May 15 – 20, 2022
Casino Conference Centre
Europe/Prague timezone

Treatment of spent decontamination solutions based on citric acid with oxidic nanoparticles sorbents

May 20, 2022, 10:30 AM
22m
Red Hall

Red Hall

Verbal Separation Methods, Speciation Separation & Speciation

Speaker

Ota Fišera (Military Research Institute, SoE, CZE)

Description

Composite sorbents based on nanoparticles of NiO, NiO-TiO2 and ZrO2-TiO2 were chosen for treatment of spent decontamination solutions based on citric acid. Active oxidic materials were prepared by photoinduced synthesis (NiO, NiO-TiO2) or hydrolytic method (ZrO2-TiO2). Weight distribution ratios for radionuclides 241Am, 60Co, 137Cs a 90Sr/90Y and others were investigated in the course of the experiments performed in pH range 2–12. High sorption capacities up to 9 mmol∙g-1 for 137Cs were found by sorption isotherm experiments. Dynamic experiments were performed with simulated spent decontamination solutions based on citric acid. Elution of radionuclides was tested with mineral acids (HCl, HNO3, HClO4) or complexing agents (citric acid, Na3NTA, HEDP). Under suitable conditions, 85 % of radionuclide was eluted in 6times lower volume compared to treated spent solution. Bleeding of Ni ions from active components was detected during half-scale test due to ICP-MS analysis.

Primary authors

Lenka Prouzová Procházková ((Czech Technical University in Prague, Faculty of Nuclear Sci- ences and Physical Engineering, Department of Nuclear Chemistry) Martin Vlk ((Czech Technical University in Prague, Faculty of Nuclear Sci- ences and Physical Engineering, Department of Nuclear Chemistry) Ota Fišera (Military Research Institute, SoE, CZE)

Co-authors

Jan Kozempel ((Czech Technical University in Prague, Faculty of Nuclear Sci- ences and Physical Engineering, Department of Nuclear Chemistry) Jaroslav Kareš (Military Research Institute, SoE, CZE) Kateřina Fialová (Czech Technical University in Prague, Faculty of Nuclear Sciences and Physical Engineering, Department of Nuclear Chemistry) Martin Palušák ((Czech Technical University in Prague, Faculty of Nuclear Sci- ences and Physical Engineering, Department of Nuclear Chemistry) Václav Čuba ((Czech Technical University in Prague, Faculty of Nuclear Sci- ences and Physical Engineering, Department of Nuclear Chemistry)

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