SCHEDULED MAINTENANCE
Effective removal of uranium from aqueous solution by using novel sustainable porous Al2O3 materials derived from different precursors of aluminum†
*ab
Abstract
Three kinds of porous Al2O3 materials have been prepared by using different precursors of aluminum via solution-freeze-drying-calcination technology. Meanwhile, the adsorption properties of Al2O3-Cl, Al2O3-N and Al2O3-S adsorbents to U(VI) were estimated and compared. The calculated maximum adsorption amount of porous Al2O3 materials at 298 K reached 805.72 mg g−1 for U(VI) (pH = 7.0), which was much higher than that of most of the other metal oxides. Moreover, it is worth mentioning that the remarkable adsorption efficiency was above 90% even after five cycles and the adsorption efficiency was relatively high in the solution with different coexisting ions. Crucially, U(VI) was almost adsorbed completely on Al2O3-Cl at the low concentration and only about 0.006 mg L−1 remained in the solution, which was below the permissible limits of the USEPA (0.03 mg L−1) and WHO (0.015 mg L−1). Based on the above results, it could be demonstrated that the novel porous Al2O3 materials had broad application prospects for U(VI) removal.
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