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    Tytuł:
    Trends in radiochemistry at the beginning of the 21st century
    Autorzy:
    Narbutt, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/147944.pdf
    Data publikacji:
    2005
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    radiochemistry
    nuclear power
    radiopharmaceutical chemistry
    chemistry of radioelements
    radionuclides
    Opis:
    A review on selected - the most important and most prospective - directions of the present-day radiochemistry has been presented, with a special emphasis on the research carried out at the Department of Radiochemistry, Institute of Nuclear Chemistry and Technology.
    Źródło:
    Nukleonika; 2005, 50,suppl.3; 77-81
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Adsorption of strontium, europium and americium(III) ions on a novel adsorbent Apatite II
    Autorzy:
    Krejzler, J.
    Narbutt, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/148382.pdf
    Data publikacji:
    2003
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    adsorption
    americium
    Apatite II
    europium
    hydroxyapatite
    nuclear waste
    strontium
    Opis:
    A novel material, Apatite II, obtained from a natural source, has been determined to be a good adsorbent for radionuclides of strontium, europium and trivalent actinides, but not caesium, from neutral aqueous solutions containing common chelating agents and inorganic salts at moderate concentrations. This inexpensive, easily available material seems to be a promising backfill for engineered barriers in nuclear waste repositories. However, encapsulation of the sorbent grains loaded with radiostrontium in the Portland cement matrix results in undesirably high leaching rate for this particular radionuclide.
    Źródło:
    Nukleonika; 2003, 48, 4; 171-175
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    SACSESS : the EURATOM FP7 project on actinide separation from spent nuclear fuels
    Autorzy:
    Bourg, S.
    Geist, A.
    Narbutt, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/971486.pdf
    Data publikacji:
    2015
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    actinide separation
    minor actinides
    nuclear fuel reprocessing
    partitioning
    solvent extraction
    pyrochemical separations
    Opis:
    Recycling of actinides by their separation from spent nuclear fuel, followed by transmutation in fast neutron reactors of Generation IV, is considered the most promising strategy for nuclear waste management. Closing the fuel cycle and burning long-lived actinides allows optimizing the use of natural resources and minimizing the long-term hazard of high-level nuclear waste. Moreover, improving the safety and sustainability of nuclear power worldwide. This paper presents the activities striving to meet these challenges, carried out under the Euratom FP7 collaborative project SACSESS (Safety of Actinide Separation Processes). Emphasis is put on the safety issues of fuel reprocessing and waste storage. Two types of actinide separation processes, hydrometallurgical and pyrometallurgical, are considered, as well as related aspects of material studies, process modeling and the radiolytic stability of solvent extraction systems. Education and training of young researchers in nuclear chemistry is of particular importance for further development of this field.
    Źródło:
    Nukleonika; 2015, 60, No. 4, part 2; 809-814
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Determination of formation constants of uranyl(VI) complexes with a hydrophilic SO3-Ph-BTP ligand, using liquid-liquid extraction
    Autorzy:
    Steczek, L.
    Narbutt, J.
    Charbonnel, M. -C.
    Moisy, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/147774.pdf
    Data publikacji:
    2015
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    uranyl ion
    hydrophilic poly-N-dentate ligands
    complexes
    solvent extraction
    stripping
    formation constant
    Opis:
    Complex formation between uranyl ion, UO2 2+, and a hydrophilic anionic form of SO3-Ph-BTP4– ligand, L4–, in water was studied by liquid-liquid extraction experiments performed over a range of the ligand and HNO3 concentrations in the aqueous phase, at a constant concentration of nitrate anions at 25°C . The competition for UO2 2+ ions between the lipophilic TODGA extractant and the hydrophilic L4– ligand leads to the decrease in the uranyl distribution ratios, D, with an increasing L4– concentration. The model of the solvent extraction process used accounts – apart from uranyl complexation by TODGA and SO3-Ph-BTP4– – also for uranyl complexation by nitrates and for the decrease in the concentration of the free L4– ligand in the aqueous phase, due to its protonation, bonding in the uranyl complex and the distribution between the two liquid phases. The unusually strong dependence of the D values on the acidity, found in the experiment, could hardly be explained as due to L4– protonation merely. Three hypotheses were experimentally tested, striving to interpret the data in terms of additional extraction to the organic phase of ion associates of protonated TODGA cation with either partly protonated anionic L4– ligands or anionic UO2 2+ complexes with NO3 – or L4–. None of them has been confi rmed. The analysis of the results, based on the formal correction of free ligand concentrations, points to the formation of 1 : 1 and 1 : 2 uranyl – SO3-Ph-BTP complexes in the aqueous phase. The conditional formation constant of the 1:1 complex has been determined, logβL,1 = 2.95 ± 0.15.
    Źródło:
    Nukleonika; 2015, 60, No. 4, part 2; 821-827
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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