Removal of heavy metals from aqueous solution by carbon nanotubes: adsorption equilibrium and kinetics

被引：0
|
作者：
LI Yan-hui 1
2 Department of Mechanical Engineering
机构：
来源：
Journal of Environmental Sciences | 2004年 / 02期
关键词：
carbon nanotubes; heavy metals; adsorption;
D O I：
暂无
中图分类号：
X131.2 [水污染化学];
学科分类号：
083001 ;
摘要：
Carbon nanotubes prepared by catalytic chemical vapor deposition of hydrocarbon at 650℃ show good adsorption capability of Pb 2+ , Cu 2+ and Cd 2+ ions from aqueous solution after oxidized with concentrated nitric acid at 140℃ for 1 h. The specific surface area and particle size distribution of the as-grown and oxidized CNTs were studied by BET method and laser particle analyzer. Three kinetic models, that is, first-, pseudo second- and second-order, were used to investigate the adsorption data and the pseudo second-order model can represent the experimental data better than two others. The equilibrium data fitted well with the Langmuir model and showed the following adsorption order: Pb 2+ >Cu 2+ >Cd 2+ .
引用
收藏
页码：208 / 211
页数：4
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