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KMID : 1024520160250121613
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Journal of the Environmental Sciences
2016 Volume.25 No. 12 p.1613 ~ p.1622
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Fabrication of PAN/FZ Beads Via Immobilization of Zeolite Prepared from Coal Fly Ash with Polyacrylonitrile and Their Sr and Cu Removal Characteristics
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Kam Sang-Kyu
Lee Chang-Han
Jeong Kap-Seop
Lee Min-Gyu
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Abstract
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Zeolite (FZ), prepared from fly ash, was immobilized with polyacrylonitrile (PAN) to fabricate PAN/FZ beads. The prepared PAN/FZ beads were characterized by scanning electron microscopy, thermogravimetric analysis, and Fourier transform infrared spectroscopy. The optimum ratio to prepare PAN/FZ beads was 0.3 g of PAN to 0.3 g of FZ. The diameter of the prepared PAN/FZ beads was about 3 mm. Sr and Cu ion adsorption experiments were conducted with PAN/FZ beads. A pseudo-second-order model fit the kinetic data for Sr and Cu ion adsorption by PAN/FZ beads well. The equilibrium data fitted well with the Langmuir isotherm model, and the maximum adsorption capacities were 96.5 mg/g and 74.6 mg/g for the Sr and Cu ions, respectively. Additionally, the values of thermodynamic parameters such as Gibbs free energy (ΔGo), enthalpy (ΔHo) and entropy (ΔSo) were determined. The positive values of ΔHo revealed the endothermic nature of the adsorption process and the negative values of ΔGo were indicative of the spontaneity of the adsorption process.
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KEYWORD
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Adsorption, Zeolite, Strontium, Copper, Polyacrylonitrile
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