XANES Study of Hg Sorption Products on Montmorillonite at High Temperatures

CHU Wang-Sheng; WU Zi-Yu; LIU Wen-Han

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

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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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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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沈阳化工大学材料科学与工程学院沈阳 110142

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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