Relevant bibliographies by topics / Strontium Adsorption

Academic literature on the topic 'Strontium Adsorption'

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Published: 6 September 2023

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Journal articles on the topic "Strontium Adsorption"

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Yakout, Sobhy M., Mohamed R. Hassan, and Mohamed I. Aly. "Synthesis of magnetic alginate beads based on magnesium ferrite (MgFe2O4) nanoparticles for removal of Sr (II) from aqueous solution: kinetic, equilibrium and thermodynamic studies." Water Science and Technology 77, no. 11 (May 17, 2018): 2714–22. http://dx.doi.org/10.2166/wst.2018.228.

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Abstract Novel magnetic alginate beads (MagAlgbeads) have been developed by incorporation of magnesium ferrite (MgFe2O4) in alginate beads with the aim of using them in the removal of strontium from aqueous solution. MagAlgbeads were characterized by transmission electron microscopy, scanning electron microscopy, X-ray fluorescence and Fourier transform infrared spectroscopy. The adsorption of strontium onto MagAlgbeads were found to depend on pH and strontium removal increases with increasing pH until pH is 6. Strontium adsorption kinetics run through pseudo-second-order model. Thermodynamically, strontium adsorption was endothermic and spontaneous. Langmuir isotherm gave good fitting for strontium removal with adsorption capacity of 505.5 mg/g. These results proved that the prepared MagAlgbeads are very efficient material for strontium adsorption.
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Qadeer, Riaz, Javed Hanif, Muhammad Saleem, and Muhammad Afzal. "Selective Adsorption of Strontium on Activated Charcoal from Electrolytic Aqueous Solutions." Collection of Czechoslovak Chemical Communications 57, no. 10 (1992): 2065–72. http://dx.doi.org/10.1135/cccc19922065.

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The adsorption of strontium on activated charcoal has been studied as a function of shaking time, pH, concentration of adsorbate and temperature. Wavelength dispersive X-ray fluorescence spectrometer was used for measuring strontium concentration. The adsorption of strontium obeys Freundlich and Langmuir isotherms. Quantities ∆H0 and ∆S0 were calculated from the slope and intercept of plot ln KD vs 1/T. The influence of different cations and anions on strontium adsorption has been examined. The adsorption of other metal ions on activated charcoal has been studied under specific conditions to check its selectivity. Consequently, strontium was removed from Rh, Pr, Rb and Cs. More than 95% adsorbed strontium on activated charcoal can be recovered with 65 ml 3M HNO3 solution.
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Kylivnik, Yu M., V. V. Tryshyn, M. V. Strilchuk, O. V. Gaidar, H. V. Vasylyeva, S. I. Vuchkan, O. Ya Sych, and I. Yu Syika. "The titanium silicate influence on the Zn(II) and Sr(II) migration in the aquatic environment." Nuclear Physics and Atomic Energy 21, no. 3 (September 25, 2020): 249–55. http://dx.doi.org/10.15407/jnpae2020.03.249.

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The aim of the present work is titanium silicate influence on the zinc and strontium migration in the aquatic environment. The adsorption capacity of titanium silicate toward zinc and strontium ions was investigated. With the aid of a fluorescent X-ray analyzer and energy dispersive spectroscopy the composition of the sorbent formed was determined as well as zinc and strontium presence on the surface of the sorbent after the sorption process. It was shown, that adsorption of zinc and strontium by titanium silicate strongly depends on time of interaction and solution acidity and increases with increasing of both parameters. It was established, that for the initial concentration of zinc and strontium at the level of 0.005M the presence of ions that cause the natural mineralization of water does not affect their adsorption extraction.
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Zhou, Han, Xue Gang Luo, and Xiao Yan Lin. "Adsorption of Strontium from Aqueous Solution Using Collagen Fiber Immobilized Tannins." Advanced Materials Research 726-731 (August 2013): 2107–10. http://dx.doi.org/10.4028/www.scientific.net/amr.726-731.2107.

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The removal of strontium from aqueous solution with collagen fiber immobilized tannins was studied. The effects of several experimental parameters such as pH, dosage, temperature, contact time and initial concentration of strontium on removal efficiency of strontium were investigated to determine the optimum conditions of strontium sorption process. The adsorbent was characterized by SEM and FTIR analysis. The results of regression analysis indicated that temperature parameters were not individually statistically significant for Sr2+ adsorption. However, the efficiency of strontium adsorption increased with the increase in pH and dosage. The adsorption capacity was increased with increasing initial concentration of Sr2+. The removal efficiency of Sr2+ was 49% at optimum pH of 6 and initial concentration of 20mg/L. Moreover, the absorption data were fitted well to the Langmuir sorption isotherm model.
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Chen, Yuliang, Xiangbiao Yin, Hao Fu, Zheyang Lin, Guangcan Ma, Xinpeng Wang, Qingsong Wang, and Fangqiang Chen. "Preparation of Porous Composite Phase Na Super Ionic Conductor Adsorbent by In Situ Process for Ultrafast and Efficient Strontium Adsorption from Wastewater." Metals 13, no. 4 (March 29, 2023): 677. http://dx.doi.org/10.3390/met13040677.

