Comparison of Heavy Metal Adsorptions by Thai Kaolin and Ballclay

被引:1
作者
V. Chantawong
N. W. Harvey
V. N. Bashkin
机构
[1] King Mongkut's University of Technology,Joint Graduated School of Energy and Environment
[2] King Mongkut's University of Technology,School of Energy and Materials
来源
Water, Air, and Soil Pollution | 2003年 / 148卷
关键词
adsorption isotherm; cadmium; chromium; copper; counter-ion; lead; nickel; zinc;
D O I
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中图分类号
学科分类号
摘要
The adsorption characteristics of heavy metals: cadmium(II), chromium(III), copper(II), nickel(II), lead(II), and zinc(II) ions by kaolin (kaolinite) and ballclay (illite) from Thailand were studied. This research was focussed on the pH, adsorption isotherms of single-metal solutions at 30–60 °C by batch experiments, and on ion selectivityin mixed and binary combination solutions. It was found that, except Ni, metal adsorption increased with increased pH of the solutions and their adsorption followed both Langmuir and Freundlich isotherms. Adsorption of metals in the mixture solutions by kaolin was: Cr > Zn > Cu ≈ Cd ≈ Ni > Pb, and for ballclay was: Cr > Zn > Cu > Cd ≈ Pb > Ni. The adsorption of metals was endothermic, with the exception of Cd, Pb and Zn for kaolin, Cu and Zn for ballclay. Kaolin and ballclay exhibited relatively hard Lewis base adsorption site. The presence of other metals may reduce or promote the adsorption of heavy metals. The presence of Cr3+ induced the greatest reduction of metal adsorptiononto kaolin, as did the presence of Cu2+ for ballclay.
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页码:111 / 125
页数:14
相关论文
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