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Impact of environmental conditions on the sorption behavior of UO 2 2+ onto attapulgite studied by batch experiments

Impact of environmental conditions on the sorption behavior of UO 2 2+ onto attapulgite studied... 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. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Radioanalytical and Nuclear Chemistry Springer Journals

Impact of environmental conditions on the sorption behavior of UO 2 2+ onto attapulgite studied by batch experiments

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References (74)

Publisher
Springer Journals
Copyright
Copyright © 2012 by Akadémiai Kiadó, Budapest, Hungary
Subject
Chemistry; Inorganic Chemistry; Physical Chemistry; Nuclear Physics, Heavy Ions, Hadrons; Nuclear Chemistry; Diagnostic Radiology
ISSN
0236-5731
eISSN
1588-2780
DOI
10.1007/s10967-012-1666-5
Publisher site
See Article on Publisher Site

Abstract

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

Journal of Radioanalytical and Nuclear ChemistrySpringer Journals

Published: Jun 1, 2012

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