Raw montmorillonite modified with iron for photo-Fenton processes: Influence of iron content on textural, structural and catalytic properties
A raw montmorillonite was exchanged with the trinuclear Fe(III) acetate complex and calcined at 400 °C. Ratios of 0.5, 1.0 and 3.5 mmol of complex per gram of clay were employed. The pillared solids (Fe-PILCs) were analyzed by X-ray fluorescence spectroscopy, thermogravimetry analysis, scanning elec...
| Autores: | , , , , , , |
|---|---|
| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2017 |
| País: | Argentina |
| Institución: | Consejo Nacional de Investigaciones Científicas y Técnicas |
| Repositorio: | CONICET Digital (CONICET) |
| Idioma: | inglés |
| OAI Identifier: | oai:ri.conicet.gov.ar:11336/54331 |
| Acceso en línea: | http://hdl.handle.net/11336/54331 |
| Access Level: | acceso abierto |
| Palabra clave: | Fe-Pilc Heterogeneous Photo-Fenton Iron Content Maghemite Particles Phenol Degradation https://purl.org/becyt/ford/1.4 https://purl.org/becyt/ford/1 |
| Sumario: | A raw montmorillonite was exchanged with the trinuclear Fe(III) acetate complex and calcined at 400 °C. Ratios of 0.5, 1.0 and 3.5 mmol of complex per gram of clay were employed. The pillared solids (Fe-PILCs) were analyzed by X-ray fluorescence spectroscopy, thermogravimetry analysis, scanning electron microscopy, Mössbauer spectroscopy, X-ray diffraction and nitrogen adsorption isotherms. Total iron amount incorporated by the clay increases with the complex/clay ratio used from 6.1% to 17.6%. Iron is incorporated mainly in the interlayer space when the clay is pillared with the smallest complex/clay ratio and a microporous network is generated. Adsorption of iron on the outer surface is favored for higher iron loads and results in the creation of a mesoporous structure. Mössbauer analysis shows the presence of iron as maghemite (γ-Fe2O3) particles with a wide particle size distribution. All the Fe-PILCs were active as catalysts for phenol degradation under photo-Fenton like conditions using UVA radiation and a maximum in their activity is achieved for an intermediate iron content (13.4%). |
|---|