Synthesis of crown ether functionalized polyacrylamide gel beads and their extraction behaviour for strontium ions

Sivanatham, Murugaboopathi; Tata, Butchi Venkata Rao; Babu, C. Anand

doi:10.1080/19443994.2012.664106

Cited by 10 publications

(4 citation statements)

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“…The absorption band at 1648 cm –1 is specific for the CN bond from Schiff base groups . The peak at 1548 cm –1 for the CC skeletal stretching vibration of the phenyl ring is observed . The absorption band at 1475 cm –1 indicates the C–O stretching vibrations .…”

Section: Results and Discussionmentioning

confidence: 99%

“…21 The peak at 1548 cm −1 for the CC skeletal stretching vibration of the phenyl ring is observed. 22 The absorption band at 1475 cm −1 indicates the C−O stretching vibrations. 23 The features at 1108, 965, 800, and 476 cm −1 are assigned to the stretching vibrations of Si−O−Si, Si−OH, and Si−O groups, and the bending vibration of Si−O−Si groups, respectively.…”

Section: Apparatusmentioning

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: Results and Discussionmentioning

confidence: 99%

Section: Apparatusmentioning

confidence: 99%

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

et al. 2019

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“…The absorption band at 1651 cm À1 was specific for C=O bonds from crown ether molecules. The peak at 1552 cm À1 for the C=C skeletal stretching vibration of the phenyl ring was observed (Sivanatham et al 2012). The absorption band at 1477 cm À1 indicated a C-O stretching vibration (Kim et al 1998).…”

Section: Characterisationmentioning

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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“…Over the past few decades several interesting properties and applications of polyacrylamide (PAAm) hydrogels have been explored after selectively modifying their molecular structures using various processes such as hydrolysis [1][2][3][4], or immobilizing external components such as colloidal crystals [5], crown ether (CE) [6] and various functional groups [7][8][9] within their networks. For instance, Tanaka et al [1] have studied the phase transition behaviour of hydrolysed PAAm hydrogels in various concentrations of acetone/water mixture.…”

Section: Introductionmentioning

confidence: 99%

Structural investigation on gamma-irradiated polyacrylamide hydrogels using small-angle neutron scattering and ultraviolet–visible spectroscopy

2015

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Small-angle neutron scattering (SANS) and ultraviolet (UV)-visible spectroscopic techniques are used to investigate the microstructural changes in polyacrylamide (PAAm) hydrogels on gamma irradiation. SANS measurements have revealed the presence of inhomogeneities in nanometre scale and reduction of their size with increase in dose. Analysis of SANS data also revealed the increase in the correlation length with increase in dose. The extinction coefficient obtained from the UV-visible spectroscopic studies exhibited λ −β dependence between 500 and 700 nm and is understood to arise from the existence of scatterers (inhomogeneities) in submicron scale in PAAm hydrogels. The increase in value of exponent β with increase in dose indicates that the size of scatterers decrease with increase in dose.

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Synthesis of crown ether functionalized polyacrylamide gel beads and their extraction behaviour for strontium ions

Cited by 10 publications

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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

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

Structural investigation on gamma-irradiated polyacrylamide hydrogels using small-angle neutron scattering and ultraviolet–visible spectroscopy

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Synthesis of crown ether functionalized polyacrylamide gel beads and their extraction behaviour for strontium ions

Cited by 10 publications

References 0 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

Structural investigation on gamma-irradiated polyacrylamide hydrogels using small-angle neutron scattering and ultraviolet–visible spectroscopy

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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