction is normally associated with high selectivity, it generally selects against sulfate and thus has not proved very useful for applications where the competitive extraction of sulfate from other electrolyte ions is required. Sulfate extraction is a challenge owing to the high hydration energy of this particular dianion, −1090 kJ/mol, compared with hydration energies of −306 kJ/mol for nitrate and −347 kJ/mol for chloride.…”

Section: Traditional Separation Methodsmentioning

confidence: 99%

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A Case for Molecular Recognition in Nuclear Separations: Sulfate Separation from Nuclear Wastes

et al. 2012

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In this paper, we present the case for molecular-recognition approaches for sulfate removal from radioactive wastes via the use of anion-sequestering systems selective for sulfate, using either liquid-liquid extraction or crystallization. Potential benefits of removing sulfate from the waste include improved vitrification of the waste, reduced waste-form volume, and higher waste-form performance, all of which lead to potential cleanup schedule acceleration and cost savings. The need for sulfate removal from radioactive waste, especially legacy tank wastes stored at the Hanford site, is reviewed in detail and primarily relates to the low solubility of sulfate in borosilicate glass. Traditional methods applicable to the separation of sulfate from radioactive wastes are also reviewed, with the finding that currently no technology has been identified and successfully demonstrated to meet this need. Fundamental research in the authors' laboratories targeting sulfate as an important representative of the class of oxoanions is based on the hypothesis that designed receptors may provide the needed ability to recognize sulfate under highly competitive conditions, in particular where the nitrate anion concentration is high. Receptors that have been shown to have promising affinity for sulfate, either in extraction or in crystallization experiments, include hexaurea tripods, tetraamide macrocycles, cyclo[8]pyrroles, calixpyrroles, and self-assembled urea-lined cages. Good sulfate selectivity observed in the laboratory provides experimental support for the proposed molecular-recognition approach.

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Section: Traditional Separation Methodsmentioning

confidence: 99%

“…No attempts to use strong-base resins for this application have been reported. However, a novel proprietary resin tested on Hanford supernatant tank waste turned out to be ineffective because of either a lack of sufficient sulfate affinity or its apparent degradation. , …”

Section: Traditional Separation Methods Applicable To Sulfatementioning

confidence: 99%

A Case for Molecular Recognition in Nuclear Separations: Sulfate Separation from Nuclear Wastes

et al. 2012

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“…Numerous techniques have been studied for the removal of SO 4 2− from aqueous solutions including but not limited to molecular recognition, 1 precipitation, 5 ion-exchange, 6 reverse osmosis, 7 and adsorption. 8 Yet to be developed, however, is a material or technology that is promising for large-scale implementation at nuclear waste sites.…”

Section: Introductionmentioning

confidence: 99%

Efficient extraction of sulfate from water using a Zr-metal–organic framework

et al. 2016

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A Zr-based MOF, NU-1000, comprised of Zr6 nodes and tetratopic pyrene-containing linkers is studied for adsorption and extraction of SO4(2-) from water. The adsorption capacity and uptake time of SO4(2-) in NU-1000 is determined at varying concentrations to give an overall maximum adsorption capacity of 56 mg SO4(2-) per g of MOF. Selective adsorption of SO4(2-) by NU-1000 in the presence of other anions as well as regeneration of the sorbent is also explored.

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“…24 Considerable effort has been devoted to the synthesis of receptors that might allow the removal of sulfate from the highly basic nitrate-rich mixtures produced by the pretreatment of the original radioactive waste with NaOH. 25 Consequently, one of the current challenges in anion recognition chemistry involves the preparation of receptors that show high sulfate/nitrate selectivity. 26 Sulfate recognition in aqueous media is difficult because of its high hydration energy (ΔG h = −1080 kJ mol −1 vs. −300 kJ mol −1 for nitrate), 27 and extreme hydrophilicity according to the Hofmeister series.…”

Section: Introductionmentioning

confidence: 99%

A case of oxoanion recognition based on combined cationic and neutral C–H hydrogen bond interactions

et al. 2015

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A novel bidentate bis-(benzimidazolium) receptor containing pyrene as fluorescent signaling units has been synthesized. Fluorescence and NMR spectroscopy studies reveal that this receptor exclusively recognizes sulphate and hydrogenpyrophosphate in the competitive water-DMSO (1 : 9) medium; significant downfield shifts were observed for the C(2)-H protons of both the imidazolium groups, and appreciable downfield shifts were also observed for the inner naphthalene protons indicating their participation in hydrogen bonding with anions along with the C(2) imidazolium protons. The calculated association constants from (1)H NMR and fluorescence titrations demonstrate that the receptor binds sulphate stronger than hydrogenpyrophosphate anions.

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Ion Exchange Studies for Removal of Sulfate from Hanford Tank Waste Envelope C (241-AN-107) Using SuperLig 655 Resin

Cited by 3 publications

References 1 publication

A Case for Molecular Recognition in Nuclear Separations: Sulfate Separation from Nuclear Wastes

A Case for Molecular Recognition in Nuclear Separations: Sulfate Separation from Nuclear Wastes

Efficient extraction of sulfate from water using a Zr-metal–organic framework

A case of oxoanion recognition based on combined cationic and neutral C–H hydrogen bond interactions

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