期刊
SOLVENT EXTRACTION AND ION EXCHANGE
卷 30, 期 4, 页码 422-430出版社
TAYLOR & FRANCIS INC
DOI: 10.1080/07366299.2012.687180
关键词
Cadmium(II); microcapsules; sorption; equilibrium; kinetics; thermodynamics
资金
- National Fund of Science and Technology of Chile (CONICYT) through project FONDECYT [1100151]
- CONICYT
The equilibrium, kinetics, and thermodynamics of Cd(II) sorption from aqueous solutions onto polymeric microcapsules has been studied. Microcapsules were prepared by immobilizing an acidic organophosphonic extractant in a polymeric matrix prepared from styrene and ethylene glycol dimethacrylate following in situ free-radical suspension polymerization. Scanning electronic microscopy showed that the microcapsules were spherical and exhibited a rough surface with an average BET surface area of 12-20 m(2) g(-1) and an approximate pore size of 7.0 nm. The microcapsules were contacted with aqueous solutions containing Cd(II) approximately 100 mg L-1 at an initial pH = 4.0 to study their sorptive behaviour over a temperature range of 293-323 K. The results of equilibrium experiments showed that the results filled the Langmuir isotherm model. The experimental kinetics followed a pseudo-second order model with an activation energy of 47.1 +/- 2.2 kJ mol(-1). Thermodynamics measurements showed that sorption is spontaneous and exothermic and that entropy had a negative value.
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