Journal
CHEMICAL ENGINEERING JOURNAL
Volume 218, Issue -, Pages 46-54Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2012.12.027
Keywords
Adsorption; Cu(II); EDTA-functionalized; Magnetic nano-particles; Removal
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Funding
- National Basic Research Program of China (973 Program) [2010CB833101]
- National Natural Science Foundation of China [21072221]
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The EDTA functionalized magnetic nano-particles (MNPs-EDTA) as a novel magnetic nano-adsorbent have been prepared by a simple one-pot method for the removal of Cu(II) from aqueous solution. Factors affecting the adsorption of Cu(II) on MNPs-EDTA, such as contact time, temperature, pH, salinity, and initial concentration of Cu(II), were investigated. The studies on the adsorption revealed that the adsorption process obeyed the pseudo-second order kinetic model, the determining step might be chemical sorption and the adsorption equilibrium could be achieved in 5 min. Among the various isotherm models, the experimental data for the adsorption of Cu(II) followed the Langmuir isotherm best and the maximum adsorption capacities was 46.27 mg g(-1) at pH 6.0 and 298 K. Thermodynamic parameters declared that the adsorption process was endothermic and spontaneous. The removal efficiencies of Cu(II) were over 98.3% and inappreciably influenced by the water matrix. In addition, the adsorption-desorption studies indicated that MNPs-EDTA had a high stability and good reusability. (C) 2012 Elsevier B.V. All rights reserved.
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