Iron oxide silica derived from sol-gel synthesis

Darmawan, Adi, Smart, Simon, Julbe, Anne and Diniz da Costa, Joao Carlos (2011) Iron oxide silica derived from sol-gel synthesis. Materials, 4 2: 448-456. doi:10.3390/ma4020448


Author Darmawan, Adi
Smart, Simon
Julbe, Anne
Diniz da Costa, Joao Carlos
Title Iron oxide silica derived from sol-gel synthesis
Journal name Materials   Check publisher's open access policy
ISSN 1996-1944
Publication date 2011-02
Sub-type Article (original research)
DOI 10.3390/ma4020448
Open Access Status DOI
Volume 4
Issue 2
Start page 448
End page 456
Total pages 9
Place of publication Basel, Switzerland
Publisher M D P I AG
Collection year 2012
Language eng
Abstract In this work we investigate the effect of iron oxide embedded in silica matrices as a function of Fe/Si molar ratio and sol pH. To achieve homogeneous dispersion of iron oxide particles, iron nitrate nonahydrate was dissolved in hydrogen peroxide and was mixed with tetraethyl orthosilicate and ethanol in a sol-gel synthesis method. Increasing the calcination temperature led to a reduction in surface area, although the average pore radius remained almost constant at about 10 Å, independent of the Fe/Si molar ratio or sol pH. Hence, the densification of the matrix was accompanied by similar reduction in pore volume. However, calcination at 700 °C resulted in samples with similar surface area though the iron oxide content increased from 5% to 50% Fe/Si molar ratio. As metal oxide particles have lower surface area than polymeric silica structures, these results strongly suggest that the iron oxides opposed the silica structure collapse. The effect of sol pH was found to be less significant than the Fe/Si molar ratio in the formation of molecular sieve structures derived from iron oxide silica.
Keyword Iron oxide
Silica network
Molecular sieve structures
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes This article belongs to the Special Issue Sol-Gel Technique

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Chemical Engineering Publications
Official 2012 Collection
 
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Created: Fri, 14 Oct 2011, 07:51:28 EST by Joe Diniz Da Costa on behalf of School of Chemical Engineering