Abstract: This study aims to investigate lanthanum(III) removal onto Lewatit TP 214 resin containing thiourea
group in polystyrene- divinylbenzene matrix, in batch process. The effects of parameters such as the
concentration, pH level, contact time, ionic strength and temperature were investigated. The results showed
remarkable affinity of resin towards lanthanium(III) cations. The maximum uptake values of Ln(III) was 38.46
mg/g. Percentage removal increases with increasing initial pH solution, lanthanium(III) cations removal was
better in initial pH values of 5.20, at room temperature. The uptake kinetic for lanthanium(III) onto Lewatit TP
214 was best described by the pseudo second order model. The Langmuir isotherm fit well obtained equilibrium
data compared to the Freundlich isotherm. The thermodynamic data for lanthanium(III) cations sorption onto
Lewatit 214 resin, indicate that the process endothermic (ΔH = + 5.72 KJ.mol-1). In addition, the
thermodynamic study showed also negative ΔG values, indicating that the sorption process of lanthanium(III) is
spontaneous.
Keywords: lanthanum (III) removal, Lewatit TP 214 resin, kinetics, thermodynamics.thesis, Characterization, Dithiocarbamate metal complexes, 4-Amino-1,2,4-trioazole, 2-Amino 4-hydroxy-6-methyl pyrimidine.
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