[show abstract][hide abstract] ABSTRACT: Carbon nanotubes prepared by catalytic chemical vapor deposition of hydrocarbon at 650 degrees C show good adsorption capability of Pb2+, Cu2+ and Cd2+ ions from aqueous solution after oxidized with concentrated nitric acid at 140 degrees C 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 equilibriumdata fitted well with the Langmuir model and showed the following adsorption order: Pb2+ > Cu2+ > Cd2+.
Journal of Environmental Sciences 02/2004; 16(2):208-11. · 1.77 Impact Factor
[show abstract][hide abstract] ABSTRACT: We have modified the conventional arc discharge method for the synthesis of high quality single-walled carbon nanotube (SWNT) silks with high purity (over 70%) by using a hollow cathode that can collect SWNTs effectively. Characterizations of these SWNT materials by XRD, UV−vis−near-IR, Raman were taken. Finally a simple process involving subsequent acid treatment to align the SWNTs locally in the thin silks was introduced.
Journal of Physical Chemistry B - J PHYS CHEM B. 06/2003; 107(27).