Abstract
Polydopamine/hydrous zirconium oxide (PDA/ZO) was developed by mixing polydopamine and hydrous zirconium oxide at room temperature. The material was characterized by FTIR, XRD, SEM, TEM and thermal analysis. The effects of solution pH, contact time, mass of adsorbent and initial concentration and their interactions on the adsorption efficiency were examined using response surface methodology via central composite design. Adsorption capacity of PDA/ZO for uranium(VI) was 100.56 mg g−1 under the optimized adsorption process. Equilibrium data were described well by Freundlich isotherm model. The kinetic data were well fitted with the pseudo- second- order kinetic model. The values of ΔG°, ΔH° and ΔS° revealed the endothermic and spontaneous nature of the uptake of U(VI) on PDA/ZO. The results demonstrated that the synthesized material could be useful as an effective sorbent for uptake of U(VI).
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