Journal
MICROPOROUS AND MESOPOROUS MATERIALS
Volume 197, Issue -, Pages 164-173Publisher
ELSEVIER
DOI: 10.1016/j.micromeso.2014.06.009
Keywords
Sol-gel process; Cogelled xerogels; Iron oxide nanoparticles; Photo-Fenton effect; p-Nitrophenol degradation
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Funding
- Belgian National Funds for Scientific Research (F.R.S.-FNRS)
- Belgian Fonds pour la formation a la Recherche dans l'Industrie et dans l'Agriculture (FRIA)
- Helmholtz Association of German Research Centres for Grants [NG-407]
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Several iron xerogel catalysts were synthesized by hydrolysis and condensation of tetraethoxysilane (TEOS) and 3-(2-aminoethylamino)propyltrimethoxysilane (EDAS) which is able to form a chelate with iron ions. The EDAS/TEOS ratio strongly influences the texture of xerogel catalysts. The specific surface area and the micro- and mesoporous volume increase with this ratio. It seems that EDAS plays a nucleating agent role for silica particles and allows to anchor Fe-based moieties inside the silica network. Iron oxide nanoparticles of diameter 1-1.5 nm and Fe3+ ions result, encapsulated in silica particles with sizes of about 10-30 nm in diameter. The iron species was determined by Mossbauer spectroscopy and magnetometry measurements and only Fe3+ species were observed in xerogel catalysts. The Fenton and photo-Fenton effect of these catalysts were evaluated on the degradation of p-nitrophenol in aqueous media under different conditions. Results show that in the presence of H2O2, iron xerogel catalysts present a photo-Fenton effect, reaching 99% of degradation after 24 h. (C) 2014 Elsevier Inc. All rights reserved.
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