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6.5, because of the formation uranyl carbonate complexes (69 mg/g). The thermodynamic parameters (i.e., ΔH0, ΔS0 and ΔG0) indicated that the adsorption process of U(VI) on LDH was an endothermic and spontaneous process. At pH<6.5, the probable mechanism of adsorption of U(VI) was governed by inner-sphere surface complexation with OH groups on LDH surfaces, while the dominant mechanism at pH>6.5 was inner-sphere surface complexation and ion exchange with NO3¯. Based on the experimental results, LDH is a very suitable material for the removal of U(VI) ions from aqueous solutions in a wide range of pH. ]]>
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