Abstract
Highly efficient recovery of uranium from seawater is essential for the enormous global demand of nuclear fuel in the future. In this study a new Semi-Interpenetrating Polymer Network Alg/PAO (Semi-IPN Alg/PAO) hydrogel microspheres adsorbent (Abbreviated as Alg/PAO) was prepared by self-assembly method. This material has high uranium adsorption capacity (186.6 mg/g at room temperature), high adsorption selectivity, easy to manufacture on large-scale, facile to handle and collect in practical situations, which are essential for practical applications in the recovery of U(VI) from seawater. The effects of solid-liquid ratio, ionic strength, contact time, pH, initial concentration and temperature on the adsorption of uranium by Alg/PAO hydrogel microspheres were investigated by batch experiments. The U(VI) adsorption on Alg/PAO hydrogel microspheres fitted well to the pseudo second-order kinetic model and Langmuir model. FTIR and XPS and DFT (Density Functional Theory) simulations indicate that the uranyl ion mainly form chelates with amidoxime groups and carboxyl groups on sodium alginate with uranium.
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