Effect of pH, ionic strength and humic acid on the sorption of uranium(VI) to attapulgite. Applied radiation and isotopes : including data, instrumentation and methods for use in agriculture, industry and medicine [Appl Radiat Isot] Journal article | | Title | Effect of pH, ionic strength and humic acid on the sorption of uranium(VI) to attapulgite. | | Author(s) | Niu Z, Fan Q, Wang W, Xu J, Chen L, Wu W | | Institution | Radiochemistry Laboratory, Lanzhou University, Lanzhou 730000, Gansu, China. | | Source | Appl Radiat Isot 2009 Apr 9. | | Abstract | Attapulgite was investigated to remove UO(2)(2+) 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 UO(2)(2+) on attapulgite was strongly dependent on pH values and ionic strength. The presence of humic acid enhanced the sorption of UO(2)(2+) on attapulgite obviously because of the strong complexation of humic acid (HA) with UO(2)(2+) on attapulgite surface. Sorption of UO(2)(2+) 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 UO(2)(2+) from large volume of solutions because of its negative surface charge and large surface areas. | | Language | ENG | | Pub Type(s) | JOURNAL ARTICLE
| | PubMed ID | 19427225 |
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