Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10730494 | Applied Radiation and Isotopes | 2009 | 9 Pages |
Abstract
Attapulgite was investigated to remove UO22+ from aqueous solutions because of its strong sorption capacity. Herein, the attapulgite sample was characterized by Fourier transform infrared spectra (FTIR), X-ray diffraction (XRD) and acid-base titration in detail. Sorption of UO22+ on attapulgite was strongly dependent on pH values and ionic strength. The presence of humic acid enhanced the sorption of UO22+ on attapulgite obviously because of the strong complexation of humic acid (HA) with UO22+ on attapulgite surface. Sorption of UO22+ on attapulgite was mainly dominated by ion-exchange or outer-sphere complexation at low pH values, and by inner-sphere complexation at high pH values. The results indicated that attapulgite was a suitable material for the preconcentration and solidification of UO22+ from large volume of solutions because of its negative surface charge and large surface areas.
Keywords
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Radiation
Authors
Niu Zhiwei, Fan Qiaohui, Wang Wenhua, Xu Junzheng, Chen Lei, Wu Wangsuo,