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Strontium, the main component of radioactive nuclear wastewater, is characterized by a high fission yield and an extended half-life. It is easily absorbed by the human body, thus greatly threatening the environment and the human body. In this study, a mesoporous composite phase sodium superionic conductor (NVP@NMP) was synthesized by the droplet template method, and the rapid capture of Sr2+ from wastewater was achieved by constructing a nano-heterogeneous interface to increase the ion diffusion rate. NVP@NMP showed efficient and rapid removal of strontium ions in adsorption kinetics, isothermal adsorption, solution pH, and interfering ions concentration tests. Especially the equilibrium time of 2 min for strontium absorption by NVP@NMP and a maximum theoretical adsorption capacity of 361.36 mg/g. The adsorption process was spontaneous, endothermic, and feasible. At higher concentrations of other competing ions (Na, K, Ca, Mg, and Cs), the adsorbent exhibited higher selectivity towards Sr2+.TEM, XPS, and XRD analyses revealed that ion exchange was the main mechanism for the NVP@NMP ultrafast adsorption of Sr2+. In this research, we investigated the feasibility of ultrafast strontium capture by sodium superionic conductor structured phosphates and explained the ultrafast strontium adsorption mechanism of NASICON materials through XPS.
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Fan, Shengnan, Lu Jiang, Zhiqian Jia, Yu Yang, and Li’an Hou. "Comparison of Adsorbents for Cesium and Strontium in Different Solutions." Separations 10, no. 4 (April 19, 2023): 266. http://dx.doi.org/10.3390/separations10040266.

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Adsorption is an effective method to remove cesium and strontium from a solution. Although a variety of adsorbents has been reported, it is difficult to compare their adsorption properties due to different experimental conditions (such as solution concentration, volume, composition, temperature, etc.). In this paper, a series of adsorbents for the adsorption of cesium and strontium (ammonium phosphomolybdate, Prussian blue, sabite, clinoptilolite, titanium silicate) were synthesized and characterized using XRD, IR and SEM, and their adsorption performance in mixed solution (containing Li, Na, K, Cs, Ca, Sr and Mg ions, 1 mmol L−1), artificial seawater and salt lake brine were studied under the same conditions; in addition, the adsorption mechanism was elucidated. The results showed that ammonium phosphomolybdate has the largest adsorption capacity for cesium in the mixed solution. In artificial seawater and salt lake brine, Prussian blue displays the highest cesium adsorption capacity and the best selectivity. The multi-adsorption mechanisms are beneficial to the selective adsorption of Prussian blue in complex solutions. These results are useful for choosing adsorbents for cesium and strontium in applications.
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KUMAR, RAJESH, and S. K. JAIN. "REMOVAL OF STRONTIUM (II) FROM AQUEOUS SOLUTION USING FUNCTIONALIZED CARBON NANOTUBES." International Journal of Nanoscience 11, no. 02 (April 2012): 1250019. http://dx.doi.org/10.1142/s0219581x12500196.

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This study was carried out to evaluate the environmental application of functionalized carbon nanotubes through the experimental removal of strontium (II) from water. The aim was to find the optimal condition for the removal of strontium from water under different conditions such as initial concentration of strontium, contact time and neutral pH. The functionalized multi wall carbon nanotubes (f-MWCNT) were characterized by FT-IR and scanning electron microscopy (SEM). The adsorption isotherms were correlated to Freundlich and Langmuir models and it was found that the adsorption data could be fitted better by Langmuir model than Freundlich one. The kinetic data shows that the adsorption describes well with the pseudo-second order kinetic model. Functionalized MWCNT can be used as good adsorbent for the removal of the strontium ions from polluted water according to results.
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Prajitno, Muhammad Yusuf, Mohamad Taufiqurrakhman, David Harbottle, and Timothy N. Hunter. "Kinetic Studies of Cs+ and Sr2+ Ion Exchange Using Clinoptilolite in Static Columns and an Agitated Tubular Reactor (ATR)." ChemEngineering 5, no. 1 (February 11, 2021): 9. http://dx.doi.org/10.3390/chemengineering5010009.

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Natural clinoptilolite was studied to assess its performance in removing caesium and strontium ions, using both static columns and an agitated tube reactor (ATR) for process intensification. Kinetic breakthrough curves were fitted using the Thomas and Modified Dose Response (MDR) models. In the static columns, the clinoptilolite adsorption capacity (qe) for 200 ppm ion concentrations was found to be ~171 and 16 mg/g for caesium and strontium, respectively, highlighting the poor material ability to exchange strontium. Reducing the concentration of strontium to 100 ppm, however, led to a higher strontium qe of ~48 mg/g (close to the maximum adsorption capacity). Conversely, halving the column residence time to 15 min decreased the qe for 100 ppm strontium solutions to 13–14 mg/g. All the kinetic breakthrough data correlated well with the maximum adsorption capacities found in previous batch studies, where, in particular, the influence of concentration on the slow uptake kinetics of strontium was evidenced. For the ATR studies, two column lengths were investigated (of 25 and 34 cm) with the clinoptilolite embedded directly into the agitator bar. The 34 cm-length system significantly outperformed the static vertical columns, where the adsorption capacity and breakthrough time were enhanced by ~30%, which was assumed to be due to the heightened kinetics from shear mixing. Critically, the increase in performance was achieved with a relative process flow rate over twice that of the static columns.
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Ren, Lin, Xudong Zhao, Baosheng Liu, and Hongliang Huang. "Synergistic effect of carboxyl and sulfate groups for effective removal of radioactive strontium ion in a Zr-metal-organic framework." Water Science and Technology 83, no. 8 (March 19, 2021): 2001–11. http://dx.doi.org/10.2166/wst.2021.103.

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Abstract Rapid removal of radioactive strontium from nuclear wastewater is of great significance for environmental safety and human health. This work reports the effective adsorption of strontium ion in a stable dual-group metal-organic framework, Zr6(OH)14(BDC-(COOH)2)4(SO4)0.75 (Zr-BDC-COOH-SO4), which contains strontium-chelating groups (-COOH and SO4) and a strongly ionizable group (-COOH). Zr-BDC-COOH-SO4 exhibits very rapid adsorption kinetics (<5 min) and a maximum adsorption capacity of 67.5 mg g−1. The adsorption behaviors can be well fitted to the pseudo-second-order model and the Langmuir isotherm model. Further investigations indicate that the adsorption of Sr2+ onto Zr-BDC-COOH-SO4 would not be obviously affected by solution pH and adsorption temperature. The feasible regeneration of the adsorbent was also demonstrated using a simple elution method. Mechanism investigation suggests that free -COOH contributes to the rapid adsorption based on electrostatic interaction, while the introduction of -SO4 significantly enhanced the adsorption capacity. Thus, these results suggest that Zr-BDC-COOH-SO4 is a potential candidate for Sr2+ removal. They also introduce dual groups as an effective strategy for designing high-efficiency adsorbents.
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Li, Yungui, Xiang Luo, Xueying Bai, Wenxuan Lv, and Yang Liao. "Adsorption of Strontium onto Adaxial and Abaxial Cuticle of Photinia serrulata Leaf." International Journal of Environmental Research and Public Health 17, no. 3 (February 7, 2020): 1061. http://dx.doi.org/10.3390/ijerph17031061.

