Composite magnetic sorbents based on magnetic Fe3O4 coated by Zn and Al layered double hydroxide for U(VI) removal from aqueous media

AbstractComposite sorbents based on Fe3O4 and Zn-Al-LDH with different weight ratios of magnetic and sorbing phases were obtained by the precipitation method. The optimal weight ratio of Zn/Fe was 16, which resulted in a 62% increase in hydromechanical strength. The maximum sorption exchange capacity towards U(VI) was 268.65  ± 22.22 mg/g. The efficiency of U(VI) adsorption was not affected by the presence of Cl−, SO42 −, NO3− and Na+, Ca2+. The distribution coefficient in a groundwater model solution was Kd(U(VI)  = 0.5–3 × 105 mL/g. The materials possess high exchange capacity and selectivity, which makes them suitable sorbents for U(VI) removal.
Source: Journal of Radioanalytical and Nuclear Chemistry - Category: Nuclear Medicine Source Type: research