Adsorption properties of amine modified lignin-hydrogel composite for uranyl ions: Theoretical and experimental insights |
| |
Institution: | 1. Sivas Cumhuriyet University, Faculty of Sciences, Dept. of Chemistry, Sivas, Turkey;2. National Centre of Excellence in Analytical Chemistry, University of Sindh, Jamshoro, Pakistan |
| |
Abstract: | A new modified material was synthesized and characterized as ethylene diamine modified (EA) Polyacrylamide (PAA)-Lignin (L). The adsorption features of EA modified PAA-L were studied for uranyl ions. The characterization experiments were evaluated by FT-IR spectroscopic techniques, scanning electron microscopy (SEM), and PZC analysis. Adsorption of UO22+ ions as a function of concentration, pH, temperature, and time of adsorption were studied. The adsorption phenomenon of UO22+ ions onto PAA-L-EA from aqueous medium was successfully evaluated by various equilibrium models such as Langmuir, Freundlich, and Dubinin-Radushkevich (DR). The (Qe) maximum adsorption capacity values for Langmuir model was calculated as 0.792 kg mol?1 by using experimental data. The constant values of thermodynamic parameters such as (ΔG°), (ΔH°) and (ΔS°) were calculated and it has observed that the mechanism of adsorption was found compatible with endothermic and spontaneous owing to increasing disorderliness at solution/solid system. The adsorption mechanism is compatible with Elovich and intraparticle diffusion models. The power of the interaction between modified lignin and uranyl ?on was explained in the light of Hard and Soft Acid-Base Principle. |
| |
Keywords: | Lignin Uranyl Adsorption Amine HSAB |
本文献已被 ScienceDirect 等数据库收录! |
|