Synthesis and characterization of functionalized silica-based nanohybrid materials for oxyanions adsorption

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dc.contributor.authorKaratchevtseva, Ien_AU
dc.contributor.authorAstoux, Men_AU
dc.contributor.authorCassidy, DJen_AU
dc.contributor.authorYee, Pen_AU
dc.contributor.authorBartlett, JRen_AU
dc.contributor.authorGriffith, CSen_AU
dc.date.accessioned2010-07-05T05:40:49Zen_AU
dc.date.available2010-07-05T05:40:49Zen_AU
dc.date.issued2010-06-01en_AU
dc.date.statistics2010-06-01en_AU
dc.description.abstractThis study investigates the structural evolution of a series of nanohybrid powders and coatings synthesized by direct co-condensation of amino-functionalized alkyltrialkoxysilanes and tetraalkoxysilanes with an aromatic carboxylic acid (trimesic acid, TMA) as a structure directing agent. Fourier transform infrared spectroscopy (FTIR) and 13C CP-MAS NMR results have suggested the formation of secondary (−CO−NH−) amide linkages upon interaction of TMA with the amino functionalized silane thus creating a “scaffold” around which the silica network is formed and also assisting in more homogeneous distribution of nitrogen sites within the nanohybrid structure. Functionalized silica powders were investigated for their potential to remove toxic oxyanions from mildly acidic or basic solutions. The uptake of Mo(VI), Se(VI), and Cr(VI) oxyanions was investigated as a function of the nanohybrid composition, oxyanion concentration, and solution pH using laser diffraction particle sizing, gas adsorption, and various spectroscopic techniques. The adsorption data obtained for Mo and Se could be adequately described by Langmuir adsorption isotherms, while the Freundlich isotherm is employed to fit the adsorption data for Cr. An easily accessible processing window (of pH, aging time, etc.) has been identified allowing production of continuous and uniform thin nanohybrid coatings on silicon and glass substrates. These coatings were tested as chemical barriers against Mo leaching from specially prepared Mo-doped glass. Leaching studies were conducted over 200 days in water at 90°C and the Mo leaching from coated and uncoated samples compared. © 2010, American Chemical Societyen_AU
dc.identifier.citationKaratchevtseva, I., Astoux, M., Cassidy, D. J., Yee, P., Bartlett, J. R., & Griffith, C. S. (2010). Synthesis and characterization of functionalized silica-based nanohybrid materials for oxyanions adsorption. Langmuir, 26(11), 8327-8335. doi:10.1021/la904747men_AU
dc.identifier.govdoc1857en_AU
dc.identifier.issn0743-7463en_AU
dc.identifier.issue11en_AU
dc.identifier.journaltitleLangmuiren_AU
dc.identifier.pagination8327-8335en_AU
dc.identifier.urihttp://dx.doi.org/10.1021/la904747men_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/1757en_AU
dc.identifier.volume26en_AU
dc.language.isoenen_AU
dc.publisherAmerican Chemical Societyen_AU
dc.subjectHybridizationen_AU
dc.subjectAdsorptionen_AU
dc.subjectMolecular sievesen_AU
dc.subjectSilicaen_AU
dc.subjectSpectroscopyen_AU
dc.subjectSynthesisen_AU
dc.titleSynthesis and characterization of functionalized silica-based nanohybrid materials for oxyanions adsorptionen_AU
dc.typeJournal Articleen_AU
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