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Removal of methyl orange by heterogeneous Fenton catalysts prepared using glycerol as green reducing agent.
Trotte, Natália S F; Alzamora, M; Sánchez, D R; Carvalho, Nakédia M F.
Afiliação
  • Trotte NSF; a Instituto de Química, Universidade do Estado do Rio de Janeiro , Rio de Janeiro , Brazil.
  • Alzamora M; b Universidade Federal do Rio de Janeiro , Duque de Caxias , Brasil.
  • Sánchez DR; c Instituto de Física, Universidade Federal Fluminense , Niterói , Brasil.
  • Carvalho NMF; a Instituto de Química, Universidade do Estado do Rio de Janeiro , Rio de Janeiro , Brazil.
Environ Technol ; 39(21): 2822-2833, 2018 Nov.
Article em En | MEDLINE | ID: mdl-28797210
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/SiO2 furnished higher reaction rates, followed by Zn4Fe2/SiO2, 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.
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Substâncias Redutoras / Glicerol Idioma: En Revista: Environ Technol Assunto da revista: SAUDE AMBIENTAL / TOXICOLOGIA Ano de publicação: 2018 Tipo de documento: Article País de afiliação: Brasil País de publicação: Reino Unido

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Substâncias Redutoras / Glicerol Idioma: En Revista: Environ Technol Assunto da revista: SAUDE AMBIENTAL / TOXICOLOGIA Ano de publicação: 2018 Tipo de documento: Article País de afiliação: Brasil País de publicação: Reino Unido