Comparison of heavy metal adsorptions by thai kaolin and ballclay

被引:163
作者
Chantawong, V [1 ]
Harvey, NW
Bashkin, VN
机构
[1] King Mongkuts Univ Technol Thonburi, Joint Grad Sch Energy & Environm, Bangkok, Thailand
[2] King Mongkuts Univ Technol Thonburi, Sch Energy & Mat, Bangkok, Thailand
[3] Moscow MV Lomonosov State Univ, Fac Geog, Moscow, Russia
关键词
adsorption isotherm; cadmium; chromium; copper; counter-ion; lead; nickel; zinc;
D O I
10.1023/A:1025401927023
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
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 degreesC by batch experiments, and on ion selectivity in 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 approximate to Cd approximate to Ni > Pb, and for ballclay was: Cr > Zn > Cu > Cd approximate to 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 adsorption onto kaolin, as did the presence of Cu2+ for ballclay.
引用
收藏
页码:111 / 125
页数:15
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