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標題: Sorption kinetics, thermodynamics and competition of Ni2+ from aqueous solutions onto surface oxidized carbon nanotubes
作者: Lu, C.Y.
Liu, C.T.
Su, F.S.
關鍵字: Carbon nanotubes;Sorption;Nickel;Kinetics;Thermodynamics;Competition;activated carbons;adsorption;removal;water;equilibrium;copper;nickel;zinc(ii)
Project: Desalination
期刊/報告no:: Desalination, Volume 249, Issue 1, Page(s) 18-23.
Singlewalled carbon nanotubes (SWCNTs) and multiwalled carbon nanotubes (MWCNTs) were oxidized by NaClO solutions and were employed as sorbents to study their sorption kinetics and thermodynamics of Ni2+ from aqueous solutions. The amount of Ni2+ sorbed onto SWCNTs and MWCNTs increased with a rise in temperature. The sorption kinetics follows the pseudo-second-order rate law while the sorption thermodynamics indicates the endothermic and spontaneous nature. Under the same conditions, the SWCNTs and MWCNTs possess better performance of Ni2+ sorption than the commercially available granular activated carbon, reflecting that both CNTs are efficient Ni2+ sorbents in water and wastewater treatment. The competitive sorption of Ni2+ and Zn2+ onto SWCNTs and MWCNTs was also conducted and revealed that the sorption capacities of Ni2+ and Zn2+ Without competition are much greater than those with competition. The competition which Zn2+ exerts on the sorption of Ni2+ is stronger than the competition exerted by Ni2+ on the sorption of Zn2+. (C) 2009 Elsevier B.V. All rights reserved.
ISSN: 0011-9164
DOI: 10.1016/j.desal.2009.06.009
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