Employment of Co(II)–Fe(III) layered double hydroxide as magnetic adsorbent for rapid recovery of molybdenum-99

Abstract

Co(II)–Fe(III) Layered double hydroxide (LDH) was prepared by co-precipitation methods for recovery of 99Mo(VI) from aqueous solutions. The data showed that 99Mo(VI) anions are efficiently adsorbed (R% ˃ 98), in the pH range 2.5–11. The kinetic data showed that about 82% of 99Mo(VI) are adsorbed onto the synthesized LDH in the first ten minutes, while the equilibrium is attained at 120 min. The thermodynamic parameters (ΔG°, ΔH° and ΔS°) are estimated in the temperature range 20–50 °C. The effect of different foreign anions, (Cl−, SO42−, CO32−and NO−3) at various concentrations is evaluated. The synthesized adsorbent showed maximum adsorption capacity of 255.175 mg g−1 for 99Mo(VI) at pH = 3.5, which is mostly higher than those reported in literature.