期刊
CHEMICAL ENGINEERING JOURNAL
卷 222, 期 -, 页码 240-247出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2013.02.055
关键词
Chelating resin; Cu(II); Complex formation; Interaction mechanisms; Density-Functional-Theory
资金
- State Key Program of National Natural Science [50938004]
- Resources Key Subject of National High Technology Research & Development Project (863 Project), PR China [2009AA06Z315, SQ2009AA06XK1482331]
The novel chelating resin Dowex M-4195 was selected and applied to investigate the static adsorption properties and interaction nature toward aqueous Cu(II) from acid solutions. The isotherm data could be well described by Langmuir model, and the kinetic curves could be successfully fitted with the pseudo-second-order equation. In strong acid solutions at the pH-value of 2, the obtained adsorption capacity was 1.592 mmol/g, about 50% more than that at the higher pH-value of 5. The adsorption mechanism of Cu(II) onto Dowex M-4195, especially at the pH-value of 2, were further explored using the Density-Functional-Theory. The theoretical calculations confirmed the three nitrogen atoms would be all involved in the coordination with tridentate complex and thus the two five-member ring structure could be achieved. Additionally, the XPS spectra testified the involvement of nitrogen atoms, which told the coordination ratio might be 1:1. Whereas, in weak acidic solutions at the pH value of 5, the ion exchange mechanism involving the protonated pyridine of solid matrix and Cu(II) was dominant. Consequently, high efficient removal of Cu(II) especially from strong acidic solutions could be achieved, an indication of a potential and preponderant new method to recover heavy metals from acidic effluents without sufficient neutralization pretreatment. (C) 2013 Elsevier B.V. All rights reserved.
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