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Carbon nanotubes prepared by catalytic chemical vapor deposition of hydrocarbon at 650℃ show goodadsorption capability of Pb2+ , Cu2+ and Cd2+ ions from aqueous solution after oxidized with concentrated nitric acidat 140℃ for 1 h. The specific surface area and particle size distribution of the as-grown and oxidized CNTs werestudied by BET method and laser particle analyzer. Three kinetic models, that is, first-, pseudo second- andsecond-order, were used to investigate the adsorption data and the pseudo second-order model can represent theexperimental data better than two others. The equilibrium data fitted well with the Langmuir model and showed thefollowing adsorption order: Pb2+ ＞ Cu2+ ＞ Cd2+.
