Adsorption of Sr(II) and Eu(III) on Na-rectorite: Effect of pH, ionic strength, concentration and modelling
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Jun Hu
Abstract
The surface charge characteristics of Na-rectorite (NaAl4[Si,Al]8O20(OH)4·n H2O) were studied by potentiometric acid-base titrations. Sr(II) and Eu(III) adsorptions on Na-rectorite as a function of pH, ionic strength, and Sr(II)/Eu(III) concentrations were carried out to investigate the surface interactions between Sr(II)/Eu(III) with Na-rectorite. The results indicated that the adsorptions of Sr(II) and Eu(III) on Na-rectorite increased with increasing pH and decreased with increasing ionic strength and initial Sr(II)/Eu(III) concentrations, and that the affinity of Na-rectorite for Eu(III) was much higher than for Sr(II). The experimental data of Sr(II)/Eu(III) adsorption were simulated by the diffuse-layer model (DLM) well with the aid of FITEQL 3.2. Simultaneous adsorptions of Sr(II) and Eu(III) on Na-rectorite were also modeled using the DLM. The adsorption mechanisms of Sr(II) and Eu(III) on Na-rectorite may be dominated by ion exchange interaction at low pH or moderate pH, and by surface complexation interaction at high pH.
© by Oldenbourg Wissenschaftsverlag, Hefei, Anhui, Germany
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Articles in the same Issue
- Evaluation of charged particle induced reaction cross section data for production of the important therapeutic radionuclide 186Re
- Redox behavior of Ce(IV)/Ce(III) in the presence of nitrilotriacetic acid: A surrogate study for An(IV)/An(III) redox behavior
- Supercritical carbon dioxide extraction of uranium from acidic medium employing crown ethers
- Application of indigenous inorganic sorbents in combination with membrane technology for treatment of radioactive liquid waste from decontamination processes
- Adsorption of Sr(II) and Eu(III) on Na-rectorite: Effect of pH, ionic strength, concentration and modelling
- Exploitation of the sorptive properties of mica for the preparation of higher-resolution alpha-spectroscopy samples
- A novel method for radiochemical separation of radioyttrium from Sr targets using precipitation technique
- Selected trace and minor elements in sandstones from Paraguay
