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Sorption of Eu(III) on Attapulgite Studied by Batch, XPS and EXAFS Techniques.

Abstract : The effects of pH, ionic strength and temperature on sorption of Eu(III) on attapulgite were investigated in the presence and absence of fulvic acid (FA) and humic acid (HA). The results indicated that the sorption of Eu(III) on attapulgite was strongly dependent on pH and ionic strength, and independent of temperature. In the presence of FA/HA, Eu(III) sorption was enhanced at pH < 4, decreased at pH range of 4 - 6, and then increased again at pH > 7. The X-ray photoelectron spectroscopy (XPS) analysis suggested that the sorption of Eu(III) might be expressed as ≡X3Eu0 ≡SwOHEu3+ and ≡SOEu-OOC-/HA in the ternary Eu/HA/attapulgite system. The extended X-ray absorption fine structure (EXAFS) analysis of Eu-HA complexes indicated that the distances of d(Eu-O) decreased from 2.451 to 2.360 Å with increasing pH from 1.76 to 9.50, whereas the coordination number (N) decreased from ~9.94 to ~8.56. Different complexation species were also found for the different addition sequences of HA and Eu(III) to attapulgite suspension. The results are important to understand the influence of humic substances on Eu(III) behavior in the natural environment.
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http://hal.in2p3.fr/in2p3-00437715
Contributor : Marie Germain <>
Submitted on : Tuesday, December 1, 2009 - 11:54:11 AM
Last modification on : Wednesday, October 30, 2019 - 4:50:02 PM
Long-term archiving on: : Saturday, November 26, 2016 - 3:20:47 PM

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  • HAL Id : in2p3-00437715, version 1
  • ARXIV : 0912.0785

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Q.H. Fan, X.L. Tan, J.X. Li, X.K. Wang, W.S. Wu, et al.. Sorption of Eu(III) on Attapulgite Studied by Batch, XPS and EXAFS Techniques.. Environmental Science and Technology, American Chemical Society, 2009, 43, pp.5776-5782. ⟨in2p3-00437715⟩

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