Removal of nickel ions from water by multi-walled carbon nanotubes

Multi-walled carbon nanotubes (MWCNTs) were produced by chemical vapor decomposition using acetylene gas in the presence of Ferrocene catalyst at 800 °C, and then oxidized with concentrated nitric acid at 150 °C. Both (as-produced and oxidized) CNTs were characterized by TEM, Boehm titration, N 2-BE...

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Bibliographic Details
Published in:Journal of hazardous materials 2007-07, Vol.146 (1), p.283-288
Main Authors: Kandah, Munther Issa, Meunier, Jean-Luc
Format: Article
Language:English
Subjects:
Adsorption
Applied sciences
Biological and physicochemical phenomena
Carbon nanotubes
Catalysis
Catalytic reactions
Chemical engineering
Chemistry
Exact sciences and technology
General and physical chemistry
Hydrogen-Ion Concentration
Ion Exchange
Nanotubes, Carbon - chemistry
Natural water pollution
Nickel
Nickel - chemistry
Oxidation-Reduction
Pollution
Reactors
Sodium - chemistry
Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry
Water Pollutants, Chemical - chemistry
Water pollution
Water Purification - methods
Water treatment and pollution
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Summary:Multi-walled carbon nanotubes (MWCNTs) were produced by chemical vapor decomposition using acetylene gas in the presence of Ferrocene catalyst at 800 °C, and then oxidized with concentrated nitric acid at 150 °C. Both (as-produced and oxidized) CNTs were characterized by TEM, Boehm titration, N 2-BET and cation exchange capacity techniques. The adsorption capacity for nickel ions from aqueous solutions increased significantly onto the surface of the oxidized CNTs compared to that on the as-produced CNTs. The effects of adsorption time, solution pH and initial nickel ions concentrations on the adsorption uptake of Ni 2+ for both the as-produced and oxidized CNTs were investigated at room temperature. Both Langmuir and Freundlich isotherm models match the experimental data very well. According to the Langmuir model the maximum nickel ions adsorption uptake onto the as-produced and oxidized CNTs were determined as 18.083 and 49.261 mg/g, respectively. Our results showed that CNTs can be used as an effective Ni 2+ adsorbent due to the high adsorption capacity as well as the short adsorption time needed to achieve equilibrium.
ISSN:0304-3894
1873-3336
DOI:10.1016/j.jhazmat.2006.12.019