Kinetics, isotherms, and thermodynamic modeling of light lanthanides(III): La(III) and Gd(III) using Mn–Ni nanoparticles

The sorption of light lanthanides, La(III) and Gd(III) on Mn–Ni nanoparticle was studied at varying ions concentrations, pH, contact time and temperatures. The kinetics of sorption of La(III) and Gd(III) were investigated, the experimental data were analyzed using the pseudo-first-order, pseudo-second-order forms, Elovich, and intra-particle diffusion models. The sorption kinetics of investigated ions was described by pseudo-second-order model. The experimental isotherms data were analyzed using Freundlich, Langmuir, and Temkin models were used to analyze the sorption isotherm data of ion exchange of La(III) and Gd(III) on Mn–Ni nanoparticle. The best fit was obtained by the Langmuir model with high correlation coefficients (R2 = 0.995) with a maximum monolayer adsorption capacity of 8.81 mg/g. KEY WORDS: Sorption isotherm, Kinetics models, Mn–Ni nano particle Bull. Chem. Soc. Ethiop. 2024, 38(1), 255-267. DOI: https://dx.doi.org/10.4314/bcse.v38i1.19