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Kumar, S. S.; Sivaiah, M. V.; Venkatesan, K. A.; Krishna, Rallabhandi Murali; Murthy, G. S.; Sasidhar, P. V. K.

doi:10.1023/a:1026241906044

Cited by 24 publications

(6 citation statements)

References 15 publications

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“…Indeed, the increased application of radioisotopes has raised the need for a re-consideration of existing disposal options and has led to an examination of the possibility of recovering useful radionuclides from radioactive waste for re-use. In addition, stringent safety regulations demand the separation of long-lived radiotoxic, hazardous metal ions from radioactive wastes before their disposal and concentration into small volumes via a suitable technology (Kumar et al 2003).…”

Section: Introductionmentioning

confidence: 99%

Exchange Character of Caesium Ions onto Zirconium Tungstate

Sheha

El-Khouly

2011

Adsorption Science & Technology

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Amorphous zirconium tungstate, an inorganic ion-exchanger, was synthesized under optimum conditions and used as a cation-exchange material for the removal of caesium ions from radioactive waste solutions under simulated conditions using batch techniques. The physical and chemical properties of the synthesized ion-exchanger were characterized using Fouriertransform (FT) infrared, X-ray diffraction (XRD) and differential scanning calorimetric (DSC) techniques. Its chemical stability in various mineral acids, bases and organic solvents was also assessed. The data obtained reveal that the prepared exchanger had a good ionexchange capacity (1.34 mequiv/g towards Cs+ ions) and a high thermal and chemical stability. A hypothetical structural formula, Zr[WO2(OH)2]• 4H2O, was proposed on the basis of chemical composition, FT-IR and thermal analyses. The influences of pH, contact time, initial solute concentration and temperature are reported. Various parameters such as the effective diffusion coefficient under different conditions and the activation energy were determined from the graphical representation of the linearized form of the Arrhenius equation. Thermodynamic parameters such as ΔG0, ΔH0 and ΔS0 were also calculated. The numerical value of ΔG0 increased from 7.43 to 9.74 kJ/mol as the temperature was increased from 298 K to 313 K, indicating that the exchange reaction was more favourable at low temperatures. The negative value of ΔH0 (–49.55 kJ/mol) reflected the exothermic nature of the exchange process.

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Section: Introductionmentioning

confidence: 99%

Exchange Character of Caesium Ions onto Zirconium Tungstate

Sheha

El-Khouly

2011

Adsorption Science & Technology

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“…Inorganic sorbents for ion separations are applied in both industry and the public sector for sequestration of hazardous species, recovery of precious metals, and improvement of water quality and purity. Some specific applications include removal of radionuclides from nuclear wastes − and contaminated waste sites, , water softening, arsenic removal from domestic water supplies, − treatment of industrial wastewater, , and scavenging trace metals from catalytic reaction products (i.e., pharmaceuticals) . Natural and synthetic clays, , zeolites , and other nanoporous frameworks, − micro- , and mesoporous materials, and hydrous metal oxides , have all been shown to be effective in metal separation applications.…”

Section: Introductionmentioning

confidence: 99%

A Family of Peroxo-titanate Materials Tailored for Optimal Strontium and Actinide Sorption

Nyman

Hobbs

2006

Chem. Mater.

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Achieving global optimization of inorganic sorbent efficacy, as well as tailoring sorbent specificity for target sorbates would facilitate increased wide-spread use of these materials in applications such as producing potable water or nuclear waste treatment. Sodium titanates have long been known as sorbents for radionuclides;90 Sr and transuranic elements in particular. We have developed a related class of materials, which we refer to as peroxo-titanates: these are sodium titanates or hydrous titanates processing, storing and utilizing the peroxo-titanate as an aqueous slurry rather than a dry powder, and post-synthesis acidification. All three synthesis modifications; addition of hydrogen peroxide, use of a slurry form and acidification can be applied more broadly to the optimization of other metal oxide sorbents and other ion separations processes.

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“…[21] Typical inorganic adsorbents, such as zeolite, clay, carbon-based materials, titanate based materials and aqueous manganese dioxide. [22][23][24][25][26][27][28] In recent decades, another type of layered metal sulfides, for example, KTS-3, [29] KMS-1, [30] KMS-2, [31] and FJSM-SnS [32] layered ion exchangers have been studied deeply, which have good ionic exchange properties with certain ion exchange capacity. [33][34][35][36][37][38][39][40] Metal fluorides or fluoroaluminates is a type of materials in which aluminum atoms are coordinated to fluorine atoms as AlF 6 octahedra or AlF 4 tetrahedra.…”

Section: Introductionmentioning

confidence: 99%

First Potassium Fluoroaluminate Ionic Exchanger for Rapid and Selective Removal of Sr²⁺ with High Capacity

Hao,

Chen,

Cao

et al. 2024

Chemistry A European J

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90Sr, as a typical artificial radionuclide, poses a serious threat to human health and the ecological environment. The selective removal of this radionuclide from industrial nuclear waste is very necessary for our environment. Here we report a novel potassium fluoroaluminate, K2[(AlF5)H2O], which was synthesized by a simple low‐temperature one‐step method. It adopts a 1D AlF6‐chain structure, which consists of exchangeable potassium ions in between the infinite chains of octahedral Al centers. As a remarkable inorganic ionic exchanger, K2[(AlF5)H2O] has a high chemical stability (resistance of pH= ~3‐12) and thermal stability. It possesses an excellent adsorption selectivity (Kd=~6.1×104 mL·g−1) and a maximum adsorption capacity of qm= ~120.32 mg·g−1 for Sr2+. Importantly, it still keep a very good selectivity for Sr2+ ions even in the presence of competing Na+, Mg2+ and Ca2+ aqueous solutions. K2[(AlF5)H2O] is the first example of fluoroaluminate ionic exchange materials that can capture Sr2+. This result opens up a new way to design and synthesize inorganic ionic exchangers for the selective removal of Sr2+ ions from radioactive waste water.

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Untitled

Cited by 24 publications

References 15 publications

Exchange Character of Caesium Ions onto Zirconium Tungstate

Exchange Character of Caesium Ions onto Zirconium Tungstate

A Family of Peroxo-titanate Materials Tailored for Optimal Strontium and Actinide Sorption

First Potassium Fluoroaluminate Ionic Exchanger for Rapid and Selective Removal of Sr²⁺ with High Capacity

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Untitled

Cited by 24 publications

References 15 publications

Exchange Character of Caesium Ions onto Zirconium Tungstate

Exchange Character of Caesium Ions onto Zirconium Tungstate

A Family of Peroxo-titanate Materials Tailored for Optimal Strontium and Actinide Sorption

First Potassium Fluoroaluminate Ionic Exchanger for Rapid and Selective Removal of Sr2+ with High Capacity

Contact Info

Product

Resources

About

First Potassium Fluoroaluminate Ionic Exchanger for Rapid and Selective Removal of Sr²⁺ with High Capacity