期刊
WATER AIR AND SOIL POLLUTION
卷 148, 期 1-4, 页码 111-125出版社
KLUWER ACADEMIC PUBL
DOI: 10.1023/A:1025401927023
关键词
adsorption isotherm; cadmium; chromium; copper; counter-ion; lead; nickel; zinc
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.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据