Adsorption behavior and mechanism of D113 resin for lanthanum

The sorption properties of macroporous weak acid resin (D113) for La3+ ion were studied by chemical analysis and IR spectra. Experimental results indicate that the D113 resin has a good adsorption ability for La3+ at pH = 6.0 in the HAc-NaAc medium. The statically saturated adsorption capacity is 273.3 mg/g. Separation coefficients of βLa3+/Ce3+, βLa3+/Gd3+, βLa3+/Er3+, and βLa3+/Y3+ are 2.29, 3.64, 4.27, and 0.627, respectively. The apparent activation energy of adsorption, Ea 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 La3+ obeys the Freundlich isotherm. La3+ adsorbed on resin can be eluted by 2.0 mol/LHCl quantitatively.