Artículo
Modified ilmenite as catalyst for CWPO-Photoassisted process under LED light
Fecha de publicación:
06/2017
Editorial:
Elsevier Science Sa
Revista:
Chemical Engineering Journal
ISSN:
1385-8947
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
The influence of the iron chemical nature contained in ilmenite (FeTiO3) upon the activity and stability of these materials as catalysts for CWPO-Photoassisted process under LED light (λ: 405 nm) were evaluated. Raw ilmenite was treated with H2 within the range 25–1000 °C in order to partially reduce iron oxides to Fe(0). The catalysts were characterized by N2 adsorption/desorption, TXRF, XRD and XPS analysis. The co-presence of different iron species (Fe(0), Fe(II) and Fe(III)) along with the light effect over material surface, led to an increase of H2O2 decomposition rate into HO[rad] and, therefore, a higher oxidation rate. In all case, after total H2O2 depletion, a complete phenol degradation and a 95% TOC conversion was reached in batch at pH0 = 3 and 50 °C using the stoichiometric H2O2 dose (14 mol H2O2/mol phenol) and 10 W m−2 LED light. Long-term continuous experiments were carried out to assess the stability and the lifetime of the catalyst. The higher reduction degree led to a higher organic matter mineralization but also to a higher leaching of active phase around 3% of the total iron amount in ilmenite. Nevertheless, catalyst deactivation seems to be related to the oxidation of iron on the catalyst surface.
Palabras clave:
Cwpo
,
Ilmenite
,
Intensification
,
Led
,
Photoassisted
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Articulos(INTEQUI)
Articulos de INST. DE INVEST. EN TECNOLOGIA QUIMICA
Articulos de INST. DE INVEST. EN TECNOLOGIA QUIMICA
Citación
García Muñoz, P.; Pliego, G.; Zazo, J. A.; Barbero, Bibiana Patricia; Bahamonde, A.; et al.; Modified ilmenite as catalyst for CWPO-Photoassisted process under LED light; Elsevier Science Sa; Chemical Engineering Journal; 318; 6-2017; 89-94
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