| Abstrakt: |
According to the data of static method of sorption of trace amounts of Co(II) ions by the Termoksid-35 (T-35) sorbent in a chloride-acetate solution, the cobalt distribution coefficient Kd was calculated as a function of pH, concentration of humic acids (HA), and temperature. The distribution of the complexes Co2+, CoAc+, CoCl+, Co(OH)+, Co(OH)02, Co(OH)3– between the solution and the sorbent was modeled within the framework of the surface complexation concept. The found stability constants of the Co(OH)+ and Co(OH)20 complexes coincide with the thermodynamic values. In the presence of HA (10.0 mg/L), the best agreement between the model function of Kd–pH and the experimental data corresponds to the sorption of a complex with the composition Co(OH)A0, where A– is the anion of humic acids. It was concluded that T-35 can be used as a sorbent for removal of Co(II) radionuclides from industrial process at pH > 7 and natural water in the presence of humic acids. [ABSTRACT FROM AUTHOR] |
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