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Wang M.,Anhui Medical University | Jun Q.,Anhui Medical University | Xie H.,Environmental Monitoring Station of Dongguan City | Tao X.,Anhui Medical University | And 2 more authors.
Journal of Radioanalytical and Nuclear Chemistry | Year: 2012

Herein, the sorption properties of Eu(III) on Na-attapulgite were performed by using batch sorption experiments under different experimental conditions, such as contact time, pH, ionic strength, humic acid and temperatures. The results indicated that the sorption of Eu(III) on Na-attapulgite was strongly dependent on pH and temperature. At low pH values, the sorption of Eu(III) was influenced by ionic strength, whereas the sorption was not affected by ionic strength at high pH values. The sorption of Eu(III) was mainly dominated by ion exchange or outersphere surface complexation at low pH values, and by inner-sphere surface complexation or surface precipitation at high pH values. The sorption of Eu(III) onto Na-attapulgite increased with increasing temperature. The Langmuir and Freundlich models were applied to simulate the sorption isotherms, and the results indicated that the Langmuir model simulated the sorption isotherms better than the Freundlich model. The thermodynamic parameters (δG o, δS o, δH o) were calculated from the temperature dependent sorption isotherms at 293, 313 and 333 K, respectively, and the results indicated that the uptake of Eu(III) on Na-attapulgite was an endothermic and spontaneous process. The results of high Eu(III) sorption capacity on Na-attapulgite suggest that the attapulgite is a suitable material for the preconcentration and immobilization of Eu(III) ions from large volumes of aqueous solutions. © 2012 Akadémiai Kiadó, Budapest, Hungary. Source


Xie H.,Environmental Monitoring Station of Dongguan City | Li X.,Environmental Monitoring Station of Dongguan City | Cheng C.,Lanzhou University | Wu D.,Environmental Monitoring Station of Dongguan City | And 3 more authors.
Journal of Radioanalytical and Nuclear Chemistry | Year: 2012

A novel composite adsorbent, magnetite/hydroxyapatite (Fe 3O 4/HAP) composites, was prepared by biowaste chicken eggshell for the purpose of removing radiocobalt from aqueous solutions. It highlighted that more than 92% Co(II) could be removed by using the developed composites under the experimental conditions. The maximum sorption capacity of Co(II) on Fe 4O 4/HAP composites was 6.9 × 10 -4 mol/g. The coexisted foreign ions, e.g., ClO 4 -, NO 3 -, Cl -, Na + and K + , did not interfere the elimination of Co(II) from aqueous solutions, while Mg 2+ did. The sorption process was found to be controlled well by pseudo-second-order and intra-particle diffusion models, and the equilibrium data were simulated by Langmuir model very well with high correlation coefficients. The thermodynamic parameters confirmed the spontaneity and endothermic nature of Co(II) sorption processes. After sorption, the Fe 3O 4/HAP composites could be effectively and fleetly separated from aqueous solutions by magnetic separation technique in large scale. The Fe 3O 4/HAP composites are suitable materials in the preconcentration of Co(II) from large volumes of aqueous solutions. © 2012 Akadémiai Kiadó, Budapest, Hungary. Source

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