Uptake of radionuclides on microporous and layered ion exchange materials

Al-Attar, Lina; Dyer, A.; Harjula, Risto

doi:10.1039/b308200h

Cited by 64 publications

(37 citation statements)

References 28 publications

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“…The other forms (M-H-birnessite) did first undergo an acid treatment, in which sodium ions located between the octahedral (MnO 6 ) 8À layers were extracted, forming H-birnessite; followed by exchanging with cations of interest. In the same manner described in literature (10), four exchange forms of antimonysilicate, symbolized as M-SbSi, where M ¼ H þ , K þ , Na þ , or Ca 2þ , were also generated using the as-supplied material (As-SbSi).…”

Section: Ion Exchange Materials and Their Derivativesmentioning

confidence: 99%

“…Previous work by the author illustrates the superior uptake behavior of birnessite for uranium (15) and other radioisotopes present in radioactive waste effluents (10,11) in comparison to titanosilicates (16,17) and antimonysilicate (18). The research, herein, describes the sorption efficiency of birnessite and antimonysilicate materials and their M-derivatives (where M ¼ H, Na, K, and Ca) to take up 234 Th in four different media, representing chemical conditions in waste streams.…”

Section: Introductionmentioning

confidence: 95%

“…In acidic solution aluminum is preferentially leached from the zeolite framework and similarly silicon in alkaline solutions. In this concept, an antimonysilicate material has recently become of commercial interest since it has been investigated to take up efficiently a number of radioisotopes (9)(10)(11). Birnessite mineral is the most stable layered manganese oxide which was first reported in the Birness region of Scotland by Jones and Milne (in 1956).…”

Section: Introductionmentioning

confidence: 99%

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Thorium Uptake on Synthetic Inorganic Ion Exchangers

Al-Attar

Budeir

2011

Separation Science and Technology

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Birnessite, antimonysilicate, and their cation-exchange derivatives were tested to take up thorium. Sorption experiments were performed in different concentrations of acid, sodium, potassium, and calcium nitrate solutions in order to evaluate the influence of cations that are likely to be present in waste effluents. Variation in the magnitude and mechanism of thorium sorption on the exchangers was ascribed to structural differences and the exchange properties of the materials, as well as the aqueous chemistry of thorium. The work included investigation of thorium solution' pH in controlling the sorption process. In acidic solutions, H-antimonysilicate proved to be the best sorbent. The structure of M-H-birnessite allows facile mobility of the interlayer cations with little structural rearrangement, making it of great importance for ion-exchange use in salt conditions. Potassium had the most, and sodium the least effect on thorium selectivity by birnessites, when they are present as macro components. Conversely, calcium ions did greatly inhibit the sorption behavior of thorium on Ca-antimonysilicate. Studying the effect of thorium solution' pH reflected the fact that the microcrystal modifications of birnessites occurred during experiments. In summary, H-birnessite showed superior uptake for thorium in comparison to other materials investigated in the literature, which reflects the characteristics of the material selectivity.

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Section: Ion Exchange Materials and Their Derivativesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

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Thorium Uptake on Synthetic Inorganic Ion Exchangers

Al-Attar

Budeir

2011

Separation Science and Technology

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“…Layered hydrated silicates were also used as reactants in the synthesis of zeolites by recrystallization processes, as in the transformation of kanemite into beta zeolite with various aluminum concentrations [17]. On the other hand, titanosilicate layered materials such as JDF-L1 and AM-4 have good performance for actinide removal in salt solutions [18] and for catalytic oxidation [19].…”

Section: Introductionmentioning

confidence: 99%

Structural incorporation of titanium and/or aluminum in layered silicate magadiite through direct syntheses

Pires¹,

Oliveira²,

Airoldi³

2012

Materials Chemistry and Physics

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“…Previous work by these authors illustrated the supe-rior uptake behaviour of this material for uranium (AlAttar and Dyer 2002) and other radioisotopes present in radioactive waste effluents (Dyer et al 2000a,b;AlAttar et al 2003a,b) when it was compared to titanosilicates (Al-Attar et al 2000, 2003bAl-Attar and Dyer 2001) and antimony silicate (Al-Attar et al 2004). The work here describes the construction of cation exchange isotherms for birnessite, using 22 Na-labelled birnessite in contact with selected cation solutions.…”

Section: Introductionmentioning

confidence: 99%