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An aqueous route to organically functionalized silica diatom skeletons
Authors:Christabel E. Fowler,Catherine Buchber,Joë  l Patarin,Alain Walcarius
Affiliation:a Laboratoire de Matériaux à Porosité Contrôlée, CNRS UMR 7016, ENSCMu-UHA, 3 rue Alfred Werner, 68093 Mulhouse Cedex, France
b Laboratoire de Chimie Physique et Microbiologie pour l’Environnement, UMR 7564, CNRS, Nancy-Université, 405, rue de Vandoeuvre, 54600 Villers-Les-Nancy, France
Abstract:
Diatomaceous earth was functionalized by grafting organotrialkoxysilane precursors onto the surface of the porous silica cell walls of this biomineral. Vinyl- and mercapto-containing structures were prepared in aqueous media without disruption of the diatomic architecture. Successful grafting of the organic moieties was confirmed using solid state 29Si MAS NMR spectroscopy, and the presence of the intact diatom framework by scanning electron microscopy. The sorption properties of mercaptopropyl-functionalized diatoms towards heavy metals was studied by measuring the accessibility and diffusion rates of mercury(II) species to the binding sites (-SH) by the means of electrochemical methods.
Keywords:Diatom   Functionalization   Grafting   Metal uptake
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