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

I Karatchevtseva; M Astoux; D J Cassidy; P Yee; John R Bartlett; C S Griffith

doi:10.1021/la904747m

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

Journal article

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

I Karatchevtseva, M Astoux, D J Cassidy, P Yee, John R Bartlett and C S Griffith

Langmuir, Vol.26(11), pp.8327-8335

2010

DOI: https://doi.org/10.1021/la904747m

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Abstract

This 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

Details

Title: Synthesis and characterization of functionalized silica-based nanohybrid materials for oxyanions adsorption
Authors: I Karatchevtseva (Author) - Australian Nuclear Science and Technology Organisation Materials Division
M Astoux (Author) - Australian Nuclear Science and Technology Organisation Materials Division
D J Cassidy (Author) - Australian Nuclear Science and Technology Organisation Materials Division
P Yee (Author) - Australian Nuclear Science and Technology Organisation Materials Division
John R Bartlett (Author) - Australian Nuclear Science and Technology Organisation Materials Division
C S Griffith (Author) - Australian Nuclear Science and Technology Organisation Materials Division
Publication details: Langmuir, Vol.26(11), pp.8327-8335
Publisher: American Chemical Society
Date published: 2010
DOI: 10.1021/la904747m
ISSN: 0743-7463
Organisation Unit: School of Science and Engineering - Legacy; University of the Sunshine Coast, Queensland
Language: English
Record Identifier: 99449093102621
Output Type: Journal article

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Collaboration types: Domestic collaboration; International collaboration
Web Of Science research areas: Chemistry, Multidisciplinary; Chemistry, Physical; Materials Science, Multidisciplinary