Akademik Veri Yönetim Sistemi
Polymer Bulletin, cilt.81, sa.1, ss.1019-1042, 2024 (SCI-Expanded)
In the present study, anionic hydrogels, acrylamide (AAm) monomer, and 2-acrylamido-2-methyl-1-propanesulfonic acid (AMPSA) comonomer were prepared in the presence of two different cross-linkers. Then, super-anionic hydrogels were prepared by converting the amide groups of neutral AAm in anionic hydrogels to hydroxamic acid with hydroxylamine hydrochloride. The hydrogels were characterized by FTIR, SEM, TG, and DSC analyses. Uranyl adsorption in the hydrogels was investigated by spectroscopic, kinetic, and equilibrium studies. It was determined that uranyl adsorption kinetics in hydrogels were compatible with pseudo-second-order and intra-particular diffusion models. It was determined that the uranyl adsorption isotherms on the hydrogels were L-type according to the Giles isotherm classification. Adsorption parameters were calculated by applying Freundlich and Langmuir models to these isotherms. In addition, it was determined that the amount of adsorbed uranyl increased with the increase in adsorbent mass, did not change with temperature, decreased in the range of pH 2–4, and increased at pH 4–7. It was observed that super-anionic hydrogels had the highest adsorption capacity among these new hydrogels. In addition, molecular electrostatic potential (MEP) mapping was performed to predict the reactive regions of the hydrogels. The results showed that the theoretical and experimental data of hydrogels are in agreement with each other. In conclusion, it can be said that the anionic and super-anionic hydrogels prepared in this study are unique hydrogels with fast and effective properties in removing uranyl.