THE ADSORPTION THERMODYNAMICS AND KINETICS OF 2-AMINOPYRIDINE IN AQUEOUS SOLUTION ONTO ADSORPTION RESINS MODIFIED BY o-AMINOPHENOL

Two kinds new hypercrosslinked polymeric resins modified by o-aminophenol(MOAR-1,MOAR-2) were synthesized,and the adsorption thermodynamics and kinetics of 2-aminopyridine in aqueous solution onto the new resins were studied.The results indicated that the Freundlich model gave a better fit to isotherm data.All the ΔH value was less than zero with an absolute value less than 60kJ/mol.The adsorption was an indicative of physical adsorption character and an easier desorption property.The negative value of ΔG indicated the spontaneous nature of the adsorption process,and the negative value of ΔS showed the 2-aminopyridine molecule movement was restricted on the solid interface.Kinetic results showed that on the adsorption behaviors of 2-aminopyridine on two kinds of new resins,the first-order rate equation was appropriate for describing the kinetic curve;the adsorption rate was enhanced with increasing of the temperature.The apparent activation energy was less than 4.0kJ/mol which indicated an easier adsorption property.