Exchange properties of ammonium salts of 12-heteropolyacids. Sorption of caesium on ammonium phosphotungstate and phosphomolybdate

Krtil, J.; Kouřím, V.

doi:10.1016/0022-1902(60)80390-9

Cited by 35 publications

(11 citation statements)

References 4 publications

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“…The metal molybdophosphate (MMP) has attracted considerable attention based on its high specificity adsorption of ions and stability in acidic environments [ 92 ]. Nevertheless, the small particle size (1–5 µm [ 93 ]) of MMP microcrystalline structure is impervious to liquids, preventing its use in column processes in pure form. A promising method to realize the full use of MMP is to immobilize it and insert supporting materials.…”

Section: Porous Silica-based Nanoparticles Modified By Inorganic Mmentioning

confidence: 99%

Functionalized Porous Silica-Based Nano/Micro Particles for Environmental Remediation of Hazard Ions

Wang

Jiao

et al. 2019

Nanomaterials

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The adsorption and separation of hazard metal ions, radioactive nuclides, or minor actinides from wastewater and high-level radioactive waste liquids using functional silica-based nano/micro-particles modified with various inorganic materials or organic groups, has attracted significant attention since the discovery of ordered mesoporous silica-based substrates. Focusing on inorganic and organic modified materials, the synthesis methods and sorption performances for specific ions in aqueous solutions are summarized in this review. Three modification methods for silica-based particles, the direct synthesis method, wetness impregnation method, and layer-by-layer (LBL) deposition, are usually adopted to load inorganic material onto silica-based particles, while the wetness impregnation method is currently used for the preparation of functional silica-based particles modified with organic groups. Generally, the specific synthesis method is employed based on the properties of the loading materials and the silicon-based substrate. Adsorption of specific toxic ions onto modified silica-based particles depends on the properties of the loaded material. The silicon matrix only changes the thermodynamic and mechanical properties of the material, such as the abrasive resistance, dispersibility, and radiation resistance. In this paper, inorganic loads, such as metal phosphates, molybdophosphate, titanate-based materials, and hydrotalcite, in addition to organic loads, such as 1,3-[(2,4-diethylheptylethoxy)oxy]-2,4-crown-6-Calix{4}arene (Calix {4}) arene-R14 and functional 2,6-bis-(5,6-dialkyl-1,2,4-triazin-3-yl)-pyridines(BTP) are reviewed. More specifically, we emphasize on the synthesis methods of such materials, their structures in relation to their capacities, their selectivities for trapping specific ions from either single or multi-component aqueous solutions, and the possible retention mechanisms. Potential candidates for remediation uses are selected based on their sorption capacities and distribution coefficients for target cations and the pH window for an optimum cation capture.

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Section: Porous Silica-based Nanoparticles Modified By Inorganic Mmentioning

confidence: 99%

Functionalized Porous Silica-Based Nano/Micro Particles for Environmental Remediation of Hazard Ions

Wang

Jiao

et al. 2019

Nanomaterials

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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%

“…[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. Despite the zeolites' low-costs and high capacities, they show low-selectivity towards Cs + ions, while the cyanoferrates are highly selective, but cannotb eu tilized in ion-ex-changec olumns.…”

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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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“…AMP seems to be promising in removing radioactive Cs from acidic solutions, but it is difficult to apply AMP in column operation due to its microcrystalline structure with particle sizes in the range of 1-5 μm [21]. These small particles are impervious to liquid.…”

Section: Introductionmentioning

confidence: 99%

Selective Cs-removal from highly acidic spent nuclear fuel solutions

et al. 2020

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AbstractThirty liters of highly acidic spent nuclear fuel solutions need to be disposed at the “Hot Laboratory (hotlab)” facility in Paul Scherrer Institut (PSI), Switzerland. In order to significantly reduce the γ dose rate before proper disposal treatment, 137Cs must be removed. In the here presented sub-project, the ion-exchange method was evaluated. Two promising sorbents, CLEVASOL® and AMP (ammonium molybdophosphate), and two derived products AMP_PAN (AMP immobilized in polyacrylonitrile) and AMP/SiO2 (AMP immobilized on silica gel) were tested by the batch method using model solutions of important high-yield fission products (Cs, Eu, Zr, Ru, Pd and Ag), as well as U and Pu. The results showed that AMP, AMP/SiO2 and AMP_PAN have higher selectivity for Cs than CLEVASOL® in 0.1–8 M (mol/L) HNO3 solutions. 4 M HNO3 solution was identified as the most suitable condition for Cs-removal with AMP, AMP_PAN and AMP/SiO2 due to the still sufficiently high separation factor of Cs from other metal ions and an acceptable volume increase factor after dilution. The follow-up kinetic studies on AMP, AMP_PAN and AMP/SiO2 indicated that although Cs exchange on AMP and AMP/SiO2 is faster than on AMP_PAN in the first 5 min, they all nearly reach equilibrium after 30 min of contacting time. The isotherm curves of Cs adsorption on AMP, AMP_PAN and AMP/SiO2 in 4 M HNO3 showed that the maximum sorption capacity of Cs is reached asymptotically. The results from Langmuir isotherm modeling agree with results from other publications.

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Exchange properties of ammonium salts of 12-heteropolyacids. Sorption of caesium on ammonium phosphotungstate and phosphomolybdate

Cited by 35 publications

References 4 publications

Functionalized Porous Silica-Based Nano/Micro Particles for Environmental Remediation of Hazard Ions

Functionalized Porous Silica-Based Nano/Micro Particles for Environmental Remediation of Hazard Ions

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

Selective Cs-removal from highly acidic spent nuclear fuel solutions

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