Journal
CHEMICAL ENGINEERING JOURNAL
Volume 150, Issue 1, Pages 188-195Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2008.12.024
Keywords
Ni(II); Sorption; Attapulgite; pH; Humic substances; Temperature
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Funding
- National Natural Science Foundation of China [J0630962, 20871062, 20501019]
- 973 Project [2007CB936602]
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Sorption of Ni(II) on Na-attapulgite as a function of pH and ionic strength is investigated under ambient conditions. The results indicate that sorption of Ni(II) is strongly dependent on ionic strength at pH < 8, and independent of ionic strength at pH > 8. Results of the desorption tests of Ni(II) from bare and HA bound attapulgite hybrids indicate that the sorption is reversible at pH 6.0. Outer-sphere complexation or ion exchange may be the main sorption mechanism of Ni(II) to attapulgite at pH < 8, whereas the uptake of Ni(II) at pH > 8 is mainly dominated by inner-sphere complexation. The presence of FA and HA decreases Ni(II) sorption to FA/HA-attapulgite hybrids at pH > 7 obviously, and the influence at pH < 7 is weakly. Sorption of Ni(II) to Na-attapulgite increases with increasing temperature. The thermodynamic data (Delta H degrees, Delta S degrees, Delta G degrees) are calculated from the temperature-dependent sorption isotherms, and the results suggest that sorption process of Ni(II) on attapulgite is spontaneous and endothermic. (C) 2008 Elsevier B.V. All rights reserved.
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