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Journal of Coordination Chemistry Volume 63, 2010 - Issue 5
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Original Articles

Preferential adsorption of mercury(II) ions in water: chelation of mercury, cadmium, and lead ions to silica derivatized with meso-2,3-dimercaptosuccinic acid

Amer Al Abdel Hamid Department of Chemistry, University of Maine, Orono, ME 04469, USA; Laboratory for Surface Science and Technology (LASST), University of Maine, Orono, ME 04469, USA
,
Carl P. Tripp Department of Chemistry, University of Maine, Orono, ME 04469, USA; Laboratory for Surface Science and Technology (LASST), University of Maine, Orono, ME 04469, USA
,
Alice E. Bruce Department of Chemistry, University of Maine, Orono, ME 04469, USA
&
Mitchell R.M. Bruce Department of Chemistry, University of Maine, Orono, ME 04469, USACorrespondence[email protected]
Pages 731-741 | Received 06 May 2009, Accepted 02 Nov 2009, Published online: 03 Mar 2010
 
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Abstract

Meso-dimercaptosuccinic acid (DMSA) covalently attached to silica gel via amide bond linkages (DMSA-[silica]) was evaluated as a chelate for Hg(II), Cd(II), and Pb(II). All three metal ions are separately chelated by DMSA-[silica]; 95% of Hg(II) is chelated, 81% of Cd(II), and 74% of Pb(II). When equal molar concentrations of the three metals are allowed to react simultaneously with DMSA-[silica] for 2 h, mercury is preferentially bound (99%) compared to cadmium (13%) or lead (0.4%). Attachment of DMSA to silica surfaces via amide bond formation, which increases the thiol to carboxylic acid ratio over free DMSA, is suggested as a factor in enhancing the preference of DMSA-[silica] for mercury.

Acknowledgment

We thank Professor Aria Amirbahman for his helpful discussions.

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