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KMID : 1024520160250111485
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Journal of the Environmental Sciences
2016 Volume.25 No. 11 p.1485 ~ p.1491
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Removal Characteristics of Cu(II) by PSf/D2EHPA/CNT Beads Prepared by Immobilization of Carbon Nanotubes (CNT) and Di-(2-ethylhexyl)-phosphoric acid (D2EHPA) on Polysulfone (PSf)
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Lee Chang-Han
Lee Min-Gyu
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Abstract
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PSf/D2EHPA/CNT beads were prepared by immobilizing di-(2-ethylhexyl)-phosphoric acid (D2EHPA) and carbon nanotubes (CNT) on polysulfone (PSf) and used to remove Cu(II) from aqueous solutions. Optimum pH was in the range of 4 to 6. The removal kinetic of Cu(II) by the prepared PSf/D2EHPA/CNT beads was mainly governed by internal diffusion, and the diffusion coefficient of Cu(II) by PSf/D2EHPA/CNT beads was found to be 2.19×10-4∼2.64×10-4 cm2/s. The Langmuir isotherm model predicted the experimented data well. The maximum removal capacity of Cu(II) obtained from this isotherm was 7.32 mg/g. Calculated thermodynamic parameters such as ΔGo, ΔHo and ΔSo showed that the adsorption of Cu(II) ions onto PSf/D2EHPA/CNT beads was feasible, spontaneous and endothermic at 293?323 K.
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KEYWORD
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Carbon nanotube (CNT), D2EHPA, Polysulfone, Immobilization, Copper ion
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