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Leaf cuticle sorption is one important process for the uptake of environment pollutants in plants, and mixed powder including adaxial and abaxial cuticle is generally used to demonstrate the sorption behavior. However, the difference of adaxial and abaxial cuticle on plant cuticle sorption is not well understood. Abaxial cuticle (PAC) and adaxial cuticle (PBC) were isolated from hypostomatic Photinia serrulata to investigate their adsorption of a model radionuclide (strontium). The elemental composition and FTIR spectra for two cuticles were quite similar and both show high affinity (H/C, 1.59 and 1.65) and polarity ((O + N)/C, 0.470 and 0.499). Both adsorption isotherms fit well with Langmuir model (R2, 0.97 and 0.97), and the maximum adsorption capacity of PAC was 12.1 mg/g, little higher than that of PBC (10.3 mg/g). Adsorption of strontium increased with the increase of pH, and the maximum was attained when pH ≥4. Electrostatic attraction was demonstrated to be the main mechanism of -strontium adsorption onto PAC and PBC, and the similar adsorption of adaxial and abaxial cuticle was consistent with their similar isoelectric point.
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Dissertations / Theses on the topic "Strontium Adsorption"

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Fournier, Patricia. "Influence des acides organiques et des argiles sur la mobilité du plomb et du strontium dans les milieux naturels." Toulouse 3, 2003. http://www.theses.fr/2003TOU30073.

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Alby, Delhia. "Matériaux innovants pour la rétention sélective de césium et de strontium à partir de solutions aqueuses multi-composants : synthèse, optimisation et évaluation des performances." Thesis, Montpellier, 2017. http://www.theses.fr/2017MONTT168.

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Ce travail porte sur la synthèse et la caractérisation de nouveaux matériaux afin de proposer une alternative dans le cadre de la dépollution nucléaire. Dans une première partie bibliographique, les principaux matériaux inorganiques utilisés pour ce procédé sont décrits en précisant leurs capacités de sorption. Les matériaux lamellaires apparaissent comme possédant un fort potentiel pour cette application. Deux solides ont retenu notre attention : les nanostructures à base de vanadates et de manganates.Des synthèses solvothermales sous flux micro-ondes de ces composés sont ensuite développées, afin d’obtenir une structuration sous forme de nanotubes de vanadates et de nanofleurs de manganates. Une optimisation des vanadates a ainsi été menée en évaluant l’impact de différents facteurs (par exemple, temps de maturation, temps de chauffage, nature et quantité de templates) sur les propriétés structurales et texturales des produits synthétisés. L’enroulement des feuillets est fortement influencé à la fois par la quantité d’amine et sa structure chimique. En effet, seules les amines à longue chaîne conduisent à l’obtention de nanotubes de façon homogène. Une analyse structurale a également été menée pour les deux types de composés en couplant les données expérimentales et celles obtenues par simulation.Les performances de sorption et la sélectivité des matériaux dans différents milieux (eau ultra-pure, eau de rivière) ont été évaluées vis-à-vis du césium et du strontium, seuls ou en mélange. Les résultats montrent clairement une sélectivité très forte des vanadates vis-à-vis du Cs+ et des manganates pour le Sr2+, même en milieu compétitif.La calorimétrie et la simulation moléculaire ont finalement été couplées pour mieux décrire les processus de sélectivité
This work focuses on the synthesis and characterization of new nanostructured materials that can be potentially proposed as alternatives in the field of nuclear decontamination. The first part is devoted to the state of the art on the use of inorganic materials for decontamination purposes, with the emphasis placed on their sorption capacity and selectivity. The layer materials are considered as offering potential for such applications. In consequence, the main efforts in this work have been focused on manganate and vanadate nanostructures.Solvothermal synthesis of these materials was developed on the basis of micro-wave oven procedures to control the materials structuring, thus leading to vanadate nanotubes and manganate nanoflowers. The optimization of vanadates was carried out by taking into account the effect of various factors (e.g., duration of maturation and heating stages, nature and mass of the template) on both the structural and textural properties of the resulting substrates. It was demonstrated that the scrolling of the layers was strongly influenced by the amount of amine and its chemical structure. Indeed, only the amine templates possessing long chains allowed homogeneous nanotubes to be achieved. More information about the structuring process was inferred when coupling experimental and simulation approaches.The sorption performance of the resulting solid materials in terms of sorption capacity and selectivity was assessed in model and simulated systems obtained by using either ultrapure or river water with an adequate composition as solvent to prepare aqueous solutions of strontium or/and cesium. The results of sorption experiments clearly indicated strong selectivity of the vanadate structures toward Cs+ and that of the manganate ones toward Sr2+, even under conditions of competition among various ionic species.Direct calorimetry measurements of heat effects accompanying sorption were correlated with the results of molecular simulation studies to shed more light on the origin of the improved sorption selectivity
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Villard, Arnaud. "Mélange d'électrolytes en solution : de la modélisation à l'application pour la décontamination du strontium par le nonatitanate de sodium." Thesis, Montpellier, 2015. http://www.theses.fr/2015MONTS133/document.

