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Self-Assembled Monolayers of 12-Mercaptododecylphosphonic Acid on Titania Particles; Application to the Extraction of Heavy Metals

Published online by Cambridge University Press:  01 February 2011

Sébastien Anthérieu ,
Florence Brodard-Séverac ,
Gilles Guerrero  and
P. Hubert Mutin
Sébastien Anthérieu
Affiliation:
UMR CNRS 5637, Université Montpellier II, Place E. Bataillon 34095 Montpellier Cedex 5, France.
Florence Brodard-Séverac
Affiliation:
UMR CNRS 5637, Université Montpellier II, Place E. Bataillon 34095 Montpellier Cedex 5, France.
Gilles Guerrero
Affiliation:
UMR CNRS 5637, Université Montpellier II, Place E. Bataillon 34095 Montpellier Cedex 5, France.
P. Hubert Mutin
Affiliation:
UMR CNRS 5637, Université Montpellier II, Place E. Bataillon 34095 Montpellier Cedex 5, France.
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Abstract

Titania particles (P25 DEGUSSA AG) were treated by a solution of 12-mercaptododecyl-phosphonic acid (MDPA) in toluene to obtain an organic-inorganic hybrid material with thiol functions at the surface. This material was characterized by chemical analysis, solid state 31P MAS NMR and FTIR spectroscopies, and XPS. Reaction of the phosphonic acid end of MDPA with the TiO2 surface led to the formation of a relatively dense and well-ordered self-assembled monolayer (SAM), with a density of about 3.9 SH functions per nm2. This material was tested for the extraction of mercury in water at pH 7, 9, and 11. Chemical analysis indicated no loss of SH functionality, even at pH 11. The best extraction results were obtained at pH 9 and 11, with a metal extraction ability between 85 and 90%.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 847: Symposium EE – Organic/Inorganic Hybrid Materials , 2004 , EE13.29
Copyright
Copyright © Materials Research Society 2005

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