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Issue 43, 2012
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Enhanced adsorption of Eu(III) on mesoporous Al2O3/expanded graphite composites investigated by macroscopic and microscopic techniques

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Abstract

Mesoporous Al2O3 was intercalated into an expanded graphite (EG) interlayer to prepare mesoporous Al2O3/EG composites. The basal spacing of mesoporous Al2O3/EG composites was enlarged as compared to raw graphite from the X-ray diffraction analysis. The massive surface functional groups and wedge-shaped pores were observed in terms of potentiometric acid–base titration analysis and scanning electron microscope, respectively. The pH-dependent adsorption of Eu(III) on mesoporous Al2O3/EG composites was evidently independent of ionic strength. The maximum adsorption capacity of Eu(III) on mesoporous Al2O3/EG composites at pH 6.0 and T = 293 K was calculated to be 5.14 mg g−1. Desorption kinetics and cyclic operation results showed that mesoporous Al2O3/EG composites presented high hydrothermal stability in aqueous solution. The thermodynamic parameters suggested that Eu(III) adsorption on mesoporous Al2O3/EG composites is an endothermic and a spontaneous process. The decrease of Eu–O bond distance with the increasing pH demonstrated that the adsorption mechanism between Eu(III) and mesoporous Al2O3/EG composites would shift from outer-sphere surface complexation to inner-sphere surface complexation in terms of extended X-ray absorption fine structure spectroscopy analysis.

Graphical abstract: Enhanced adsorption of Eu(iii) on mesoporous Al2O3/expanded graphite composites investigated by macroscopic and microscopic techniques

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Publication details

The article was received on 10 Jul 2012, accepted on 03 Sep 2012 and first published on 03 Sep 2012


Article type: Paper
DOI: 10.1039/C2DT31510F
Citation: Dalton Trans., 2012,41, 13388-13394

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    Enhanced adsorption of Eu(III) on mesoporous Al2O3/expanded graphite composites investigated by macroscopic and microscopic techniques

    Y. Sun, C. Chen, X. Tan, D. Shao, J. Li, G. Zhao, S. Yang, Q. Wang and X. Wang, Dalton Trans., 2012, 41, 13388
    DOI: 10.1039/C2DT31510F

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