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L'objectif de cette thèse est d'étudier la décontamination en ions de solutions aqueuses par les oxydes échangeurs d'ions en s'intéressant plus particulièrement à l'adsorption du strontium par le nonatitanate de sodium. Le but est de développer un modèle prédictif qui tienne compte des phénomènes physico-chimiques mis en jeu et des écarts à l'idéalité dans la solution, mais également dans le matériau. Pour cela, le calcul des coefficients d'activité des ions en solution a été calculé à partir d'une approche basée sur la théorie MSA (Mean Spherical Approximation) où les phénomènes spécifiques d'association ont été pris en compte. Cela a permis de calculer les coefficients d'activité des ions dans les mélanges ternaires. La validité des lois de mélange de Zdanovskii-Stokes-Robinson et McKay-Perring a également été précisée. Deux modèles d'activité, représentant les interactions à longues distances et à courtes distances, ont été utilisés pour l'étude des ions dans le solide. Les isothermes d'adsorption à différentes concentrations ont alors été modélisées. Une étude pH-métrique a également été conduite sur le nonatitanate de sodium afin de déterminer la constante d'hydrolyse ainsi que le taux d'hydrolyse du solide. Une étude structurale et morphologique a permis de mettre en évidence qu'avec des solutions très acides le nonatitanate de sodium se dissout et précipite de nouveau sous différentes formes cristallographiques du TiO2
The objective of this thesis is to study the ionics decontamination of aqueous solutions by ionic oxide exchangers with a particular focus on the strontium adsorption by the sodium nonatitanate. The goal is to develop a predictive model takes into account the phenomena involved, and the deviations to the ideality into the solution but also in the material.The activity coefficients of the ions in solution have been calculated from an approach based on the MSA theory (Mean Spherical Approximation), where the specific association phenomenons have been taken into account. This allowed for calculating the ionic activity coefficients in the ternary mixtures. The validity of mixture laws of Zdanovskii-Stokes-Robinson and McKay-Perring has been also specified. Two activity models, which represent the long and the short-range interactions, have been used for the ionic studied in the solid. The adsorption isotherms at various concentrations have been hence modeled.A pH-metric study has also been performed on the sodium nonatitanate in order to determine the hydrolysis constant as well as the solid hydrolysis rate. A structural and morphologic study allowed for highlighting that for highly acidic solutions the sodium nonatitanate is dissolved and precipitated again under different crystallographic forms of the TiO2
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Guhl, Hannes. "Density functional theory study of oxygen and water adsorption on SrTiO 3 (001)." Doctoral thesis, Humboldt-Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät I, 2011. http://dx.doi.org/10.18452/16276.

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Strontiumtitanat ist ein häufig untersuchtes Oxidmaterial, mit einem breiten Anwen- dungsgebiet z.B. in der Photokatalyse oder auch als Substratmaterial beim Wachstum ande- rer Oxidschichten. Dabei spielen chemische Prozesse an der Oberfläche eine herausragende Rolle, deren Kenntnis für eine tieferes Verständnis der genannten Anwendungen unentbehrlich ist. Darüberhinaus gibt es deutliche Hinweise darauf, dass diese Oberflächenprozesse sehr stark, u.a. von Wasserstoff und Wasser beeinflußt werden. Sowohl wegen der Relevanz als auch wegen der technischen Machbarkeit, stellt eine Untersuchung des Adsorptionsverhaltens von Sauerstoff und Wasserstoff mit Hilfe der Dichtefunktionaltheorie einen natürlichen Ausgangspunkt dar, um genaue Einblicke in die Prozesse auf der Oberfläche auf atomare Ebene zu gewinnen. Bei der Adsorption des Sauerstoffs und des Wassers ist gleichermaßen auffällig, dass die Bindungsenergien sehr stark durch langreichweitige Verzerrungen im Substratgitter beeinflußt werden, welche damit eine effektive repulsive Wechselwirkung der adsorbierten Spezies bewirken. Adsorbierte Sauerstoffatome bilden mit jeweils einem Sauerstoffatom des Subtrats ein „Quasi-Peroxid-anion“, wodurch das adsorbierte Sauerstoffatom einen Gitterplatz einnimmt, der nicht einem Sauerstoffplatz des Perovskitgitters entspricht. Im Gegensatz dazu wurden bei allen untersuchten atomaren Konfigurationen, die Wasser und Hydroxylgruppen enthielten, beobachtet, dass sich hier die adsorbierten Sauerstoffatome an den Plätzen des forgesetzten Perovskitgitters befinden. Bemerkenswert ist die spontane Dissoziation und Bildung eines Hydroxylpaares auf der Strontiumoxidterminierung während des Adsorption des Wassermoleküls. Auf der Titandioxidterminierung hingegen werden abhängig von der Bedeckung Wassermoleküle und Hydroxylgruppen beobachtet. Die Energetik, die diesem Verhalten zugrunde liegt, zeigt sehr gute Übereinstimmung mit den experimen- tellen Beobachtungen von Iwahori und Kollegen.
Strontium titanate is an extensively studied material with a wide range of application, for instance in photo-catalysis and most importantly, it is used as a substrate in growth of functional oxides. The surface chemistry is crucial and hence understanding the surface structure on atomic scale is essential for gaining insight into the fundamental processes in the aforementioned applications. Moreover, there exist a lot of evidence that this surface chemistry might be controlled to considerably by extrinsic species, such as residual hydrogen and water. Investigating the properties of water and oxygen on the strontium titanate surface is certainly a natural starting point for a theoretical study based on density functional theory, because these species are practically present on the surface on a wide range of experimental conditions and they are computationally feasible. For the oxygen and water adsorption the binding energy is controlled by long-range surface relaxations leading to an effective repulsion of the adsorbed specimen. The isolated oxygen ad-atom forms a covalently bonded “quasi-peroxide anion” in combination with a lattice oxygen atom. Contrariwise, in all investigated configurations containing water molecules and hydroxyl groups, the respective oxygen atoms assumed positions close to the oxygen sites of the continued perovskite lattice of the substrate. Most remarkably, on the strontium oxide termination, the water molecules adsorbs and dissociates effortlessly leading to the formation of a pair of hydroxyl groups. For the titanium dioxide termination, a coverage dependent adsorption mode is observed. Densely packings stabilize water molecules, whereas at lower coverage and finite temperatures the formation of hydroxyl groups is found. The energetics responsible for this behavior is consistent with recent experiments by Iwahori and coworkers.
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Limousin, Guillaume. "Transfert de solutés réactifs dans la zone non-saturée des sols à différentes échelles d'observation." Phd thesis, Université Joseph Fourier (Grenoble), 2006. http://tel.archives-ouvertes.fr/tel-00128889.

