Relevant bibliographies by topics / Sitinakite

Academic literature on the topic 'Sitinakite'

Author: Grafiati
Published: 26 September 2023

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Journal articles on the topic "Sitinakite"

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Panikorovskii, Taras L., Galina O. Kalashnikova, Anatoly I. Nikolaev, Igor A. Perovskiy, Ayya V. Bazai, Victor N. Yakovenchuk, Vladimir N. Bocharov, Natalya A. Kabanova, and Sergey V. Krivovichev. "Ion-Exchange-Induced Transformation and Mechanism of Cooperative Crystal Chemical Adaptation in Sitinakite: Theoretical and Experimental Study." Minerals 12, no. 2 (February 15, 2022): 248. http://dx.doi.org/10.3390/min12020248.

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The microporous titanosilicate sitinakite, KNa2Ti4(SiO4)2O5(OH)·4H2O, was first discovered in the Khibiny alkaline massif. This material is also known as IONSIV IE-911 and is considered as one of the most effective sorbents for Cs+ and Sr2+ from water solutions. We investigate a mechanism of cooperative crystal chemical adaptation caused by the incorporation of La3+ ions into sitinakite structure by the combination of theoretical (geometrical–topological analysis, Voronoi migration map calculation, structural complexity calculation) and empirical methods (PXRD, SCXRD, Raman spectroscopy, scanning electron microscopy). The natural crystals of sitinakite (a = 7.8159(2), c = 12.0167(3) Å) were kept in a 1M solution of La(NO3)3 for 24 h. The ordering of La3+ cations in the channels of the ion-exchanged form La3+Ti4(SiO4)2O5(OH)·4H2O (a = 11.0339(10), b = 11.0598(8), c = 11.8430(7) Å), results in the symmetry breaking according to the group–subgroup relation P42/mcm → Cmmm.
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Milne, Nicholas A., Christopher S. Griffith, John V. Hanna, Maria Skyllas-Kazacos, and Vittorio Luca. "Lithium Intercalation into the Titanosilicate Sitinakite." Chemistry of Materials 18, no. 14 (July 2006): 3192–202. http://dx.doi.org/10.1021/cm0523337.

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Dyer, Alan, Jon Newton, Luke O’Brien, and Scott Owens. "Studies on a synthetic sitinakite-type silicotitanate cation exchanger." Microporous and Mesoporous Materials 117, no. 1-2 (January 2009): 304–8. http://dx.doi.org/10.1016/j.micromeso.2008.07.003.

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Luca, Vittorio, John V. Hanna, Mark E. Smith, Michael James, David R. G. Mitchell, and John R. Bartlett. "Nb-substitution and Cs+ ion-exchange in the titanosilicate sitinakite." Microporous and Mesoporous Materials 55, no. 1 (August 2002): 1–13. http://dx.doi.org/10.1016/s1387-1811(02)00353-0.

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Tripathi, Akhilesh, Dmitri G. Medvedev, May Nyman, and Abraham Clearfield. "Selectivity for Cs and Sr in Nb-substituted titanosilicate with sitinakite topology." Journal of Solid State Chemistry 175, no. 1 (October 2003): 72–83. http://dx.doi.org/10.1016/s0022-4596(03)00145-2.

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Thorogood, Gordon J., Brendan J. Kennedy, Christopher S. Griffith, Maragaret M. Elcombe, Maxim Avdeev, John V. Hanna, Samantha K. Thorogood, and Vittorio Luca. "Structure and Phase Transformations in the Titanosilicate, Sitinakite. The Importance of Water." Chemistry of Materials 22, no. 14 (July 27, 2010): 4222–31. http://dx.doi.org/10.1021/cm100727h.

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Perovskiy, Igor A., Elena V. Khramenkova, Evgeny A. Pidko, Pavel V. Krivoshapkin, Alexandr V. Vinogradov, and Elena F. Krivoshapkina. "Efficient extraction of multivalent cations from aqueous solutions into sitinakite-based sorbents." Chemical Engineering Journal 354 (December 2018): 727–39. http://dx.doi.org/10.1016/j.cej.2018.08.030.

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Medvedev, Dmitri G., Akhilesh Tripathi, Abraham Clearfield, Aaron J. Celestian, John B. Parise, and Jonathan Hanson. "Crystallization of Sodium Titanium Silicate with Sitinakite Topology: Evolution from the Sodium Nonatitanate Phase." Chemistry of Materials 16, no. 19 (September 2004): 3659–66. http://dx.doi.org/10.1021/cm049479a.

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Gainey, Seth R., Matheus T. Lauar, Christopher T. Adcock, Jacimaria R. Batista, Kenneth Czerwinski, and David W. Hatchett. "The influence of thermal processing on the sorption of Cs and Sr by sitinakite." Microporous and Mesoporous Materials 296 (April 2020): 109995. http://dx.doi.org/10.1016/j.micromeso.2019.109995.

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Celestian, A. J., M. Powers, and S. Rader. "In situ Raman spectroscopic study of transient polyhedral distortions during cesium ion exchange into sitinakite." American Mineralogist 98, no. 7 (July 1, 2013): 1153–61. http://dx.doi.org/10.2138/am.2013.4349.

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Dissertations / Theses on the topic "Sitinakite"

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Tratnjek, Toni. "Développement de silicotitanates à porosité hiérarchisée pour la capture du Strontium." Electronic Thesis or Diss., Montpellier, Ecole nationale supérieure de chimie, 2022. http://www.theses.fr/2022ENCM0022.

