Rhenium(VII) and technetium(VII) separation from aqueous solutions using a polyethylenimine–epichlorohydrin resin
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The ReO4 – and 99TcO4 – removal from aqueous solutions using a polyethylenimine–epichlorohydrin resin was investigated in absence and presence of background electrolyte (0.01 and 0.50 M NaCl). Re(VII) and Tc(VII) sorption isotherms were obtained for solutions with 2.3 ≤ pH ≤ 8.9 and concentration 0.21–26.9 mmol Re/L and 5 × 10−3 – 5 × 10−2 mmol 99Tc/L. The highest uptake for both elements (R d ≈ 104 mL/g) was observed for solutions with pH ≤ 4 and CNaCl ≤ 0.01 M, hinting towards the existence of protonated groups contributing to the sorption of anions under acidic conditions and to the competition of Cl−. The sorption data were modeled using the Langmuir and Freundlich equations.
KeywordsSorption Polyethylenimine–epichlorohydrin resin Pertechnetate anions Perrhenate anions Sorption isotherms
The Tc studies were performed during the research stay of the corresponding author (P.M.) at the Institute for Nuclear Waste Disposal of the Karlsruhe Institute of Technology (INE–KIT) from March till August 2013. The funding by KIT as well as the support and the hospitality from the side of the Director as well as the scientific and technical staff of the INE during this stage is gratefully acknowledged. The authors of this work would also like to thank Dr. D. Schild (INE–KIT), Assoc. Prof. E. Pavlidou (Department of Physics, AUTh) and Mrs. M. Böttle (INE–KIT) for their valuable assistance with the XPS, SEM/EDS and Tc-measurements.
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