Uranyl ions adsorption by novel metal hydroxides loaded Amberlite IR120

In this work, Ni(OH)(2)-loaded Amberlite IR120 (Ni MA) and Co(OH)(2)-loaded Amberlite IR120 (Co MA) resins were prepared, characterized and applied for UO22+ removal from aqueous solutions. The adsorption characteristics were investigated in a batch system with respect to effect of contact time, pH, equilibrium isotherms and removal kinetics data. The results indicated that the LO22+ could be efficiently removed from aqueous solutions at pH = 3.5 using Ni MA and Co MA resins. The maximum adsorption capacities for the UO22+ of Ni MA and Co MA were found to be 439 mg/g and 451 mg/g respectively. The equilibrium data fit well with the Langmuir adsorption isotherm. Kinetics study showed that the adsorption process was fast and reached equilibrium within 60 min and the kinetics data fit well with pseudo-second order and intra-particle diffusion models for both resins. The adsorption mechanism has been proposed and discussed. It was found that both Ni MA and Co MA resins could be used effectively for UO22+ removal from aqueous solutions. (C) 2014 Elsevier Ltd. All rights reserved.