Removal of methyl orange by heterogeneous Fenton catalysts prepared using glycerol as green reducing agent

This study aims to prepare environmentally friendly iron catalysts supported on silica, using glycerol as green reducing and stabilizing agent, for application in heterogeneous Fenton degradation of the pollutant dye methyl orange (MO). The catalysts were characterized by X-ray powder diffraction, a...

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Bibliographic Details
Published in:Environmental technology 2018-11, Vol.39 (21), p.2822-2833
Main Authors: Trotte, Natália S. F., Alzamora, M., Sánchez, D. R., Carvalho, Nakédia M. F.
Format: Article
Language:English
Subjects:
Atomic absorption analysis
Atomic absorption spectroscopy
Atomic beam spectroscopy
Azo Compounds
Catalysis
Catalysts
dye degradation
Dyes
Environmental degradation
Ferric Compounds
Fourier transforms
Glycerol
heterogeneous Fenton
Hydrogen Peroxide
Infrared analysis
Iron
Iron catalysts
metal oxalate
methyl orange
Microscopy
Nanoparticles
Nickel
Nitrates
Oxalates
Oxidation
Pollutants
Reducing Agents
Scanning electron microscopy
Silica
Silicon Dioxide
Spectral analysis
Transmission electron microscopy
X ray powder diffraction
Zinc
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Summary:This study aims to prepare environmentally friendly iron catalysts supported on silica, using glycerol as green reducing and stabilizing agent, for application in heterogeneous Fenton degradation of the pollutant dye methyl orange (MO). The catalysts were characterized by X-ray powder diffraction, atomic absorption spectroscopy, scanning electron microscopy, transmission electron microscopy, thermogravimetric analyses, Mössbauer and Fourier transform infrared spectroscopies, which revealed the formation of iron(II)/(III) oxalates from the oxidation of glycerol by the iron(III) nitrate precursor. Besides, iron oxihydroxide nanoparticles with superparamagnetic behavior were also formed. Iron catalysts prepared in the presence of nickel(II) or zinc(II) nitrates lead to the formation of the corresponding oxalates. The catalysts were able to degrade MO, efficiently in 180 min of reaction. Fe/SiO 2 furnished higher reaction rates, followed by Zn4Fe2/SiO 2 , which presented higher iron content as well as the smallest nanoparticles. Reaction parameters such as catalyst dosage, hydrogen peroxide concentration, pH and reaction temperature were investigated.
ISSN:0959-3330
1479-487X
DOI:10.1080/09593330.2017.1367038