1999 | OriginalPaper | Chapter
Hg2+ Trapping by Thiol – Functionalised Mesoporous Silica Molecular Sieves
Authors : L. Mercier, T. J. Pinnavaia
Published in: Natural Microporous Materials in Environmental Technology
Publisher: Springer Netherlands
Included in: Professional Book Archive
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The covalent grafting of 3-mercaptopropylsilyl groups to the framework pore walls of mesoporous silica molecular sieves represents a promising new approach for trapping of Hg2+ and other heavy metals from dilute solution. Two framework structures were examined, namely, a calcined hexagonal silica prepared by electrostatic supramolecular assembly, and an uncalcined wormhole -like silica obtained through neutral surfactant assembly. Owing to the presence of a higher concentration of surface hydroxyl groups, the wormhole silica was far more effective for thiol fuctionalisation and heavy metal ion trapping.