Adsorption properties of lignin containing bentonite-polyacrylamide composite for UO22+ ions
As a new material, a composite of polyacrylamide (PAA)-Bentonite (B) containing Lignin (L) was synthesized and adsorption properties of this new material was studied for the removal of uranyl ions from solution. The material was characterized by Fourier transform infrared spectroscopy, scanning electron microscopy, X-ray diffraction, and PZC analysis. The effects of experimental variables such as concentration, pH, ionic strength, temperature, and kinetic of adsorption were investigated. The adsorption data were analyzed using the Langmuir, Freundlich, Temkin, and Dubinin-Radushkevich (DR) equations. The adsorption process is evaluated with pseudo-first-order, pseudo-second-order, Elovich, and intraparticle diffusion models. The Q(L) (molkg(-1)) and K-L (L mol(-1)) values for adsorption from solution were 0.314 and 1,321 for PAA-B-L. This investigation showed that the new developed material can be used for the removal of UO22+ ions from aquatic solutions.