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Le transfert des contaminants dans la zone non-saturée des sols est gouverné par de nombreux mécanismes. Parfois, les études de terrain sont difficiles à mettre en œuvre, et il se pose la question de la transposabilité des résultats de laboratoire vers une situation de terrain.
Le site de la centrale nucléaire de Brennilis (Finistère) a été choisi pour étudier le transfert du strontium, du cobalt et de traceurs inertes dans le sol. Plusieurs échelles d'observation ont été testées (tube à essai, réacteur agité à flux ouvert, colonne de sol tamisé, lysimètre de sol remanié ou non, mesures de terrain) afin de déterminer, à chaque échelle, les principaux facteurs d'influence du transfert des contaminants, puis de vérifier l'adéquation des différentes échelles d'observation entre elles et leur représentativité par rapport au terrain.
Concernant les propriétés hydrodynamiques du sol, la porosité, la teneur en eau sur le terrain, la vitesse porale aux teneurs en eau du terrain, la conductivité hydraulique à saturation et le coefficient de dispersion de ce sol remblayé sont spatialement moins hétérogènes que dans les sols agricoles ou non-anthropisés. Les résultats obtenus en lysimètre et sur le terrain suggèrent que l'hydrodynamique de ce sol non-structuré peut être étudiée sur un prélèvement remanié si le volume de sol est grand par rapport aux rares cailloux de grande taille.
Concernant les interactions chimiques sol-contaminants, les isothermes du cobalt et du strontium sont non-linéaires au-delà de 10-4 mol.L-1. L'adsorption et la désorption du cobalt sont rapides et indépendantes du pH. Au contraire, en deça de 3,5.10-6 mol.L-1, les isothermes du cobalt et du strontium sont linéaires, la désorption du cobalt est nettement plus lente que l'adsorption et le coefficient de partage ainsi que les cinétiques sont nettement dépendants du pH. Pour les deux éléments, les résultats obtenus en tube à essai, en réacteur agité à flux ouvert et en colonne de sol tamisé sont concordants. Par contre, l'adsorption du strontium en tube à essai à l'équilibre n'explique pas totalement les résultats du traçage sur le terrain.
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Brazier, Jean-Michel. "Rôle des phases minérales des sols en tant que réservoirs de nutriments : approche expérimentale (abiotique), en milieu naturel et multi-isotopique (isotopes stables Ca-Sr)." Thesis, Strasbourg, 2018. http://www.theses.fr/2018STRAH005/document.

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Ce travail de thèse a appréhendé les mécanismes de stockage/libération, d’un point de vue élémentaire et isotopique, du calcium (Ca) et du strontium (Sr) sur ou dans des phases minérales communes des sols (minéraux primaires, minéraux argileux, oxy-hydroxydes, carbonate pédogénétiques). Une méthode de mesure robuste du δ88Sr a dû être développée et validée par la mesure de matériaux de références internationaux, pour la plupart jamais mesuré dans la littérature. Les résultats montrent que l’adsorption du Ca sur des minéraux phyllosilicatés génère un fractionnement isotopique par prélèvement préférentiel de l’isotope léger (40Ca) dans nos conditions expérimentales lorsque les minéraux possèdent une charge structurale et une surface spécifique importante et/ou un espace interfoliaire ouvert à l’adsorption de cations hydratés. Une étude sur des rhizolithes en milieu naturel a mis en avant que l’utilisation des isotopes du Ca et du Sr permet un traçage de source et de mécanismes efficaces dans les thématiques touchant au stockage de ces deux éléments dans les sols
This PhD thesis examined the mechanisms of storage and release, from and elementary and isotopically point of view, of calcium (Ca) and strontium (Sr) onto or into mineral phases commonly encountered within soils (primary minerals, clay minerals, oxy-hydroxides, pedogenic carbonate). A robust δ88Sr measurements method had to be developed in the laboratory and validated by the measurement of international reference materials, mostly never measured in the literature. The results of this work show that Ca adsorption onto phyllosilicate minerals generates a quantifiable isotopic fractionation by preferential uptake of the light isotope (40Ca) under our experimental conditions when the minerals have a significant structural charge and specific surface area and/or an interlayer space open to hydrated cations adsorption. A study on rhizoliths in natural environment has also highlighted that the combination of Ca and Sr isotopes allows an effective tracing of sources and mechanisms in the problematic related to the storage of these two elements within soils
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Papworth, Shannon P. "Evaluation of ion exchange as a pre-treatment option for coal seam gas water." Thesis, Queensland University of Technology, 2015. https://eprints.qut.edu.au/90057/14/90057_Shannon_Papworth_Thesis.pdf.

