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Chinese Physics C> 2005, Vol. 29> Issue(S1) : 84-88 

XANES Study of Hg Sorption Products on Montmorillonite at High Temperatures

  •  Deparment of Physics,University of Science and Technology of China,Hefei 230026,China2 Beijing Synchrotron Radiation Facility,Institute of High Energy Physics,CAS,Beijing 100049,China3 Dipartimento di Scienze della Terra,Universita di Modena e Reggio Emilia,L.go S. Eufemia 19,Italy4 INFN-Laboratori Nazionali di Frascati,P.O.Box 13,00044 Frascati,Italy

  • The Hg L3-edge XANES spectra of montmorillonite treated with Hg(NO3)2 0.01M aqueous solution and the mixing solution of Hg(NO3)20.01M aqueous solution and cysteine 0.01M aqueous solution have been measured at several high temperatures. The adsorption and desorption of mercury in Hg-rich montmorillonite minerals and the effect of cysteine on the adsorption of mercury by this clay mineral were studied. Our analysis shows that mercury is six fold coordinated by water molecules and the oxygen atoms of montmorillonite surface without the amino acid introduction. Mercury atoms prefer to bond with sulphur atoms of the amino acid cysteine to form more stable Hg-S bonds when the amino acid cysteine has been introduced. This result suggests that the treatment with the amino acid enhances the stability of mercury sorbed by the montmorillonite mineral and efficiently retard the release of mercury ions into the geosphere.
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    [1] . Hudson R J M et al. Water Air Soil Pollution, 1995, 80:2652. Wagemann R et al. Sci. Total Environ., 1998, 218: 193. Collins C R, Sherman D M, Ragnardottir K V. Journal ofColloid and Interface Science, 1999, 219: 3454. Gagnon C et al. Marine Chemistry, 1997, 59: 1585. Benincasa E et al. Clay Minerals, 2000, 35: 6456. Benincasa E et al. Applied Clay Science, 2002, 21: 1917. Cardelli A et al. Phys. Chem. Miner, 2003, 30: 548. Olphen H van, Fripiat J J. Data Handbook for Clay Ma-terials and other Non-metallic Minerals, 1979, PergamonPress, Oxford, 3439. WU Zi-Yu, Saini N L, Bianconi A. Phys. Rev., 2001, B64:09250710. WU Zi-Yu et al. Phys. Rev., 1997, B55: 257011. WU Zi-Yu et al. Phys. Rev., 1999, B60: 9216

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CHU Wang-Sheng, WU Zi-Yu and LIU Wen-Han. XANES Study of Hg Sorption Products on Montmorillonite at High Temperatures[J]. Chinese Physics C, 2005, 29(S1): 84-88.
CHU Wang-Sheng, WU Zi-Yu and LIU Wen-Han. XANES Study of Hg Sorption Products on Montmorillonite at High Temperatures[J]. Chinese Physics C, 2005, 29(S1): 84-88. shu
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Received: 2005-10-28
Revised: 1900-01-01
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XANES Study of Hg Sorption Products on Montmorillonite at High Temperatures

    Corresponding author: WU Zi-Yu,
  • Deparment of Physics,University of Science and Technology of China,Hefei 230026,China2 Beijing Synchrotron Radiation Facility,Institute of High Energy Physics,CAS,Beijing 100049,China3 Dipartimento di Scienze della Terra,Universita di Modena e Reggio Emilia,L.go S. Eufemia 19,Italy4 INFN-Laboratori Nazionali di Frascati,P.O.Box 13,00044 Frascati,Italy
  • Received Date: 2005-10-28
  • Accepted Date: 1900-01-01
  • Available Online: 2005-01-02

Abstract: The Hg L3-edge XANES spectra of montmorillonite treated with Hg(NO3)2 0.01M aqueous solution and the mixing solution of Hg(NO3)20.01M aqueous solution and cysteine 0.01M aqueous solution have been measured at several high temperatures. The adsorption and desorption of mercury in Hg-rich montmorillonite minerals and the effect of cysteine on the adsorption of mercury by this clay mineral were studied. Our analysis shows that mercury is six fold coordinated by water molecules and the oxygen atoms of montmorillonite surface without the amino acid introduction. Mercury atoms prefer to bond with sulphur atoms of the amino acid cysteine to form more stable Hg-S bonds when the amino acid cysteine has been introduced. This result suggests that the treatment with the amino acid enhances the stability of mercury sorbed by the montmorillonite mineral and efficiently retard the release of mercury ions into the geosphere.

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