Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
580178 | Journal of Hazardous Materials | 2010 | 8 Pages |
Abstract
A novel magnetic nano-adsorbent (MNP-NH2) has been developed by the covalent binding of 1,6-hexadiamine on the surface of Fe3O4 nanoparticles for removal of Cu2+ ions from aqueous solution. Various factors affecting the uptake behavior such as contact time, temperature, pH, salinity, amount of MNP-NH2 and initial concentration of Cu2+ were investigated. The kinetics was evaluated utilizing the Lagergren pseudo-first-order, pseudo-second-order, Elovich and intra-particle diffusion models. The equilibrium data were analyzed using Langmuir, Freundlich, and Dubinin-Radushkevich isotherms. The adsorption was relatively fast and the equilibrium was established within 5 min, and its kinetics followed the pseudo-second-order mechanism, evidencing chemical sorption as the rate-limiting step of sorption mechanism. The best interpretation for the equilibrium data was given by Langmuir isotherm, and the maximum adsorption capacities was 25.77 mg gâ1 at pH 6, and 298 K. Thermodynamic parameters showed that the adsorption process was spontaneous, endothermic and chemical in nature. The successive adsorption-desorption studies indicated that the MNP-NH2 sorbent kept its adsorption and desorption efficiencies constant over 15 cycles. Importantly, MNP-NH2 was able to remove 98% of Cu2+ from polluted river and tap water.
Related Topics
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Authors
Hao Yong-Mei, Chen Man, Hu Zhong-Bo,