Static and dynamic studies of lanthanum(III) ion adsorption/desorption from acidic solutions using chelating ion exchangers with different functionalities.

Static and dynamic studies of lanthanum(III) ion adsorption/desorption from acidic solutions using chelating ion exchangers with different functionalities. Environ Res. 2020 Sep 10;:110171 Authors: Kołodyńska D, Fila D, Hubicki Z Abstract Increasing the number of applications of rare earth elements (REEs) has led to increased release of these metals into the environment. Removal of REEs from e-wastes is very important considering the increasing demand for these elements, the limited resource availability of them as well as the significant environmental issues. In this present study, optimization of the La(III) ions sorption from acidic solutions on chelating ion exchangers containing different functional groups, i.e. Amberlite IRC748, Purolite S930, Lewatit® Monoplus TP208, Amberlite IRC747, Purolite S940, and Purolite S950, was carried out. The sorption data was analyzed using the Lagergren pseudo-first order, Ho and McKay pseudo-second order, Weber-Morris intraparticle diffusion, Boyd kinetic models, pore and film diffusion coefficients as well as the Langmuir, Freundlich, and Temkin isotherm models. Additionally, thermodynamic parameters and regeneration abilities of chelating ion exchangers were evaluated. The maximum recovery of La(III) ions was found for HNO3 concentration equal to 0.2 mol/dm3. The La(III) ions sorption was fast and sorption equilibrium was achieved after about 60 minutes. The best fitting for the lanthanum(...
Source: Environmental Research - Category: Environmental Health Authors: Tags: Environ Res Source Type: research