Copper ferrocyanide — polyurethane foam as a composite ion exchanger for removal of radioactive cesium

Rao, Shodhan; Lal, K. B.; Narasimhan, S.V.; Ahmed, Jaleel

doi:10.1007/bf02349164

Cited by 23 publications

(10 citation statements)

References 18 publications

(2 reference statements)

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“…Taking into account the difference in affinities of PAA and PEI cryogels toward Cu(II) ions, we have investigated how a polymer matrix affects the efficiency of composite sorbents containing Cu(II) ferrocyanide for cesium ion removal. Transition metal ferrocyanides are the most efficient materials for selective uptake of cesium radionuclides from liquid radioactive wastes and natural waters; however, due to their small size and low mechanical strength, they cannot be used in columns without immobilization in organic or inorganic matrices, which can be realized under dynamic conditions [ 44 , 45 , 46 , 47 ]. Polymeric ligands can be used for the fabrication of such composite sorbents with several routes, in most cases, mechanically stable granulated materials were obtained by co-precipitation of polymer with transition metal ions and potassium ferrocyanide [ 48 , 49 ], but an inorganic phase can be also formed in situ via sequential loading of transition metal ions and [Fe(CN) 6 ] 4− anion [ 33 , 50 ].…”

Section: Resultsmentioning

confidence: 99%

Rational Design of Polyamine-Based Cryogels for Metal Ion Sorption

et al. 2020

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Here we report the method of fabrication of supermacroporous monolith sorbents (cryogels) via covalent cross-linking of polyallylamine (PAA) with diglycidyl ether of 1,4-butandiol. Using comparative analysis of the permeability and sorption performance of the obtained PAA cryogels and earlier developed polyethyleneimine (PEI) cryogels, we have demonstrated the advantages and disadvantages of these polymers as sorbents of heavy metal ions (Cu(II), Zn(II), Cd(II), and Ni(II)) in fixed-bed applications and as supermacroporous matrices for the fabrication of composite cryogels containing copper ferrocyanide (CuFCN) for cesium ion sorption. Applying the rate constant distribution (RCD) model to the kinetic curves of Cu(II) ion sorption on PAA and PEI cryogels, we have elucidated the difference in sorption/desorption rates and affinity constants of these materials and showed that physical sorption contributed to the Cu(II) uptake by PAA, but not to that by PEI cryogels. It was shown that PAA cryogels had significantly higher selectivity for Cu(II) sorption in the presence of Zn(II) and Cd(II) ions in comparison with that of PEI cryogels, while irreversible sorption of Co(II) ions by PEI can be used for the separation of Ni(II) and Co(II) ions. Using IR and Mössbauer spectroscopy, we have demonstrated that strong complexation of Cu(II) ions with PEI significantly affects the in situ formation of Cu(II) ferrocyanide nanosorbents leading to their inefficiency for Cs+ ions selective uptake, whereas PAA cryogel was applicable for the fabrication of efficient monolith composites via the in situ formation of CuFCN or loading of ex situ formed CuFCN colloids.

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Section: Resultsmentioning

confidence: 99%

Rational Design of Polyamine-Based Cryogels for Metal Ion Sorption

et al. 2020

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“…However, as most cesium salts share a high solubility in water, the common precipitation techniques are often ineffective . Consequently, many studies have focused on ion‐exchange procedures based on two main matrices: the first are natural or synthetic zeolites, while the second uses transition metal cyanoferrates (Co, Ni, Cu, Zn) or ammonium phosphomolybdates . Yet again, also these methods are far from ideal.…”

Section: Figurementioning

confidence: 99%

“…[1] Over the last three decades, following the 1986 Chernobyl and the more recent 2011F ukushima nuclear disasters, [2][3][4] much research has been devotedt of indingp ractical ways for the selective 137 Cs-removal from waste and contaminatedw ater.T he standard methods for the task include precipitation,i on-exchange and extraction,u sing ar ange of precipitating ande xtracting [5] agents.H owever,a sm ost cesium salts share ah igh solubility in water,t he common precipitation techniques are often ineffective. [6,7] Consequently,m any studies have focused on ion-exchangep rocedures based on two main matrices:t he first are naturalo rs ynthetic zeolites, [8] while the secondu ses transition metal cyanoferrates (Co, Ni, Cu, Zn) [9][10][11] or ammonium phosphomolybdates. [12] Yeta gain, also these methods are far from ideal.…”

mentioning

confidence: 99%

Selective Binding and Precipitation of Cesium Ions from Aqueous Solutions: A Size‐Driven Supramolecular Reaction

Bengiat

Bogoslavsky

Mandler

et al. 2018

Chemistry A European J

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The nuclear disasters of Chernobyl and Fukushima presented an urgent need for finding solutions to treatment of radioactive wastes. Among the by-products of nuclear fission is radioactive Cs, which evokes an environmental hazard due to its long half-life (>30 years) and high solubility in water. In this work, a water-soluble organic ligand, readily obtained from alloxan and 1,3,5-benzenetriol, has been found to selectively bind and precipitate Cs ions from aqueous solutions. The special rigid structure of the ligand, which consists of a "tripodal" carbonyl base above and below an aromatic plane, contributes to the size-driven selectivity towards the large Cs ions and the formation of a giant, insoluble supramolecular complex. In addition to the low costs of the ligand, high yields and effectiveness in precipitating Cs ions, the Cs-complex revealed a high endurance to continuous doses of γ-radiation, increasing its potential to act as a precipitating agent for Cs.

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“…In the 80 s, zeolite because of its strong ability of ion exchange began to attract the attention of people, zeolite, including a lot of kinds, such as clinoptilolite, ling zeolite. The earliest use of it for metal strontium and cesium adsorption was studied [12] , in more than 40 clinoptilolite zeolite content is the most abundant in nature. Clinoptilolite has a strong adsorption capacity of heavy metals to adsorb Pb 2+ and Cd 2+ , Zn 2+ and Cu 2+ ions [13] .…”

Section: Zeolitementioning

confidence: 99%