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L'idée générale de cette thèse repose sur l'utilisation de matière molle (tensioactifs, micelles, émulsions) pour texturer des matériaux à porosité hiérarchisée. Ces matériaux sont destinés à une utilisation en décontamination des effluents et leur texturation poreuse leur incombe des propriétés réactives augmentées ainsi que la possibilité d'être utilisés en mode continu. Cette méthodologie de texturation est connue et bien documentée pour des squelettes inorganiques en carbone ou en silice alors qu'à notre connaissance, il n'existe pas d'exemples dans la littérature concernant les silicotitanates ou les zéolithes, qui sont des sorbants connus des produits de fission visés. Le principe général de ces synthèses repose sur le mélange de deux émulsions huile-dans-eau (H/E) à haute teneur en phase interne. Lors du mélange des deux émulsions, le réseau inorganique commence à croître dans la phase aqueuse en entourant les gouttes d'huile. La maîtrise des paramètres tels que la température, le pH, ou la pression (autoclave pour une synthèse en milieu hydrothermal) qui régissent directement la réaction de polymérisation du réseau inorganique devrait conduire à l'obtention d'un monolithe. Il ne reste alors plus qu'à laver le matériau pour libérer la porosité du dit monolithe. Les émulsions seront caractérisées par microscopie optique pour évaluer la taille des gouttes d'huile, alors que les matériaux seront caractérisés par adsorption de gaz et SAXS pour connaître les propriétés du réseau de mésopores, par MEB pour évaluer la taille des macropores et par DRX pour évaluer la cristallinité du squelette
The general idea of this thesis is based on the use of soft material (surfactants, micelles, emulsions) to texture materials with hierarchical porosity. These materials are intended for use in decontamination of effluents and their porous texturing is due to increased reactive properties and the possibility of being used in continuous mode. This texturing methodology is known and well documented for inorganic carbon or silica skeletons whereas to our knowledge there are no examples in the literature concerning silicotitanates or zeolites, which are known sorbents of the intended fission products. The general principle of these syntheses is based on the mixing of two oil-in-water (H/E) emulsions with high internal phase content. When the two emulsions are mixed, the inorganic network begins to grow in the aqueous phase by surrounding the oil drops. Control of parameters such as temperature, pH, or pressure (autoclave for hydrothermal synthesis) which directly regulate the polymerization reaction of the inorganic network should lead to the production of a monolith. All that remains then is to wash the material to release the porosity of the monolith. The emulsions will be characterized by optical microscopy to evaluate the size of the oil drops, while the materials will be characterized by gas adsorption and SAXS to know the properties of the mesopores network, by SEM to assess macropore size and by XRD to assess skeletal crystallinity
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Milcent, Théo. "Mise en place d'une nouvelle méthodologie d'évaluation d'un échangeur d'ions minéral du point de vue de sa sélectivité : Cas particulier de l'optimisation structurale et microstructurale d'un silicotitanate cristallin (CST), appliqué à la décontamination d'effluents simultanément contaminés en Sr2+ et Cs+." Electronic Thesis or Diss., Montpellier, Ecole nationale supérieure de chimie, 2022. http://www.theses.fr/2022ENCM0010.

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Les alumino, titano et zircono-silicates zéolithiques sont des matériaux présentant des propriétés intéressantes pour de nombreuses applications dans la pétrochimie, l'agriculture, le médical, le stockage d'énergie ainsi que la décontamination d'effluents. Dans le domaine du traitement des effluents radioactifs, leurs propriété d'échange d'ions font de ces matériaux des extractants de radionucléides efficaces avec de bonnes sélectivités (e.g. césium ou strontium). Leurs compositions (le ratio Al/Si, Ti/Si, Zr/Si… ; la nature et la charge des métaux ; la nature, la charge, la concentration et la taille de l'ion échangeable) ainsi que la structure cristalline (amorphe, 2D lamellaire, 3D cage ou tunnel) vont avoir des effets sur les mécanismes d'échange ionique (cinétique, spécificité, stabilité). Ces paramètres vont aussi influencer la capacité de sorption ainsi que la sélectivité que le matériau a pour un ion. Lors de cette thèse, les relations structure/propriété de différents silicates seront étudiées dans le but d'appréhender les mécanismes de sorption. A cette fin, les synthèses de plusieurs silicates seront menées et optimisées. Par la suite, différentes techniques de caractérisation seront misent en place afin d'analyser les propriétés structurales, morphologiques et la composition des silicates. Enfin, ces matériaux seront mis en œuvre pour le traitement d'effluents modèles et d'effluents réels simulés, afin d'évaluer leurs performances et les mettre en lien avec leurs caractéristiques structurales et texturales
Alumino, titano and zircono-silicates zeolitic materials exhibit good performances in applications such as catalysis, gas separation and confinement. In addition, these kind of materials has been successfully used in different fields like petrochemistry, agriculture, medical, energy storage and nuclear decontamination. Their ion exchange properties make them very selective for radionuclides extraction (e.g. cesium or strontium) from wastewater treatment. Their composition (Al/Si, Ti/Si, Zr/Si ratio; “metal” nature and charge; labile ion nature, charge, size and concentration) and their framework structure (amorphous, 3D cage or tunnel) affect the ion exchange mechanism (i.e. kinetics, specificity, stability). These parameters may also modify the sorption capacity and the ion selectivity. In the present PhD, the relationship between structure and properties of several silicates will be studied in order to better understand their sorption mechanisms. To this end, the synthesis of different silicates will be performed and optimized. Then, their structures, morphologies and compositions will be analyzed by the application of different characterization techniques. Finally, this materials will be implemented to effluent treatments (i.e. model effluent and simulate real effluent) to evaluate their performances and find the connection between the structural and textural properties
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Book chapters on the topic "Sitinakite"

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Perovskiy, Igor A. "The Effect of Sitinakite Crystallinity Degree and Textural Characteristics on Its Sorption Properties." In Springer Proceedings in Earth and Environmental Sciences, 175–81. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-00925-0_27.

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