Separation and Speciation of Ruthenium from Nitrate Medium by Ira-410 Anion Exchangers Kinetic, Thermodynamics and Reaction Mechanism
نویسنده
چکیده
The kinetics of exchange of Ru(III) at extremely low concentration on the strongly basic anion exchanger IRA-410 has been studied by means of finite volume method. The rate of exchange of Ru(III) studied as function of different parameters, the concentration, the particle size of the exchanger and temperature. The apparent activation energy obtained is 48.75±0.07 and 16.8 kJmol for IRA-410. The 1 adsorption of ruthenium goes through a chemical reaction mechanism IRA-410 and a particle diffusion mechanism in the case of macroreticular resin. The free energy of activation and the entropy of activation were found to be, -17.71Kjmol and 143.40 Jkmol respectively. In order to understand the exchange behavior of 1 1 IRA-410, The distribution coefficient was studied as a function of pH and temperature. The equilibrium study of Ru(III) ions with the two exchangers has been studied at 25, 35, 45, 55 and 65°C. The extraction of Ru(III)depends strongly on the change of pH rather than on the temperature.
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