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The Coal Seam Gas (CSG) industry in Australia has grown significantly in recent years. During the gas extraction process, water is also recovered which is brackish in character. In order to facilitate beneficial reuse of the water, the CSG industry has primarily invested in Reverse Osmosis (RO) as the primary method for associated water desalination. However, the presence of alkaline earth ions in the water combined with the inherent alkalinity of the water may result in RO membrane scaling. Consequently, weak acid cation (WAC) synthetic ion exchange resins were investigated as a potential solution to this potential problem. It was shown that resins were indeed highly efficient at treating single and multi-component solutions of alkaline earth ions. The interaction of the ions with the resin was found to be considerably more complex that previously reported.
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Kaveeshwar, Aditya Rajeev. "Removal of Barium (II), Iron (II), and Strontium (II) from Fracking Wastewater Using Pecan Shell-Based Activated Carbon| Modelling of Adsorption Kinetics, Isotherms, and Thermodynamic Analysis." Thesis, University of Louisiana at Lafayette, 2019. http://pqdtopen.proquest.com/#viewpdf?dispub=10808217.

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Hydraulic fracturing generates wastewater ranging from 2 to 8.5 million gallons per well. Suspended solids, total dissolved solids, hydrocarbons, organic compounds, and heavy metals are some of the common contaminants present in the fracking wastewater. In this work, pecan shell-based activated carbon (PSBAC) was prepared, characterized, and applied for the removal of Ba (II), Fe (II), and Sr (II) from synthetic fracking wastewater. The PSBAC had a high specific surface area of 1516 m2/g and pore volume of 0.8 cm3/g. The effects of initial adsorbate concentration, adsorbent dose, and temperature were investigated, and an optimum condition for the present adsorption system was identified. Results showed that the Langmuir model best fit the adsorption systems with the PSBAC having maximum adsorptive capacity of 3.33 mg/g for Ba (II), 41.66 mg/g for Fe (II), and 8.8 mg/g for Sr (II). Kinetic studies revealed that sorption of the metals was not limited by intra-particle diffusion. The pseudo-second order kinetic model had the best fit, indicating chemisoprtion is the rate limiting step. The adsorption process was thermodynamically favorable and endothermic in nature.

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Al-Nasri, Salam Khudhair Abdullah. "Treatment of wastewater containing cobalt (Co-59) and strontium (Sr-89) as a model to remove radioactive Co-60 and Sr-90 using hierarchical structures incorporating zeolites." Thesis, University of Manchester, 2015. https://www.research.manchester.ac.uk/portal/en/theses/treatment-of-wastewater-containing-cobalt-co59-and-strontium-sr89-as-a-model-to-remove-radioactive-co60-and-sr90-using-hierarchical-structures-incorporating-zeolitesa(ff5cff3e-1366-4a35-9b15-0246811d6ad1).html.

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Zeolites were used in this study to remove two types of non-radioactive ions (Cobalt-59 and Strontium-89) from wastewater. This was designed to model the use of ion-exchange technique to remove radioactive Co-60 and Sr-90 from low level wastewater from Al-Tuwaitha site. Al-Tuwaitha site is a nuclear research in Iraq was used for radio-medical and radio-chemical purposes before 1990. In this study, hierarchical microporous/macroporous structures were developed to overcome the diffusivity problem using zeolite. Diatomite and carbon were used to prepare the composite adsorbents by incorporating them with three types of zeolites (A, Y and clinoptilolite). From the XRD, SEM and EDAX measurement it was confirmed that successfully prepared of Iraqi palm tree leafs-Clinoptlolite (IPClinp) and Tamarind stones-Clinoptilolite (TSClinp) composites were obtained in this study as there is no evidence in literature of this being carried out before. The carbons were prepared successfully through the Pyrolysis method for 2h at 900°C in an inert atmosphere from two types of raw waste plant materials of Iraqi Palm Tree leafs (IP) and Tamarind stones (TS). For both types of carbons, the SEM images show organised porosities in different shapes. A third material used as a zeolite scaffold was diatomite (Celatom FW-14) a readily available natural material (dead algae).A hydrothermal treatment was used to build the hierarchical structure of zeolite onto carbon and diatomite materials, the scaffolds were seeded with nano-zeolite crystals prior to the treatment and thereafter mixed with the zeolite gel composition mixture in a stainless steel autoclave. Zeolite seeds were prepared using ball mill method to reduce the particle size of the commercial zeolite to sub-micron range for each type of zeolite. The surface area, morphology, element compositions and structure for each type of zeolite and composite material were characterised using BET method, SEM, EDAX and XRD. The amounts of each type of zeolite on the carbon composites were determined using TGA while that of the diatomite composite was determined by gravimetric analysis. The results show that each type of zeolite was successfully deposited and uniformly organised onto the surface of all support materials. All pure zeolites and composite materials were successfully tested to remove Co2+ and Sr2+ ions from aqueous solutions. It was found that the composite materials had higher ability to remove both ions relative to the pure zeolites. This increase is attributed to the deposition of zeolite (microporous) onto the macroporous structure (carbon and diatomite) which increased the flow accessibility within zeolite in the hierarchical structured composites. Comparison of the removal between the two metal ions indicates that all of the materials had higher uptake for Sr2+ than Co2+ ions. The highest adsorption capacities were realised with Tamarind Stone–ZeoliteA (TSA) in the order 120mg.gz-1and 290mg.gz-1 for Co2+ and Sr2+ ions, respectively. The effect of the experimental variables shows increasing uptake with increasing pH and initial ion concentrations while it decreased with increasing the solution temperature. The Co2+ loaded composites was subjected to vitrification process at 12000C for 2h. The encapsulated composites were leached for 90 and 120 days and no significant Co2+ was recorded in the leached solution. The results show that the composite materials can be used effectively to remove the radioactive ion of Co-60 and Sr-90 ion as they display the same chemical behaviour as Co-59 and Sr-89 studied in this work.
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Wollmann, Philipp. "Synthese und Funktion nanoskaliger Oxide auf Basis der Elemente Bismut und Niob." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2012. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-85784.

