Effects of phosphate and ionic strength upon uranium(VI) sorption onto alumina as a function of pH
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Guo Zhijun
Summary
The sorption edges and the sorption isotherms of UO22+ onto alumina were determined by a batch technique in the presence and absence of phosphate at pH range 3–6, ionic strength range 0.05–0.5 mol/L and UO22+ concentrations 10-5–10-4 mol/L. The dependence of sorption percentage of UO22+ onto Al2O3 as a function of initial concentration of phosphate was also investigated. The effects of phosphate and ionic strength on the sorption of UO22+ onto Al2O3 as a function of pH were emphatically investigated. It was found that the pH value and the presence of phosphate play a very important role in the UO22+ sorption onto Al2O3, even if the concentration of phosphate is only a half of the concentration of UO22+. The sorption steeply increases with increasing pH from 3 to 6, and the sorption is enhanced with increasing concentration of phosphate at sorption percentage lower than 97%. The ionic strength is insensitive to UO22+ sorption in the ionic strength range from 0.05 to 0.1 mol/L KNO3, while the sorption is slightly decreased with increasing ionic strength from 0.1 to 0.5 mol/L. The enhanced sorption of UO22+ is attributed to the formation of ternary surface complexes involving UO22+ and phosphate.
© by Oldenbourg Wissenschaftsverlag, München
Artikel in diesem Heft
- Attempts to chemically investigate element 112
- Distribution studies on Th(IV), U(VI) and Pu(IV) using tri-n-butylphosphate and N,N-dialkyl amides
- Solvent extraction studies on Th(IV) and U(VI) using PolyEthylene Glycol (PEG) based aqueous biphasic system (ABS) with 18-crown-6
- The aqueous complexation of thorium with citrate under neutral to basic conditions
- Production of [124I]-iodine on an 11 MeV cyclotron
- Electroplating/electrodissolution/recovery cycle for rhodium target used for an industrial scale cyclotron production of palladium-l03
- Effects of phosphate and ionic strength upon uranium(VI) sorption onto alumina as a function of pH
- Adsorption of lanthanum to goethite in the presence of gluconate
Artikel in diesem Heft
- Attempts to chemically investigate element 112
- Distribution studies on Th(IV), U(VI) and Pu(IV) using tri-n-butylphosphate and N,N-dialkyl amides
- Solvent extraction studies on Th(IV) and U(VI) using PolyEthylene Glycol (PEG) based aqueous biphasic system (ABS) with 18-crown-6
- The aqueous complexation of thorium with citrate under neutral to basic conditions
- Production of [124I]-iodine on an 11 MeV cyclotron
- Electroplating/electrodissolution/recovery cycle for rhodium target used for an industrial scale cyclotron production of palladium-l03
- Effects of phosphate and ionic strength upon uranium(VI) sorption onto alumina as a function of pH
- Adsorption of lanthanum to goethite in the presence of gluconate
