科研之友
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摘要
The study encompassed experimental mass spectrometric and theoretical quantum chemical studies on adsorption of uranium species in different oxidation states of the metal ion, and oxides of UxOyn+ type, where x = 1 or 3, y = 2 or 8, and n = 0,1 or 2 onto nanosize-particles of saltrock oxides MO (M = Mg-II, Ca-II, Ni-II, Co-II, Sr-II or Ba-II), M2Oy (M = Au-III or Ag-I, y = 3 or 1) silicates 3Al(2)O(3)center dot 2SiO(2), natural kaolinite (Al2O2 center dot 2SiO(2 center dot)2H(2)O), illite (K0.78Ca0.02Na0.02(Mg0.34Al1.69Fe0.02III)[Si3.35Al0.65]O-10(OH)(2)center dot nH(2)O), CaSiO3, 3MgO center dot 4SiO(2),H2O, and (MM2)-M-1(SiO4)X-2 (M-1 = M-2 = Al or M-1 = K, M-2 = Al, X = F or Cl), respectively. The UV-MALDI-Orbitrap mass spectrometry was utilized in solid-state and semi-liquid colloidal state, involving the laser ablation at lambda(ex) = 337.2 nm. The theoretical modeling and experimental design was based on chemical-, physico-chemical, physical and biological processes involving uranium species under environmental conditions. Therefore, the results reported are crucial for quality control and monitoring programs for assessment of radionuclide migration. They impact significantly the methodology for evaluation of human health risk from radioactive contamination. The study has importance for understanding the coordination and red-ox chemistry of uranium compounds as well. Due to the double nature of uranium between rare element and superconductivity like materials as well as variety of oxidation states is an element of (+1) (+6), the there remain challenging areas for theoretical and experimental research, which are of significant importance for management of nuclear fuel cycles and waste storage.
- 出版日期2014-9