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Am Beispiel von ferroelektrischen Systemen auf Bismut-Basis (Bismutmolybdat, Bismutwolframat und Bismuttitanat) und von Strontiumbariumniobat werden neue Möglichkeiten zur Synthese solcher Nanopartikel aufgezeigt. Die Integration der Nanopartikel in transparente Nanokompositmaterialien und die Entwicklung neuer Precursoren für die Herstellung von Dünnschichtproben gehen den Untersuchungen zur Anwendung als elektrooptische aktive Materialien voraus. Durch weitere Anwendungsmöglichkeiten in der Photokatalyse, dem Test dampfadsorptiver Eigenschaften mit Hilfe eines neuartigen Adsorptionstesters (Infrasorb) und auch mit Hilfe der Ergebnisse der ferroelektrischen Charakterisierung von gesinterten Probenkörpern aus einem Spark-Plasma-Prozess wird ein gesamtheitlicher Überblick über die vielfältigen Aspekte in der Arbeit mit nanoskaligen, ferroelektrischen Materialien gegeben.
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Books on the topic "Strontium Adsorption"

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Research, AECL. The sorption of strontium, barium and radium by chlorite and kaolinite: Effects of sorbent concentration and competition from groupe IIA elements. Pinawa, Man: Geochemistry Research Branch, Whiteshell Laboratories, 1998.

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2

Lyon, Kenneth E. Retention of ¹³⁷Cs and ⁹⁰Sr by mineral sorbents surrounding vitrified nuclear waste. Ottawa, Canada: National Hydrology Research Institute, Inland Waters Directorate, 1985.

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Book chapters on the topic "Strontium Adsorption"

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Li, Zhaoxu, Xiaoping Zhu, Min Zhang, Wei Guo, Qian Wu, and Jianguo Wang. "Study on Adsorption Model and Influencing Factors of Heavy Metal Cu2+ Adsorbed by Magnetic Filler Biofilm." In Lecture Notes in Civil Engineering, 503–13. Singapore: Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-99-1748-8_44.

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AbstractThe use of biofilm to repair heavy metal pollution in rivers has become a research hotspot in various countries and has attracted more and more attention. The adsorption of heavy metal ions by biofilm depends on many physical and chemical factors. In this paper, the model and its influencing factors of the adsorption of heavy metals by biofilm attached onto the magnetic fillers containing 10% strontium ferrite were studied. The study found that pH is the most important factor that interferes with the adsorption of heavy metal Cu2+ in biofilm. When the pH is 6.2, the adsorption capacity of heavy metal Cu2+ reaches maximum value. In comparison, temperature has no significant effect on the adsorption of Cu2+ by biofilm. When the temperature increases from 5 to 30℃, the adsorption rate of Cu2+ increased by 11.2% accordingly. This study has important theoretical reference value for heavy metal Cu2+ in-situ repairation in rivers or lakes using magnetic filler biofilm method.
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Gusain, Deepak, Shikha Dubey, Yogesh Chandra Sharma, and Faizal Bux. "Impact of Factors on Remediation of Major Toxic Elements (Vanadium, Chromium, Nickel, Arsenic, Strontium, Cadmium, Mercury, Lead, Uranium) Via Batch Adsorption Process." In Batch Adsorption Process of Metals and Anions for Remediation of Contaminated Water, 41–132. First edition. | Boca Raton : CRC Press, 2021.: CRC Press, 2021. http://dx.doi.org/10.1201/9781003006367-3.

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Lahuri, Azizul Hakim, Mohd Ambar Yarmo, and Maratun Najiha Abu Tahari. "Ultrasonic Assisted Synthesis of Bimetal Composite Strontium Oxide/Iron(III) Oxide for the Adsorption Isotherm Analysis of CO2 Capture." In Lecture Notes in Mechanical Engineering, 175–95. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-0742-4_12.

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Koshy, Nevin, and Pankaj Pathak. "Removal of Strontium by Physicochemical Adsorptions and Ion Exchange Methods." In The Handbook of Environmental Chemistry, 185–202. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-15314-4_10.

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Wang, Wei-Zi, Mark L. Brusseau, and Janick F. Artiola. "Nonequilibrium and Nonlinear Sorption during Transport of Cadmium, Nickel, and Strontium through Subsurface Soils." In Adsorption of Metals by Geomedia, 427–43. Elsevier, 1998. http://dx.doi.org/10.1016/b978-012384245-9/50021-9.

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Conference papers on the topic "Strontium Adsorption"

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AL-SHAHRANI, SAAD SAID. "ADSORPTION OF STRONTIUM IONS FROM WASTEWATER BY SAUDI ACTIVATED BENTONITE." In ENVIRONMENTAL IMPACT 2020. Southampton UK: WIT Press, 2020. http://dx.doi.org/10.2495/eid200211.

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Zuo, Rui, Can Du, Jinsheng Wang, and Xueru Guo. "A Comparative Study of the Adsorption Efficiency of Adsorption Materials for Wastewater Containing Strontium and Cesium." In Goldschmidt2020. Geochemical Society, 2020. http://dx.doi.org/10.46427/gold2020.3240.

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Savka, Khrystyna, Ivan Mironyuk, Igor Mykytyn, Hanna Vasylyeva, and Alexandr Vasyliev. "FEATURES OF ZIRCONIUM ION ADSORPTION BY SODIUM MODIFIED TITANIUM DIOXIDE." In 22nd SGEM International Multidisciplinary Scientific GeoConference 2022. STEF92 Technology, 2022. http://dx.doi.org/10.5593/sgem2022v/6.2/s24.01.

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The mechanism for the selective adsorption of zirconium ions in a highly acidic medium by sodium-modified titanium dioxide was proposed. The mechanism of adsorption of zirconium ions in an acidic medium by this adsorbent is similar to the mechanism of adsorption of strontium ions in a neutral medium. The selectivity of Na-TiO2 is due to the positively charged surface of the adsorbent in the highly acidic medium.
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Sviridov, A. V., V. V. Yurchenko, V. V. Sviridov, V. S. Semenishchev, A. F. Shabunin, and A. F. Nikiforov. "Adsorption-coagulation separation of cesium and strontium ions by intercalated aluminosilicates." In PHYSICS, TECHNOLOGIES AND INNOVATION (PTI-2019): Proceedings of the VI International Young Researchers’ Conference. AIP Publishing, 2019. http://dx.doi.org/10.1063/1.5134219.

