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

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