THERMOCHEMICAL CHARACTERISTICS OF THE PROCESS OF ADSORPTION OF COBALT IONS PHOSPHATE CATION EXCHANGER CFP-12
Microcalorimeter method investigated thermokinetic process of sorption of cobalt ions in the phosphate cation exchanger. It is established that the intensity of the heat of sorption of ions over time is dramatically reduced. Defined heat of sorption of cobalt on the degree of filling of the cation. Change the sign of the thermal effect confirms that the initial adsorption is accompanied by the coordination interaction of ions with functional groups. Examined the relationship of the thermal effect of the process over time, the sorption of cobalt ions determined that thermoprocessed in the system after reaching the sorption equilibrium. By the method of differential thermal calorimetry performed direct determination of the enthalpy of adsorption of cobalt ions. The effect on the magnitude of the thermal effect of the energy of formation of secondary products HF, СоF+, CoF2, [CoF3]–, [CoF4]2–,. In the process of adsorption of cobalt ions is the inverse of the total thermal effect of the degree of filling, the values are respectively equal to 4,7; 2,8; 1,2; 0,9; – 0,6 kJ/mol.