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

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 (& UDelta;G & DEG;, & UDelta;H & DEG; and & UDelta;S & DEG;) are estimated in the temperature range 20-50 & DEG;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.

Automated summary

Co(II)-Fe(III) layered double hydroxide (LDH) was synthesized and shown to efficiently adsorb 99Mo(VI) anions from aqueous solutions with a recovery rate of over 98%. The synthesized LDH reached equilibrium adsorption within 120 minutes, with about 82% of the 99Mo(VI) adsorbed in the first ten minutes. Thermodynamic parameters were estimated and the effect of different foreign anions at various concentrations was evaluated. The maximum adsorption capacity for 99Mo(VI) was found to be 255.175 mg g-1 at pH 3.5, surpassing previous literature reports.