期刊
APPLIED SURFACE SCIENCE
卷 253, 期 12, 页码 5485-5493出版社
ELSEVIER
DOI: 10.1016/j.apsusc.2006.12.093
关键词
diatom; functionalization; grafting; metal uptake
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 Si-29 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. (C) 2007 Elsevier B.V. All rights reserved.
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