Adsorption Behavior of Cesium and Strontium on Synthetic Zeolite P.

Mimura, Hidenori; Akiba, Kenichi

doi:10.3327/jnst.30.436

Cited by 24 publications

(26 citation statements)

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“…Among them, ion exchange using different materials is the most studied [14]. Much attention has been focused toward the uptake of Cs + on zeolites [15][16][17][18], clay minerals [13,14,[19][20][21][22], and other adsorbents [23][24][25][26][27].…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Tobermorite from the Ash after Treatment of Asbesto-Containing Disaster Waste, and Its Removal Ability of Cs(I) from Aqueous Solution

Wajima

2016

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Abstract. Tobermorite was synthesized successfully from the ash, which was produced and detoxified from asbesto-containing disaster waste in great east Japan earth quake, by alkali hydrothermal treatment. Tobermorite synthesis was examined as a function of reaction temperature and NaOH concentration. The formation of tobermorite was identified in the product treated with 1-4 M NaOH solution at 130 and 180 o C, while no product phases was identified at 80 o C. With increasing reaction temperature, intensity of tobermorite phase in the product and Cs + removal ability of the product increase. The product, which was treated with 4 M NaOH at 180 o C for 20 h, revealed the high selective uptake for Cs + in saline water. The Cs + uptake of the product was extrapolated using Langmuir and Freundlich isotherm models, experimental data are found to fit Langmuir than Freundlich, and the calculated uptake amount was 0.51 mmol/g. The kinetics for Cs + uptake was tested for pseudo-second order reactions, and the rate constants of uptake were calculated. With increasing temperature of aqueous solution, the kinetics of uptake is almost same and the uptake amount of Cs + decreases. The product is expected to be used for Cs + removal from wastewater.

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Section: Introductionmentioning

confidence: 99%

Synthesis of Tobermorite from the Ash after Treatment of Asbesto-Containing Disaster Waste, and Its Removal Ability of Cs(I) from Aqueous Solution

Wajima

2016

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“…Figure 1, the XRD pattern of sample 1 (M) that was a solid fraction in the reaction mixture before the first hydrothermal treatment was identical with that of clinoptilolite [19]. XRD peaks of sample 2 (MHT) that was a solid fraction involved in the reaction mixture after the first hydrothermal treatment showed that the peaks of clinoptilolite were disappeared and other peaks assigned to zeolite-P [20] were newly formed during the first hydrothermal treatment in a strong alkaline medium. Dissolution of clinoptilolite in this stage gave rise to a sol of aluminosilicate monomer and oligomers.…”

Section: Analysesmentioning

confidence: 87%

“…Since Si/Al ratio of zeolite-P, e.g., 1.67 [20] was lower than that of clinoptilolite, 7.50, an aluminum rich portion of the sol was converted to zeolite-P in this stage, while most of the remainder of the sol which was probably rich in silicate species was available for the formation of mesostructure with 2d hexagonal symmetry in the stage of pH adjustment as discussed in a following section. It was reported that zeolite-P with Si/Al ratio of 1.67 was obtained by hydrothermal treatment of natural mordenite and clinoptilolite with NaOH solutions above 1 M at temperatures between 333 and 373 K [20]. The conditions of the first hydrothermal treatment of natural clinoptilolite in the present study were similar to those of the literature [20].…”

Section: Analysesmentioning

confidence: 99%

“…It was reported that zeolite-P with Si/Al ratio of 1.67 was obtained by hydrothermal treatment of natural mordenite and clinoptilolite with NaOH solutions above 1 M at temperatures between 333 and 373 K [20]. The conditions of the first hydrothermal treatment of natural clinoptilolite in the present study were similar to those of the literature [20]. Intensity of XRD peaks assigned to zeolite-P for sample 2 (MHT) decreased by the adjustment of pH to 10.5 and 8.5 as shown in sample 3 (MTH10.5) and sample 4 (MHT8.5).…”

Section: Analysesmentioning

confidence: 99%

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Synthesis of MCM-41 with Zeolite-P from Natural Clinoptilolite for Silica-alumina Source Under Hydrothermal Conditions in Alkaline Media

Shindo

Nagai

Ikeuchi

et al. 2011

Int.J.Soc.Mater.Eng.Resour.

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Mesoporous molecular sieve MCM-41 and zeolite-P were synthesized from natural clinoptilolite zeolite and cetyltrimethylammonium bromide under hydrothermal conditions in alkaline media. The formation path of MCM-41 and zeolite-P from natural clinoptilolite was investigated using XRD, TG, SEM, and FT-IR for the samples obtained in the course of the synthesis. XRD and TG results exhibited that in the first stage where the mixture of clinoptilolite and cetyltrimethylammonium bromide was treated in alkaline media at ambient temperature, crystal structure of clinoptilolite did not change significantly. In the second stage where the mixture was subsequently treated under hydrothermal conditions, dissolution of clinoptilolite and formation of zeolite-P were observed, while mesophase with 2d hexagonal structure of MCM-41 was not detected. In the third stage, mesostructure with 2d hexagonal symmetry was gradually formed by the adjustment of pH of the reaction mixture between 10.5 and 8.5. Structural integrity of 2d hexagonal assembly of as-synthesized MCM-41 was improved by controlling pH of the reaction mixture to 8.5 followed by the hydrothermal treatment. In contrast, the structure of zeolite-P was not affected by these treatments. SEM images of the samples showed that small particles of MCM-41 were mainly formed on the surface of the zeolite-P particles and agglomerated to larger grains. Judging from the results of XRD patterns and FT-IR spectra of the samples, it is indicated that smaller crystallites or building units of clinoptilolite that were X-ray amorphous and IR detectable were probably incorporated in the pore walls of MCM-41.

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“…19 A 300 cm 3 ) with frequent shaking for 2 d at room temperature. The concentration of each cation in the solution before and after uptake of cations was determined by atomic absorption spectrometry.…”

Section: Uptake Of Csmentioning

confidence: 99%

Cesium Ion Exchange on Synthetic Birnessite (Na0.35MnO2·0.6H2O)

Chitrakar¹,

Makita²,

Sonoda³

2011

Chemistry Letters

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Uptake of Cs+ on poorly crystalline layered manganese oxide (Na birnessite) is reported. Distribution coefficients (K d ) showed significant uptake of Cs + under acidic (pH 2.4) or basic conditions (pH 10.2). The uptake of Cs + takes place with release of Na + into the solution confirming ion exchange. The maximum uptake of Cs + was 2.0 mmol g ¹1 at pH 10.2.The principal long-term problem caused by nuclear accidents is the contamination of the environment with radioactive 137 Cs, because cesium is very volatile and can be carried long distances.

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Adsorption Behavior of Cesium and Strontium on Synthetic Zeolite P.

Cited by 24 publications

References 0 publications

Synthesis of Tobermorite from the Ash after Treatment of Asbesto-Containing Disaster Waste, and Its Removal Ability of Cs(I) from Aqueous Solution

Synthesis of Tobermorite from the Ash after Treatment of Asbesto-Containing Disaster Waste, and Its Removal Ability of Cs(I) from Aqueous Solution

Synthesis of MCM-41 with Zeolite-P from Natural Clinoptilolite for Silica-alumina Source Under Hydrothermal Conditions in Alkaline Media

Cesium Ion Exchange on Synthetic Birnessite (Na0.35MnO2·0.6H2O)

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