Identificador persistente para citar o vincular este elemento: http://hdl.handle.net/10553/56254
Título: Catalytic efficiency of Cu-supported pyrophyllite in heterogeneous catalytic oxidation of phenol
Autores/as: El Gaidoumi, A.
Doña Rodríguez, José Miguel 
Pulido Melián, Elisenda 
González Díaz, Oscar Manuel 
Navío, J. A.
El Bali, B.
Kherbeche, A.
Clasificación UNESCO: 2307 Química física
Palabras clave: Heterogeneous catalysis
Phenol
Copper
Catalyst
Impregnated pyrophyllite
Fecha de publicación: 2019
Publicación seriada: Arabian Journal For Science And Engineering 
Resumen: The copper-impregnated pyrophyllite (Cu/RC) was prepared and used as catalyst in catalytic wet peroxide oxidation (CWPO) of phenol. The catalyst was prepared by impregnation of copper (2.5 wt%) into pyrophyllite-type clay and characterized by X-ray diffraction, X-ray fluorescence, X-ray photoelectron spectroscopy, Fourier transform infrared spectroscopy, and transmission electron microscopy. The optimum operation conditions for CWPO of phenol over Cu/RC were determined by investigating the effects of pH, temperature, catalyst amount, and hydrogen peroxide concentration. Stability of the Cu/RC catalyst and toxicity of treated solution were studied, by measuring the copper concentration leached out from the catalyst and the inhibition of Vibrio fischeri bacteria bioluminescence, respectively. The probable degradation mechanism of phenol over Cu/RC was considered by HPLC analysis. The obtained results showed that Cu/RC achieved highest activity (total phenol degradation and 80% TOC reduction) and detoxification with remarkable low copper leaching concentration (0.006 mgL-1) at optimized conditions (pH = 3, T=50∘C, 2 gL-1 catalyst amount, 50 mg L - 1 phenol concentration and 7.45 mmolL-1 hydrogen peroxide concentration during 4 h). Meanwhile, few intermediates with low concentration were observed by the HPLC analysis for the CWPO of phenol. The Cu/RC catalyst showed a good activity after five successive runs (88% of degradation and 73% mineralization) at optimized conditions.
URI: http://hdl.handle.net/10553/56254
ISSN: 2193-567X
DOI: 10.1007/s13369-019-03757-2
Fuente: Arabian Journal For Science And Engineering [ISSN 2193-567X], v. 44 (7), p. 6313–6325
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