Separation of calcium-48 isotope by crown ether chromatography using ethanol/hydrochloric acid mixed solvent

Okumura, Shin; Umehara, S.; Fujii, Yasuhiko; Nomura, Masao; Kaneshiki, Toshitaka; Ozawa, Masaki; Kishimoto, T.

doi:10.1016/j.chroma.2015.08.057

Cited by 10 publications

(3 citation statements)

References 15 publications

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“…Lauth and Gramain reported that the performance of the cation separation strongly depends on the chemical structure of the bound crown ether, and on the preparation process and the choice of the silica support . Recently, a porous silica bead embedded with benzo-18-crown-6 ether was used for the selective separation of Ca 2+ ions. , …”

Section: Introductionmentioning

confidence: 99%

“…14 Recently, a porous silica bead embedded with benzo-18-crown-6 ether was used for the selective separation of Ca 2+ ions. 15,16 The sol−gel process has emerged as a promising platform for the preparation of the organic−inorganic hybrid silica gel. 17−19 In this work, the third approach, a combination of the sol−gel process with Schiff base reaction, was developed for the preparation of benzo-18-crown-6-ether-functionalized silica (BCES).…”

Section: Introductionmentioning

confidence: 99%

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Sol–Gel Derived Benzo-Crown Ether-Functionalized Silica Gel for Selective Adsorption of Ca²⁺ Ions

et al. 2019

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Benzo-crown ether-functionalized silica (BCES) was prepared by the combination of the sol−gel process and the Schiff base reaction, characterized by Fourier transmission infrared spectroscopy, scanning electron microscopy, and N 2 adsorption−desorption, and used for the selective adsorption of Ca 2+ ions. The adsorption amounts of the BCES for Ca 2+ ions were independent of pH in the range of 5−10. Adsorption equilibrium was performed within 60 min. The adsorption capacity of the BCES for Ca 2+ ions was found to be 40.6 mg g −1 at 298 K. The high selectivity of the BCES for Ca 2+ ions with respect to the other alkali and alkaline earth metals was attributed to the high affinity between Ca 2+ ions and crown ether. The adsorption/ desorption cycle of the BCES could be up to five times. Langmuir and pseudo-second-order equations provided good correlation for the adsorption of Ca 2+ ions. The thermodynamics of Ca 2+ ions/BCES system indicates spontaneous and endothermic nature.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Sol–Gel Derived Benzo-Crown Ether-Functionalized Silica Gel for Selective Adsorption of Ca²⁺ Ions

et al. 2019

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“…Crown ethers are a class of compound that can form very stable molecular ensembles or complexes with alkaline and alkaline earth metals (Pedersen 1967;Stover 1984;Høiland et al 1979). The previous literature has reported that benzo-18crown-6 ether has been successfully used for the selective separation of Ca 2þ relative to other alkali metal cations (Capel-Cuevas et al 2009;Okumura et al 2015;Nemoto et al 2013). The PES membrane is an excellent performance material for membrane separation due to its superior mechanical and chemical properties (Liu et al 2011).…”

Section: Introductionmentioning

confidence: 99%

In-situ sampling of available calcium using diffusive gradients in thin-films technique based on benzo-crown ether-functionalised silica as the binding agent

You

Cao

et al. 2018

Environ. Chem.

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Environmental contextLow availability of calcium (Ca2+) in soils is one of the major factors in Ca2+ deficiency of plants and physiological plant disorders. A device based on functionalised silica was developed for in-situ measurement of the available Ca2+ in soils. Application of the proposed device to measure available Ca2+ may help to develop and improve agricultural practices. AbstractCalcium is an ion of particular interest due to its importance in plant nutrition and soil structure. A novel device of diffusion gradients in thin-films (DGT) based on the benzo-crown ether-functionalised silica (BCES) as the binding agent and the polyethersulfone (PES) membrane as diffusive layer (BCES-DGT) was developed for in-situ sampling of available calcium (Ca2+) in freshwater and soil samples. The performance characteristics of the BCES-DGT device were assessed. The BCES was prepared using the sol-gel process and characterised by Fourier transform infrared spectroscopy, scanning electron microscopy, thermal gravimetric analysis and N2 adsorption–desorption. Results evinced that BCES was obtained successfully with a rough wrinkled surface and good specific surface area of 111.3 m2 g−1. The diffusion coefficient of Ca2+ ions in PES membrane was found to be 1.23 × 10−6 cm2 s−1 at 25 °C and was independent of pH in the range of 3–10 and ionic strength (as pNaCl) from 1 to 3. The high binding capacity of BCES binding gel for Ca2+ ions was determined to be 9822.4 ± 452.9 μg Ca2+/disk and was conducive to the deployment of long-term or high concentration. The BCES-DGT device can accurately measure the concentrations of Ca2+ over wide ranges of ionic strengths (1–3 as pNaCl) and pH (5–10). There was no significant interference on the uptake of Ca2+ by the BCES-DGT device at the tolerance limits up to 500 for Mg2+, Li+, HCO3−, H2PO4−, NO3− and SO42−, 250 for Sr2+, 2000 for K+ and 50 for fulvic acid. The results from BCES-DGT device were in excellent agreement with those measured directly using ion selective electrode in several water and soil samples. Field application in river water indicated that a good agreement was obtained between BCES-DGT value and mean grab sample measurements of Ca2+ and that the relative standard deviation of BCES-DGT measurement (4.7 %) was superior to that of grab sample measurements (13.5 %), suggesting that BCES-DGT was reliable for in-situ sampling and measurement of available Ca2+ with good accuracy and precision.

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Ion-pair extraction-reaction of calcium using Y-shaped microfluidic junctions: An optimized separation approach

Jahromi

Karimi-Sabet

Amini

2018

Chemical Engineering Journal

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Separation of calcium-48 isotope by crown ether chromatography using ethanol/hydrochloric acid mixed solvent

Cited by 10 publications

References 15 publications

Sol–Gel Derived Benzo-Crown Ether-Functionalized Silica Gel for Selective Adsorption of Ca²⁺ Ions

Sol–Gel Derived Benzo-Crown Ether-Functionalized Silica Gel for Selective Adsorption of Ca²⁺ Ions

In-situ sampling of available calcium using diffusive gradients in thin-films technique based on benzo-crown ether-functionalised silica as the binding agent

Ion-pair extraction-reaction of calcium using Y-shaped microfluidic junctions: An optimized separation approach

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Separation of calcium-48 isotope by crown ether chromatography using ethanol/hydrochloric acid mixed solvent

Cited by 10 publications

References 15 publications

Sol–Gel Derived Benzo-Crown Ether-Functionalized Silica Gel for Selective Adsorption of Ca2+ Ions

Sol–Gel Derived Benzo-Crown Ether-Functionalized Silica Gel for Selective Adsorption of Ca2+ Ions

In-situ sampling of available calcium using diffusive gradients in thin-films technique based on benzo-crown ether-functionalised silica as the binding agent

Ion-pair extraction-reaction of calcium using Y-shaped microfluidic junctions: An optimized separation approach

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Sol–Gel Derived Benzo-Crown Ether-Functionalized Silica Gel for Selective Adsorption of Ca²⁺ Ions

Sol–Gel Derived Benzo-Crown Ether-Functionalized Silica Gel for Selective Adsorption of Ca²⁺ Ions