چكيده به لاتين
In the conducted research, strong anionic magnetic resins were synthesized for the first time inside the country and used as uranium adsorbents from aqueous solution. In this regard, first, magnetite nanoparticles coated with oleic acid were synthesized, which were used in the next steps to produce strong anionic magnetic resins. To produce strong anionic magnetic resins, in the first step, styrene-divinylbenzene copolymer particles were produced by suspension polymerization method, and by adding synthesized magnetite nanoparticles, they became magnetic. The produced spherical particles were chlorinated in the second step under the chloromethylation process. In the last step, the chloromethylated particles were converted into strong anion exchange magnetic resins by using the amination process with trimethylamine solution. The synthesized resins were characterized by a wide range of analytical techniques such as XRD, VSM, FT-IR, SEM, BET, EDX. In the following, the effect of various factors such as pH, contact time, amount of adsorbent, initial concentration of uranium, temperature in the process of uranium adsorption by synthesized magnetic resins were investigated and the optimal conditions were determined. The adsorption efficiency of synthetic resins in optimal conditions was calculated to be 89%. Kinetic and isotherm studies showed that the adsorption process follows pseudo-second order models and Freundlich isotherm. Also, thermodynamic studies show that the adsorption process of the adsorbent is a spontaneous and endothermic process and is performed better at a higher temperature. Uranium desorption from resins was investigated with different types of solutions, and nitric acid, with 80% desorption, was chosen as the best desorption solution.