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Merceille, Aure´lie, Agne`s Grandjean, and Yves Barre´. "Sodium Nonatitanate for Removal Radioactive Strontium From Aqueous Contaminated Effluent." In ASME 2011 14th International Conference on Environmental Remediation and Radioactive Waste Management. ASMEDC, 2011. http://dx.doi.org/10.1115/icem2011-59083.

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Sodium titanate materials which have a layered structure consisting of titanate layers and exchangeable sodium ions are promising inorganic ionic exchangers for strontium adsorption from aqueous solution. The materials used in this study include samples synthesized in a hydrothermal method at different temperatures between 60°C and 200°C. Batch kinetics experiments for strontium removal from aqueous solution were performed. Kinetics data were fitted by using a pseudo second order reaction model and a diffusive model. It was shown that the sorption process occurs in one or two diffusion-controlled steps that depend on the synthesis temperature. The strontium extraction capacity depends on the synthesis temperature with a maximum for sample synthesis at 100°C. This sample has good properties of decontamination at laboratory scale.
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Nanlohy, Ferdy, Anugrah Ricky Wijaya, Bambang Semedi, Eli Hendrik Sanjaya, Husni Wahyu Wijaya, and Desi Wulandari. "Adsorption of strontium (Sr2+) in seawater using adsorbent Fe3O4/MnO2/fulvic acid nanocomposite." In THE 4TH INTERNATIONAL CONFERENCE ON LIFE SCIENCE AND TECHNOLOGY (ICoLiST). AIP Publishing, 2023. http://dx.doi.org/10.1063/5.0112262.

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Nanlohy, Ferdy, Anugrah Ricky Wijaya, and Bambang Semedi. "Synthesis of Fe3O4/MnO2/Humic acid nanocomposite for strontium ion adsorption and its interferences." In INTERNATIONAL CONFERENCE ON LIFE SCIENCES AND TECHNOLOGY (ICoLiST 2020). AIP Publishing, 2021. http://dx.doi.org/10.1063/5.0052981.

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Nanlohy, Ferdy, Anugrah Ricky Wijaya, and Bambang Semedi. "Desorption and adsorption of strontium (Sr2+) from seawater by Fe3O4/MnO2/Humic acid nanocomposites." In INTERNATIONAL CONFERENCE ON LIFE SCIENCES AND TECHNOLOGY (ICoLiST 2020). AIP Publishing, 2021. http://dx.doi.org/10.1063/5.0052979.

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Peters, T. B., M. R. Poirier, F. F. Fondeur, C. A. Nash, D. T. Hobbs, and S. D. Fink. "Separation of Fission Products and Actinides From Savannah River Site High-Level Nuclear Wastes." In ASME 2009 12th International Conference on Environmental Remediation and Radioactive Waste Management. ASMEDC, 2009. http://dx.doi.org/10.1115/icem2009-16174.

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Separation methods for the pretreatment of the liquid fraction of high-level nuclear waste (HLW) at the Savannah River Site (SRS) include solvent extraction for the separation of cesium and adsorption/ion exchange for the removal of strontium and alpha-emitting actinides. The solvent extraction process, referred to as Caustic Side Solvent Extraction or CSSX, uses a calixarene extractant in combination with phase modifiers in a hydrocarbon diluent. Monosodium titanate (MST), a hydrous metal oxide, is the baseline material for the removal of strontium and alpha-emitting radionuclides (principally 238Pu, 239Pu, 240Pu and 237Np). Two pretreatment facilities, the Modular Caustic Side Solvent Extraction Unit (MCU) and the Actinide Removal Process (ARP) facility began radioactive operations at SRS in 2008. Together these facilities can treat approximately 4 million liters of waste per year. The same separation processes are also planned for the much larger Salt Waste Processing Facility (SWPF). The SWPF, which has a design throughput of about 27 million liters per year, is scheduled to begin radioactive operations in 2013. This paper presents an overview of the separation processes as well as recent research and development activities aimed at improving separation performance in the pretreatment facilities.
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Rahman, Yanuar, Anung Muharini, and Susetyo Hario Putero. "Analysis of strontium isothermal adsorption using metal-organic frameworks [HKUST-1] based on variation of operating temperatures and variations of main initial concentration." In INTERNATIONAL ENERGY CONFERENCE ASTECHNOVA 2019. AIP Publishing, 2020. http://dx.doi.org/10.1063/5.0001005.

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Reports on the topic "Strontium Adsorption"

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Fondeur, F. F. Sorption Modeling of Strontium, Plutonium, Uranium and Neptunium Adsorption on Monosodium Titanate. Office of Scientific and Technical Information (OSTI), October 2003. http://dx.doi.org/10.2172/817622.

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Serne, R. J., and V. L. LeGore. Strontium-90 adsorption-desorption properties and sediment characterization at the 100 N-Area. Office of Scientific and Technical Information (OSTI), January 1996. http://dx.doi.org/10.2172/186728.

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Hobbs, D. REVIEW OF EXPERIMENTAL STUDIES INVESTIGATING THE RATE OF STRONTIUM AND ACTINIDE ADSORPTION BY MONOSODIUM TITANATE. Office of Scientific and Technical Information (OSTI), October 2010. http://dx.doi.org/10.2172/1001173.

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MARK, CROWDER. In situ Removal of Actinides and Strontium from High Level Waste Tanks, Tea Bag versus Adsorption Column. Office of Scientific and Technical Information (OSTI), November 2004. http://dx.doi.org/10.2172/837908.

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