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Journal of Nanomaterials
Volume 2016 (2016), Article ID 1256851, 6 pages
http://dx.doi.org/10.1155/2016/1256851
Research Article

Iron Doped SBA-15 Mesoporous Silica Studied by Mössbauer Spectroscopy

1Institute of Computational Intelligence, Czestochowa University of Technology, Aleja Armii Krajowej 36, 42-201 Czestochowa, Poland
2Institute of Physics, Czestochowa University of Technology, Aleja Armii Krajowej 19, 42-201 Czestochowa, Poland
3Institute of Computer Science, Czestochowa University of Technology, Ulica Dobrowskiego 69, 42-201 Czestochowa, Poland
4Rootinnovation Spółka z o.o., Ulica Matejki 11/1a, 50-016 Wrocław, Poland

Received 8 January 2016; Accepted 17 March 2016

Academic Editor: Pushpendra Kumar

Copyright © 2016 Łukasz Laskowski et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Mesoporous silica SBA-15 containing propyl-iron-phosphonate groups were considered to confirm their molecular structure. To detect the iron-containing group configuration the Mössbauer spectroscopy was used. Both mesoporous silica SBA-15 containing propyl-iron-phosphonate groups and pure doping agent (iron acetylacetate) were investigated using Mössbauer spectroscopy. The parameters such as isomer shift, quadrupole splitting, and asymmetry in 57Fe Mössbauer spectra were analyzed. The differences in Mössbauer spectra were explained assuming different local surroundings of Fe nuclei. On this base we were able to conclude about activation of phosphonate units by iron ions and determinate the oxidation state of the metal ion. To examine bonding between iron atoms and phosphonic units the resonance Raman spectroscopy was applied. The density functional theory (DFT) approach was used to make adequate calculations. The distribution of active units inside silica matrix was estimated by comparison of calculated vibrational spectra with the experimental ones. Analysis of both Mössbauer and resonance Raman spectra seems to confirm the correctness of the synthesis procedure. Also EDX elemental analysis confirms our conclusions.