Adsorption behavior and mechanism of D113 resin for lanthanum

Abstract The sorption properties of macroporous weak acid resin (D113) for La 3+ ion were studied by chemical analysis and IR spectra. Experimental results indicate that the D113 resin has a good adsorption ability for La 3+ at pH = 6.0 in the HAc-NaAc medium. The statically saturated adsorption capacity is 273.3 mg/g. Separation coefficients of β La 3+ /Ce 3+ , β La 3+ /Gd 3+ , β La 3+ /Er 3+ , and β La 3+ /Y 3+ are 2.29, 3.64, 4.27, and 0.627, respectively. The apparent activation energy of adsorption, E a is 18.4 kJ/mol, the thermodynamics parameters ΔH, ΔS, and ΔG of sorption are 4.53 kJ/mol, 61.8 J/(mol.K), −13.9 kJ/mol, respectively. The adsorption behavior of D113 for La 3+ obeys the Freundlich isotherm. La 3+ adsorbed on resin can be eluted by 2.0 mol/LHCl quantitatively.