Preparation of Electrospun Hydroxyapatite-Glass Fibers for Removal of Cadmium (Cd%2b2) and Lead (Pb%2b2) from Aqueous Media
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Hydroxyapatite-silica fibers were prepared by sol-gel process and electrospinning, and their capacity for adsorption of cadmium and lead ions in aqueous solution was studied. The samples were characterized by SEM, FTIR, TGA, DSC, BET, and XRD. The composite consists on a network of continuous rough fibers with mean diameter of 150 ± 40 nm after thermal treatment. The fibers present a mesoporous structure with pore size of 15.75 nm. Fourier transformed infrared spectroscopy and X-ray diffraction demonstrated the presence of crystalline hydroxyapatite and amorphous silica. Adsorption process is represented by Freundlich isotherm, while the adsorption kinetics follow the pseudo-second-order model. The capacity shown by the fibrous material for the removal of lead ions (466.98 mg/g) was five times higher than the capacity observed for the adsorption of cadmium (93.30 mg/g). Therefore, the hydroxyapatite-silica electrospun fibers represent a suitable material for the efficient removal of lead and cadmium ions from aqueous solution. © 2020, Springer Nature Switzerland AG.
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Adsorption; Electrospinning; Hydroxyapatite; Isotherm; Kinetics; Sol-gel Adsorption; Cadmium; Electrospinning; Fibers; Fourier transform infrared spectroscopy; Hydroxyapatite; Ions; Nanocrystalline materials; Pore size; Silica; Sol-gel process; Adsorption kinetics; Adsorption process; Crystalline hydroxyapatite; Electrospun fibers; Fourier transformed infrared spectroscopy; Freundlich isotherm; Mesoporous structures; Pseudo-second order model; Chemicals removal (water treatment); aluminum; cadmium; calcium ion; chitosan; glass fiber; hydroxyapatite; lead; nanoparticle; organic matter; polymer; adsorption; apatite; aqueous solution; cadmium; glass; isotherm; lead; pollutant removal; polymer; reaction kinetics; adsorption; adsorption kinetics; aqueous solution; Article; calculation; desorption; differential scanning calorimetry; Fourier transform infrared spectroscopy; isotherm; mathematical analysis; particle size; pH; scanning electron microscopy; surface property; synthesis; thermogravimetry; waste component removal; X ray diffraction
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