| Autor: |
Marcus Herlitschke, Anthony Zubiaur, Ludivine Tasseroul, Raphaël P. Hermann, Julien G. Mahy, Benoît Heinrichs, Stéphanie Lambert, Magali Brisbois, Jérémy Geens |
| Rok vydání: |
2014 |
| Předmět: |
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| Zdroj: |
Microporous and Mesoporous Materials. 197:164-173 |
| ISSN: |
1387-1811 |
| Popis: |
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 Fe 3+ 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 Fe 3+ 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 H 2 O 2 , iron xerogel catalysts present a photo-Fenton effect, reaching 99% of degradation after 24 h. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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