New insight into Eu(III) sorption mechanism at alumina/water interface by batch technique and EXAFS analysis
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S. T. Yang
Abstract
In this study, the interactions among Eu(III), humic acid (HA) and γ-Al2O3 as a function of pH and ionic strength were investigated by batch technique and extended X-ray absorption fine structure (EXAFS) analysis. For binary γ-Al2O3/Eu(III) systems, the pH-dependent and ionic strength-independent sorption behavior was indicative of an inner-sphere complexation mechanism. The EXAFS spectra analysis showed that Eu(III) sorption mechanisms at pH 5.0, 6.5 and 8.0 could be attributed to the formation of edge-shared and corner-shared surface complexes. In contrast, surface precipitation and/or surface polymerization tended to be the predominant sorption mechanism at pH 10.0. The spectra analysis results suggested no difference between the proportions of edge-shared and corner-shared complexes formed at different ionic strengths. For ternary γ-Al2O3/HA/Eu(III) systems, the sorption percentage of Eu(III) increased with increasing ionic strength. The EXAFS-derived structural parameters pointed to the formation of binary surface complexes (i.e., edge-shared mode and corner-shared mode) at low ionic strength and ligand-bridging ternary complexes at high ionic strength. In addition, the stoichiometry of ternary complexes showed a trend from 1:1 form (i.e., γ-Al2O3/L/Eu(III), L represents HA sites) to 1:2 form (i.e., γ-Al2O3/L2/Eu(III), L represents HA sites) with increasing ionic strength. The experimental findings in this study can provide an important theoretical basis for further predicting the fate of trivalent radionuclides in aquatic systems.
©2014 Walter de Gruyter Berlin/Boston
Articles in the same Issue
- Frontmatter
- Editorial
- Preface
- New nuclear facilities and their analytical applications in China
- Advances in computational actinide chemistry in China
- Recent advances in study of uranium surface chemistry in China
- Nuclear fuel cycle-oriented actinides separation in China
- Radiopharmaceuticals in China: current status and prospects
- Gas-phase chemistry of Mo, Ru, W, and Os metal carbonyl complexes
- Extraction complexes of Pu(IV) with carbamoylmethylphosphine oxide ligands: A relativistic density functional study
- Solvent extraction of uranium(VI) by a dipicolinamide using a room-temperature ionic liquid
- Evaluation study on a macroporous silica-based isohexyl-BTP adsorbent for minor actinides separation from nitric acid medium
- A density functional theory study of the competitive complexation of pyridine against H2O and Cl−− to Cm3+ and Ce4+
- Chemical behavior of neptunium in the presence of technetium in nitric acid media
- Nitrate conversion and supercritical fluid extraction of UO2-CeO2 solid solution prepared by an electrolytic reduction-coprecipitation method
- An advanced purex process based on salt-free reductants
- Extraction behavior of cesium and some typical fission and non-fission products with a new 1,3-di(1-decyloxy)-2,4-crown-6-calix[4]arene
- New insight into Eu(III) sorption mechanism at alumina/water interface by batch technique and EXAFS analysis
- Retention mechanisms and microstructure of Eu(III) on manganese dioxide studied by batch and high resolution EXAFS technique
- Extraction and purification of 227Ac and development of solid 219Rn source
- Mechanism of thorium biosorption by the cells of the soil fungal isolate Geotrichum sp. dwc-1
- Carbon-11 labeled stilbene derivatives from natural products for the imaging of Aβ plaques in the brain
- Synthesis, radiolabeling and in vivo biological evaluation of 99mTc-labeled MAG3-based bisnitroimidazole complexes as tumor hypoxia markers
- γ-radiation effect on dicyclohexano-18-crown-6 aqueous solution in the presence of metal cations
Articles in the same Issue
- Frontmatter
- Editorial
- Preface
- New nuclear facilities and their analytical applications in China
- Advances in computational actinide chemistry in China
- Recent advances in study of uranium surface chemistry in China
- Nuclear fuel cycle-oriented actinides separation in China
- Radiopharmaceuticals in China: current status and prospects
- Gas-phase chemistry of Mo, Ru, W, and Os metal carbonyl complexes
- Extraction complexes of Pu(IV) with carbamoylmethylphosphine oxide ligands: A relativistic density functional study
- Solvent extraction of uranium(VI) by a dipicolinamide using a room-temperature ionic liquid
- Evaluation study on a macroporous silica-based isohexyl-BTP adsorbent for minor actinides separation from nitric acid medium
- A density functional theory study of the competitive complexation of pyridine against H2O and Cl−− to Cm3+ and Ce4+
- Chemical behavior of neptunium in the presence of technetium in nitric acid media
- Nitrate conversion and supercritical fluid extraction of UO2-CeO2 solid solution prepared by an electrolytic reduction-coprecipitation method
- An advanced purex process based on salt-free reductants
- Extraction behavior of cesium and some typical fission and non-fission products with a new 1,3-di(1-decyloxy)-2,4-crown-6-calix[4]arene
- New insight into Eu(III) sorption mechanism at alumina/water interface by batch technique and EXAFS analysis
- Retention mechanisms and microstructure of Eu(III) on manganese dioxide studied by batch and high resolution EXAFS technique
- Extraction and purification of 227Ac and development of solid 219Rn source
- Mechanism of thorium biosorption by the cells of the soil fungal isolate Geotrichum sp. dwc-1
- Carbon-11 labeled stilbene derivatives from natural products for the imaging of Aβ plaques in the brain
- Synthesis, radiolabeling and in vivo biological evaluation of 99mTc-labeled MAG3-based bisnitroimidazole complexes as tumor hypoxia markers
- γ-radiation effect on dicyclohexano-18-crown-6 aqueous solution in the presence of metal cations
