Artículo
Hierarchically structured TiO 2 -based composites for Fenton-type oxidation processes
Doumic, Lucila Inés
; Genova, Micaela; Zerjav, Gregor; Pintar, Albin; Cassanello, Miryan C.; Romeo, Hernan Esteban
; Ayude, María Alejandra
Fecha de publicación:
04/2019
Editorial:
Academic Press Ltd - Elsevier Science Ltd
Revista:
Journal of Environmental Management
ISSN:
0301-4797
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
A novel hierarchically structured composite aimed as a stable catalyst for the heterogeneous Fenton-type (HFT) oxidation process was developed by using a cost-effective and versatile technique. Prussian Blue nanoparticles (PBNP) were dispersed onto aligned macroporous TiO 2 (rutile) monoliths prepared via directional freezing of aqueous dispersions of TiO 2 nanoparticles. The catalytic performance was evaluated in the HFT oxidation of an azo dye frequently used as a model contaminant, Orange G (OG). Experiments were carried out in a liquid batch-recycle reactor, in which the liquid flow rate was set to ensure negligible external mass transfer resistance. The catalyst exhibited good activity to form highly oxidative radicals from hydrogen peroxide decomposition, which readily discolored OG. Significant reduction of the time required to attain complete discoloration and improvement in TOC removal were achieved by adjusting operating conditions and oxidant dosage strategies. Almost complete OG conversion at around 90 min and 34.4% of TOC removal after 4 h were achieved by using the best evaluated strategy. The catalyst activity was tested under specific operating conditions and remained unaltered during 42 cycles of 4 h each (total 168 h). The fresh and used PBNP/TiO 2 catalysts and the support were thoroughly characterized by several techniques. Results supported the excellent stability exhibited by the catalyst in the OG HFT oxidation.
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Articulos(INTEMA)
Articulos de INST.DE INV.EN CIENCIA Y TECNOL.MATERIALES (I)
Articulos de INST.DE INV.EN CIENCIA Y TECNOL.MATERIALES (I)
Citación
Doumic, Lucila Inés; Genova, Micaela; Zerjav, Gregor; Pintar, Albin; Cassanello, Miryan C.; et al.; Hierarchically structured TiO 2 -based composites for Fenton-type oxidation processes; Academic Press Ltd - Elsevier Science Ltd; Journal of Environmental Management; 236; 4-2019; 591-602
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