Cs immobilization using the formation of the glassy phase by the heat-treatment of natural mordenite

Aono, Hiromichi; Takahashi, Ryuichiroh; Itagaki, Yoshiteru; Johan, Erni; Matsue, Naoto

doi:10.1016/j.jnucmat.2018.05.027

Cited by 11 publications

(5 citation statements)

References 17 publications

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“…As a representative of zeolite, mordenite (MOR) has developed pore structure and excellent adsorption properties, while the aluminosilicate can also provide metal cations, and the regular topological structure of MOR makes it have <1 nm micropore, so it has great potential in the adsorption and separation of Rb and cesium. 30 Herein, from the point of view of process coupling and synergism, P(S-co-VPh) containing phenolic hydroxyl group was blended with MOR to prepare MOR/P(S-co-VPh) nanofiber composite membranes by electrospinning. The structure of MOR/P(S-co-VPh) nanofiber composite membrane was analyzed by Fourier transform infrared spectroscopy (FTIR), XRD, scanning electron microscope (SEM), and energy dispersive x-ray spectroscopy (EDS).…”

Section: Introductionmentioning

confidence: 99%

“…Cs + was mainly exchanged with K + , Na + , Ca 2+ , Mg 2+ , and so on. As a representative of zeolite, mordenite (MOR) has developed pore structure and excellent adsorption properties, while the aluminosilicate can also provide metal cations, and the regular topological structure of MOR makes it have <1 nm micropore, so it has great potential in the adsorption and separation of Rb and cesium 30 …”

Section: Introductionmentioning

confidence: 99%

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Preparation of MOR/P(S‐co‐VPh) nanofiber composite membrane and its adsorption properties for rubidium ions

Fei,

Shi,

Wang

et al. 2024

J of Applied Polymer Sci

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Rubidium (Rb), a rare and precious metal, is widely used in high‐tech fields. In this work the structural advantages of mordenite (MOR) and group affinity of phenolic hydroxyl polymers (poly (styrene‐4‐hydroxystyrene) (P(S‐co‐VPh)) are combined to prepare MOR/P(S‐co‐VPh) nanofiber composite membranes with high selectivity and adsorption specificity for Rb+ by electrospinning. The test results show that MOR is successfully anchored on the nanofiber substrate and maintained its complete crystal structure. Adsorption experiments show that the adsorption capacity of Rb+ increases with the increase of MOR content, and pH = 9.0, T = 25°C are the best adsorption conditions. K+ shows the most obvious interference with the adsorption capacity decreased from 60.03 to 39.33 mg/g. The adsorption process follows with the Langmuir isothermal model and pseudo‐second‐order kinetic equation. The chemical adsorption based on the coordination reaction is the control step, and the intraparticle diffusion also has an important effect on the adsorption rate. The recycling test indicates that the prepared nanofiber composite membrane not only has efficient adsorption of Rb+, but also exhibits excellent regeneration and stability, which helps to achieve its widespread application and long‐term operation in harsh environments.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Preparation of MOR/P(S‐co‐VPh) nanofiber composite membrane and its adsorption properties for rubidium ions

Fei,

Shi,

Wang

et al. 2024

J of Applied Polymer Sci

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“…Cesium and strontium are high-yield fission products that are present in significant amounts in fuel pond waters and reprocessing stream liquors [ 7 ]. Radioactive contamination can occur as a result of working with radioisotopes, an accident, or even a terrorist attack [ 8 ]. A nuclear explosion is followed by the production of a considerable quantity of radioactive cesium isotope 137 Cs (1.6 times greater than 90 Sr) [ 3 ].…”

