Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5410420 | Journal of Molecular Liquids | 2016 | 6 Pages |
Abstract
The adsorption of Eu(III) from aqueous solutions onto monoclinic pyrrhotite (M-Pyr) was studied by batch experiments under various experimental conditions. M-Pyr was synthesized and characterized by XRD, FT-IR, SEM and potentiometric titration. The macroscopic results showed that the adsorption of Eu(III) on M-Pyr was independent of ionic strength, indicating that inner-sphere surface complexation predominated their adsorption. The kinetic adsorption process was well described by pseudo-second-order model with high correlation coefficient (R2Â >Â 0.999). The adsorption isotherms indicated that the adsorption of Eu(III) on M-Pyr fitted by Langmuir model was better than Freundlich model. The maximum adsorption capacity of Eu(III) on M-Pyr calculated from Langmuir model was 10.03Â mg/g at pHÂ 5.0 and 293Â K. The thermodynamic parameters suggested that the adsorption of Eu(III) on M-Pyr was a spontaneous and endothermic processes. According to XPS analysis, the adsorption of Eu(III) on M-Pyr was mainly dominated by ion exchange and inner-sphere surface complexation at low pH and high pH conditions, respectively.
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Authors
Yuke Zhu, Haibo Liu, Tianhu Chen, Bin Xu, Ping Li,