[en] Three 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. Four thermal treatments were applied to catalysts: drying, drying-autoclaving, calcination and calcination-autoclaving. Textural characterizations show that the specific surface area is increased by calcination while materials microporosity completely collapse when using autoclaving. Based on Mössbauer spectroscopy and magnetometry measurements, only Fe3+ species were observed in xerogel catalysts. The photo-Fenton effect of these catalysts was evaluated on the degradation of p-nitrophenol in aqueous media. In the presence of H2O2, results show that this effect reachs 99% of degradation after 24 h. Mössbauer and catalytic tests are presented in another paper.
Disciplines :
Chemical engineering Materials science & engineering
Author, co-author :
Mahy, Julien ; Université de Liège > Department of Chemical Engineering > Génie chimique - Procédés et développement durable
Tasseroul, Ludivine ; Université de Liège > Agronomie, Bio-ingénierie et Chimie (AgroBioChem) > Bio-industries
Herlitschke, Marcus
Hermann, Raphaël ; Université de Liège > Département de chimie (sciences) > Département de chimie (sciences)
Lambert, Stéphanie ; Université de Liège > Department of Chemical Engineering > Department of Chemical Engineering
Language :
English
Title :
Fe3+/Iron Oxide/SiO2 Xerogel Catalysts for p-nitrophenol Degradation by Photo-Fenton Effects: Influence of Thermal Treatment on Catalysts Texture
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