Kinetic and Isothermal Study for Adsorption of Lanthanum on Modified Activated Carbon

In recent years, the separation and upgrading rare earth elements with an increased demand for these elements and their compounds is important. In this study, the adsorption of lanthanum from synthetic solution containing lanthanum is investigated using activated carbon developed from Dom peels that is activated by 10% HCl. Characterization techniques such as Fourier transform infrared (FTIR) spectroscopy and thermogravimetric analysis (TGA) were used to demonstrate the physical and chemical properties of the modified activated carbon. The batch absorption of La 3+ ion from simulated waste solutions using modified activated carbon was investigated. Equilibrium adsorption isotherms and kinetic studies were investigated. The experimental data were analyzed by the Langmuir and Freundlich models and the isotherm data fitted well to the Langmuir isotherm. The kinetic data obtained were analyzed using a pseudo-first order, pseudo-second order, and intra particle diffusion equations. The experimental data fitted very well the pseudo-second-order kinetic model.