Phillipsite in Cs Decontamination and Immobilization

Komarneni, Sridhar

doi:10.1346/ccmn.1985.0330209

Cited by 33 publications

(15 citation statements)

References 12 publications

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“…At 1000°C, in substantial agreement with previous research [20], the Cs-exchanged sample was mostly a well crystallized pollucite, CsAlSi 2 O 6 , belonging to the family of analcime (Fig. 2(b)), with a limited amount of amorphous phase.…”

Section: Neapolitan Yellow Tuffsupporting

confidence: 90%

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Safe trapping of Cs in heat-treated zeolite matrices

Bosch

Caputo

Liguori

et al. 2004

Journal of Nuclear Materials

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Section: Neapolitan Yellow Tuffsupporting

confidence: 90%

“…Clinoptilolite, among the natural zeolites, is the most frequently used in this type of procedure (see, e.g., [18,19]), but also phillipsite has been successfully tested [20]. The performance of other natural zeolites in this type of procedure would be of interest.…”

Section: Introductionmentioning

confidence: 99%

Safe trapping of Cs in heat-treated zeolite matrices

Bosch

Caputo

Liguori

et al. 2004

Journal of Nuclear Materials

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“…Komarneni, 1985;Mumpton, 1999;Kalló, 2001;Maxwell and Stork, 2001;Ming and Allen, 2001;Bish et al, 2003;Ackley et al, 2003, Colella, 2011. As a consequence, zeolites are an important bulk commodity: the world production of natural zeolites in 2012 was~2,800,000 tons and the consumption of synthetic zeolites was 1,900,000 tons (US Geological Survey, 2013).…”

Section: Introductionmentioning

confidence: 99%

Zeolites at high pressure: A review

2014

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This is a review of the elastic behaviour and pressure (P)-induced structural evolution of zeolites and presents a comparative analysis of the deformation mechanisms of the Si/Al-framework and the rearrangement of the extra-framework species in response to applied pressure. The interaction between P-transmitting fluids and zeolites, which can lead to phenomena such as 'P-induced over-hydration', is described. The comparative elastic analysis and the high-P structural data of zeolites reported so far allow us to make some generalizations: (1) The range of compressibility among this class of openframework silicates is large, with bulk moduli ranging between 15 and 70 GPa; (2) Microporosity does not necessarily imply high compressibility, as several zeolites are less compressible than other nonzeolitic rock-forming minerals; (3) Compressibilities of zeolites do not seem to be directly related to microporosity, at least if we model microporosity with the 'framework density'; (4) The flexibility observed in zeolites under hydrostatic compression is mainly governed by tilting of rigid tetrahedra around O atoms that behave as hinges within the framework. Pressure-induced tilting commonly leads to continuous rearrangement of the framework without any phase transition. More rarely, tilting induces displacive phase transitions and isothermal P-induced reconstructive phase transitions (i.e. with change in framework topology), have not been reported in this class of materials; (5) Deformation mechanisms in response to applied pressure are generally dictated by the topological configuration of the framework rather than the Si/Al-distribution or the extra-framework content. The channel content governs the compressibility of the cavities, leading to different unit-cell-volume compressibilities in isotypic structures.

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“…Unfortunately, pollucite is normally synthesized at about 1200°C in air19202122, or hydrothermally from certain specific zeolites. For example, chabazite transforms into pollucite at 240°C in 6 days23 and phillipsite changes into pollucite at 300°C in 13 hours24.…”

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confidence: 99%

Final storage of radioactive cesium by pollucite hydrothermal synthesis

Yokomori

Asazuki

Kamiya

et al. 2014

Sci Rep

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The Fukushima nuclear accident has highlighted the importance of finding a better final storage method for radioactive cesium species. Cs is highly soluble in water, and can easily exchange with other alkali ions in zeolites or clays to form stable complexes. However, Cs+ is released from Cs+ complexes into water when surrounded by an excess of water. Pollucite may be the best final storage option for Cs+, but its typical synthesis requires heating to about 1200°C in air. Here, we show that the hydrothermal synthesis of pollucite can be completed at 300°C in three hours from any zeolite or clay. Furthermore, our procedure does not require ion exchange before synthesis. Radioactive Cs is usually found in complexes with clays. At that time, this method only requires calcium hydroxide, water, and three hours of hydrothermal synthesis, so the process is both inexpensive and practical for large-scale application. Pollucite is an analog of analcime zeolite, and contains a channel system 2.8 Å in diameter, which is formed by 6-oxygen rings. As the diameter of Cs+ is 3.34 Å and each Cs+ exists independently within a separate portion of the channel, Cs+ cannot exit the pollucite framework without breaking it.

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Phillipsite in Cs Decontamination and Immobilization

Cited by 33 publications

References 12 publications

Safe trapping of Cs in heat-treated zeolite matrices

Safe trapping of Cs in heat-treated zeolite matrices

Zeolites at high pressure: A review

Final storage of radioactive cesium by pollucite hydrothermal synthesis

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