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KMID : 1024520200290070739
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Journal of the Environmental Sciences
2020 Volume.29 No. 7 p.739 ~ p.748
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Adsorption Characteristics of Ni2+, Zn2+ and Cr3+ by Zeolite Synthesized from Jeju Scoria
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Kim Jung-Tae
Lee Chang-Han
Kam Sang-Kyu
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Abstract
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The characteristics of heavy metal ion (Ni2+, Zn2+, and Cr3+) adsorption by zeolite synthesized from Jeju scoria using the fusion and hydrothermal method, were studied. The synthetic zeolite was identified as a Na-A zeolite by X-ray diffraction analysis and scanning electron microscopy images. The equilibrium of heavy metal ion adsorption by synthetic zeolite was reached within 60 min for Ni2+ and Zn2+, and 90 min for Cr3+. The uptake of heavy metal ions increased with increasing pH in the range of pH 3-6 and the uptake decreased in the order of Cr3+ > Zn2+ > Ni2+. For initial heavy metal concentrations of 20-250 mg/L at nonadjusted pH, the adsoption of heavy metal ions was well described by the pseudo second-order kinetic model and was well fitted by the Langmuir isotherm model. The maximum uptake of heavy metal ions obtained from the Langmuir model, decreased in the order of Zn2+ > Ni2+ > Cr3+, differing from the effect of pH on the uptake, which was mainly based on the different pH of the solutions.
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KEYWORD
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Scoria, Synthetic zeolite, Adsorption, Heavy metal ions
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