Abstract
Recently, magnetic sorbents have received considerable attention because of their excellent segregative features and sorption capacities. Herein, attapulgite/iron oxide magnetic (ATP/IOM) composites were prepared and characterized. The sorption results indicated that ATP/IOM composites were superior to ATP and iron oxides individually for the removal of U(VI) from aqueous solution. Based on X-ray photoelectron spectroscopy (XPS) analysis and surface complexation model, the main sorption species of U(VI) on ATP were X 2UO 2 0 below pH 4.0 and S sOUO 2 +, S wOUO 2CO 3 −, and S wOUO 2(CO 3) 2 3− above pH 5.0. However the prevalent species on ATP/IOM composites were S sOUO 2 + and S wOUO 2(CO 3) 2 3− over the observed pH range. ATP/IOM composites are a promising candidate for pre-concentration and immobilization of radionuclides from large volumes of aqueous solutions, as required for remediation purposes.
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