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The sorption of UO 2 2+ from aqueous solution on attapulgite was investigated as a function of contact time, solid content, pH, ionic strength, foreign ions, humic acid (HA), and fulvic acid (FA) under ambient conditions by using batch technique. The attapulgite sample was characterized by XRD and FTIR in detail. The results indicated that the sorption of UO 2 2+ was strongly dependent on pH and ionic strength. The sorption of UO 2 2+ on attapulgite increased quickly with rising pH at pH < 6.5, and decreased with increasing pH at pH > 6.5. The presence of HA or FA enhanced the sorption of UO 2 2+ on attapulgite obviously at low pH because of the strong complexation of surface adsorbed HA/FA with UO 2 2+ on attapulgite surface. Sorption of UO 2 2+ on attapulgite was mainly dominated by ion-exchange or outer-sphere surface complexation at low pH values, but by inner-sphere surface complexation at high pH values. The results indicate that attapulgite is a very suitable adsorbent for the preconcentration and solidification of UO 2 2+ from large volumes of aqueous solutions because of its negative surface charge and large surface areas.
Journal of Radioanalytical and Nuclear Chemistry – Springer Journals
Published: Jun 1, 2012
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