Utilization of modified polymeric composite supported crown ether for selective sorption and separation of various beta emitting radionuclides in simulated waste

Theoretically, crown ethers are expected to contribute to the formation of a host-guest composition with a polymer backbone and improve its disadvantages. Based on this hypothesis, preparation of the modified multi-functional polymeric composite was carried out by mini emulsion -irradiation of Poly Sodium styrene sulphonate (Acrylonitrile-Di amino benzo 18-crown-6) PSS (AN-DAB18C6) in the presence of N, N'-methylenediacrylamide (DAM) as a crosslinker and sodium styrene sulphonate as a-surfactant and high-share ultrasonic. The main role of the prepared adsorbent is to modify both the inert crown ether-based and shared monomer into more reactive forms. The influences of synthesis conditions, particularly filler concentration and radiation dose, were examined. The chemical modification reaction was carried out using hydroxylamine hydrochloride to get the amidoxime function group (AO) within the modification of the acrylonitrile (AN) system. The characterization of the composites by SEM, FTIR, and DLS confirmed that the modified polymeric composites exhibit good transformation. The sorption of La3+, Gd3+, Y3+ and Sr2+ ions in aqueous solution on PSS (AN-DAB18C6) and PSS (AO-DAB18C6) composite sorbents was investigated by the batch method. The results showed the higher selectivity of the PSS (AO-DAB18C6) composite towards La3+ and Y3+ ions more than that of Gd3+ and Sr(2+)ions with the maximum sorption capacity of 63, 52, 25, and 24 mg/g, respectively. The experimental data fitted well to pseudo-second-order, elovich kinetic modeling and also fitted well to the Langmuir isotherms. (C) 2022 Elsevier B.V. All rights reserved.

Automated summary

The modified multi-functional polymeric composite was prepared by incorporating a crosslinker and a surfactant into sodium styrene sulphonate and subjecting it to radiation. The composites exhibited good transformation, as confirmed by SEM, FTIR, and DLS analysis. Batch experiments showed that the composite sorbents demonstrated higher selectivity towards La3+ and Y3+ ions compared to Gd3+ and Sr2+ ions.