Section: Introductionmentioning

confidence: 99%

Strippable Polymeric Nanocomposites Comprising “Green” Chelates, for the Removal of Heavy Metals and Radionuclides

et al. 2021

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The issue of heavy metal and radionuclide contamination is still causing a great deal of concern worldwide for environmental protection and industrial sites remediation. Various techniques have been developed for surface decontamination aiming for high decontamination factors (DF) and minimal environmental impact, but strippable polymeric nanocomposite coatings are some of the best candidates in this area. In this study, novel strippable coatings for heavy metal and radionuclides decontamination were developed based on the film-forming ability of polyvinyl alcohol, with the remarkable metal retention capacity of bentonite nanoclay, together with the chelating ability of sodium alginate and with “new-generation” “green” complexing agents: iminodisuccinic acid (IDS) and 2-phosphonobutane-1,2,4-tricarboxylic acid (PBTC). These environmentally friendly water-based decontamination solutions are capable of generating strippable polymeric films with optimized mechanical and thermal properties while exhibiting high decontamination efficiency (DF ≈ 95–98% for heavy metals tested on glass surface and DF ≈ 91–97% for radionuclides 241Am, 90Sr-Y and 137Cs on metal, painted metal, plastic, and glass surfaces).

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“…Among LTA, P, FAU-X, FAU-Y, MOR zeolites, MOR has shown the highest selectivity for Cs + with no correlation with the cationic exchange capacity [5]. Natural MOR has been used as inexpensive Cs + adsorbate in Fukushima and tested to form a glassy phase at high temperature (1000 °C or 900 °C with Na 2 CO 3 ) for long-term storage [12]. Zeolites have been proposed to be used in series with columns filled with HexaCyanoFerrate (HCF) as K 2 FeCu(CN) 6 (Cu-HCF) immobilized on polymeric polyacrylic fibers to reach a high factor of decontamination [13].…”

Section: Introductionmentioning

confidence: 99%

Nanocrystals FAU-X monoliths as highly efficient microreactors for cesium capture in continuous flow

Didi

Said

Micolle

et al. 2019

Microporous and Mesoporous Materials

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The performances of binderless FAU-X monoliths (0.5 x 3 cm) build of nanocrystals featuring hierarchical trimodal porosity (micro-/meso-/macroporosity) in decontamination Cs-containing effluents have been evaluated. They have been compared to those obtained with newly synthesized FAU-X particles (1 mm) build with nanocrystals. Data have been confronted to those recently reported for a benchmark reference Cs + adsorbent Sorbmatech®, based on copper hexacyanoferrate nanoparticles (15 nm) immobilized into mesoporous silica particles (250-500 µm) (Cu-HCF@SiO 2 ). FAU-X monoliths show high rate of adsorption in batch in less than 2 min, much faster than Cs + adsorption in FAU-X particles (60 min). This result highlights the importance of a homogeneous macropore network in adsorbents to enhance mass transport and access to the zeolite active sites. FAU-X monoliths with 20 µm macropore diameter have been used in continuous flow experiments for sequestering Cs + (0.5 mmol/L) in mineral drinking water containing competing cations (Ca 2+ , Mg 2+ , Na + , K + ) with flow rates of 0.5 to 1 mL/min, corresponding to Darcy rates of 1.5 -3 m/h. FAU-X monoliths are very efficient for Cs + removal and show ideal steep breakthrough curves characteristic of fast diffusion. FAU-X monoliths are as excellent as Cu-HCF@SiO 2 and could represent an alternative adsorbent for safer processes, avoiding the handling of powders or particles. Above all, this study reveals the unique hydrodynamic behavior of FAU-X monoliths and opens the route for process intensification using FAU-X in continuous flow.

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Cs immobilization using the formation of the glassy phase by the heat-treatment of natural mordenite

Cited by 11 publications

References 17 publications

Preparation of MOR/P(S‐co‐VPh) nanofiber composite membrane and its adsorption properties for rubidium ions

Preparation of MOR/P(S‐co‐VPh) nanofiber composite membrane and its adsorption properties for rubidium ions

Strippable Polymeric Nanocomposites Comprising “Green” Chelates, for the Removal of Heavy Metals and Radionuclides

Nanocrystals FAU-X monoliths as highly efficient microreactors for cesium capture in continuous flow

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