Characterization of Co(II) removal from aqueous solution using bentonite/iron oxide magnetic composites |
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Authors: | Liang Chen Yan Huang Lingli Huang Bin Liu Gang Wang Shaoming Yu |
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Institution: | (1) School of Chemical Engineering, Hefei University of Technology, Hefei, 230009, Anhui, People’s Republic of China; |
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Abstract: | The bentonite/iron oxide magnetic composites were prepared by co-precipitation method, and characterized by Fourier transform
infrared spectroscopy, X-ray powder diffraction and scanning electron microscope. The prepared bentonite/iron oxide magnetic
composites were used as a sorbent for the removal of Co(II) ions from radioactive wastewater. The results demonstrated that
the sorption of Co(II) was strongly dependent on pH and ionic strength at low pH values. The sorption of Co(II) was dominated
by outer-sphere surface complexation or ion exchange at low pH whereas inner-sphere surface complexation was the main sorption
mechanism at high pH. The presence of iron oxide in the composites also contributes to the sorption of Co(II) ions on the
magnetic composites. The experimental data were well described by Langmuir model. The thermodynamic parameters (∆G
°, ∆S
°, ∆H
°) calculated from the temperature-dependent sorption isotherms indicated that the sorption of Co(II) on bentonite/iron oxide
magnetic composites was an endothermic and spontaneous processes. |
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Keywords: | |
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