Exchange properties of ammonium salts of 12-heteropolyacids—IV

Krtil, J.

doi:10.1016/0022-1902(62)80259-0

Cited by 41 publications

(5 citation statements)

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“…The acid salts of molybdophosphoric acid do not set free a metal ion for the formation of associates because the two available metal ions cannot be exchanged by a proton [4,14,15]. In agreement with this, technetium is not sorbed by these sorbents over the whole range of nitric acid concentration.…”

Section: Discussionsupporting

confidence: 66%

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Sorption of Pertechnetate by Salts of Molybdophosphoric Acid

Suss¹,

Pfrepper²

1983

Radiochimica Acta

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Acid solutions /Pertechnetate /Molybdophosphoric acid SummaryThe sorption of pertechnetate on salts of molybdophosphoric acid from nitric acid and in the presence of electrolytes was investigated. Distribution coefficients from 10 to 100 ml/g were found. The sorption of pertechnetate can be increased by the addition of K + , NhJ, Rb + and Cs + salts.A saturation capacity of ~ 0,19 mmol/g ammonium phosphomolybdate was found from the adsorption isotherms.The formation of alkali metal pertechnetate associates in the sorbent phase is supposed.

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Section: Discussionsupporting

confidence: 66%

“…These cations are set free from the sorbents by M + -H + ion exchange, and they are able to form the corresponding associates in the outer phase. This exchange increases with the increase of the acid concentration [14,15]. This is also the interpretation for the dependence of the distribution coefficients on the phase ratio ( Table 1).…”

Section: Discussionmentioning

confidence: 69%

Sorption of Pertechnetate by Salts of Molybdophosphoric Acid

Suss¹,

Pfrepper²

1983

Radiochimica Acta

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“…These references [3 -18] refer to the chemical composition, production procedure and their application for cesium separation mostly performed for sea water and in alkaline medium. For HCl and HN0 3 media Brought to you by | New York University Bobst Library Technical Services Authenticated Download Date | 6/28/15 12:37 AM some data are available in particular for AMP-1 [4,5] and HAP [12], but not for sorption of cesium in nitric acid solutions in presence of high salt concentrations occuring in PUREX PROCESS. CSN0 3 was used as cesium carrier and 132 Cs (Ey = 668 keV, tl/2 = 6.47 d) as tracer for the radioactive γ-measurement, which was performed with an intrinsic Ge-detector of a FWHM = 1.7 keV and an efficiency of 15% at the 1332 keV line of 60 Co, relative to a 3 χ 3 inch planar Nal-detector.…”

Section: Methodsmentioning

confidence: 97%

Separation of Cesium from Acid ILW-Purex Solutions by Sorption on Inorganic Ion Exchangers

Faubel

Ali

1986

Radiochimica Acta

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The separation of cesium by use of the inorganic ion exchanger ammonium molybdatophosphate from nitric acid solutions of intermediate level waste (ILW) from reprocessing of spent fuel elements according to the PUREX PROCESS has been demonstrated.Other inorganic exchange materials have shown high sorption values only for certain pH ranges: -ammonium hexacyano cobaltous ferrate (pH 12, 35 g Cs/kg) -potassium hexacyano nickel ferrate (pH 10, 30 g Cs/kg) -zirconium phosphate (pH 7, 100 g Cs/kg) -titanium phosphate (pH 7, 15 g Cs/kg) -antimony pentoxide (pH 2, 30 g Cs/kg) -titanium oxide (pH 7, 1 g Cs/kg) Except for high salt loading of 3.6 AT NaN0 3 , a significant loss of capacities usually occurs; this does not allow the use of these exchangers. However, ammonium molybdatophosphate shows excellent performance with high salt loadings and in a broad pHrange from pH 9 to conc. HN0 3 with a breakthrough-capacity of 60 g Cs/kg.

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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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Exchange properties of ammonium salts of 12-heteropolyacids—IV

Cited by 41 publications

References 5 publications

Sorption of Pertechnetate by Salts of Molybdophosphoric Acid

Sorption of Pertechnetate by Salts of Molybdophosphoric Acid

Separation of Cesium from Acid ILW-Purex Solutions by Sorption on Inorganic Ion Exchangers

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

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