Adsorption behavior of heavy metal ions by carbon nanotubes grown on microsized Al2O3 particles

作者：Hsieh Shu Huei; Horng Jao Jia

来源：Journal of University of Science and Technology Beijing, 2007, 14(1): 77-84.

DOI：10.1016/S1005-8850(07)60016-4

• carbon nanotube
• heavy metal
• adsorption
• alumina

Carbon nanotubes (CNTs) were grown on the surface of microsized Al2O3 particles in CH, atmosphere at 700 degrees C under the catalysis of Fe-Ni nanoparticles. The CNTs on Al2O3 were used for adsorbing Pb2+, Cu2+, and Cd2+ from the solution and the results were compared with active carbon powders, commercial carbon nanotubes, and Al2O3 particles. The as-grown CNTs/Al2O3 have demonstrated extraordinary absorption capacity with further treatment or oxidation, as well as hydrophilic ability that other CNTs lacked. The adsorption capacity of CNTs on Al2O3 is superior to other adsorbents and the preference order of adsorption on composite Al2O3 is Ph2+> Cu2+> Cd2+. It seemed that the adsorption of those Ph2+, Cu2+, and Cd2+ did not change the surface properties of composite particles. The adsorption behaviors of Ph2+, Cu2+, and Cd2+ by CNTs on Al2O3 match well with the Langmuir isothermal adsorption model and the second order kinetic model. The calculated saturation amount adsorbed by 1 g of CNTs on Al2O3 are 67.11, 26.59, and 8.89 mg/g for Pb2+, Cu2+, and Cd2+ in single adsorption test, respectively.

• 出版日期2007-2