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Low tungsten content of nanostructured material supported on carbon for the degradation of phenol

Assumpção, M.H.M.T. ; De Souza, R.F.B. ; Reis, R.M. ; Rocha, R.S. ; Steter, J.R. ; Hammer, P. ; Gaubeur, I. ; Calegaro, M.L. ; Lanza, M.R.V. ; Santos, M.C.

Applied catalysis. B, Environmental, 2013-10, Vol.142-143, p.479-486 [Periódico revisado por pares]

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  • Título:
    Low tungsten content of nanostructured material supported on carbon for the degradation of phenol
  • Autor: Assumpção, M.H.M.T. ; De Souza, R.F.B. ; Reis, R.M. ; Rocha, R.S. ; Steter, J.R. ; Hammer, P. ; Gaubeur, I. ; Calegaro, M.L. ; Lanza, M.R.V. ; Santos, M.C.
  • Assuntos: Carbon ; Degradation ; Electrodes ; Mineralization ; Phenol ; Tungsten ; X-ray photoelectron spectroscopy ; X-rays
  • É parte de: Applied catalysis. B, Environmental, 2013-10, Vol.142-143, p.479-486
  • Notas: ObjectType-Article-2
    SourceType-Scholarly Journals-1
    ObjectType-Feature-1
    content type line 23
  • Descrição: A comparative study using different mass proportions of WO(3)/C(U, 5%, 10% and 15%) for H(2)O(2) electro-generation and subsequent phenol degradation was performed. To include the influence of the carbon substrate and the preparation methods, all synthesis parameters were evaluated. The WO(3)/C materials were prepared by a modified polymeric precursor method (PPM) and the sol-gel method (SGM) on Vulcan XC 72R and Printex L6 carbon supports, verifying the most efficient metal/carbon proportion. The materials were physically characterized by X-ray diffraction (XRD) and by X-ray photoelectron spectroscopy (XPS) techniques. The XRD and the XPS techniques identified just one phase containing WO(3) and elevated oxygen concentration on carbon with the presence of WO(3). The oxygen reduction reaction (ORR), studied by the rotating ring-disk electrode technique, showed that WO(3)/C material with the lowest tungsten content (1% WO(3)/C), supported on Vulcan XC 72R and prepared by SGM, was the most promising electrocatalyst for H(2)O(2) electrogeneration. This material was then analyzed using a gas diffusion electrode (GDE) and 585 mg L(-1) of H(2)O(2) was produced in acid media. This GDE was employed as a working electrode in an electrochemical cell to promote phenol degradation by an advanced oxidative process. The most efficient method applied was the photo-electro-Fenton; this method allowed for 65% degradation and 11% mineralization of phenol during a 2-h period. Following 12 h of exhaustive electrolysis using the photo-electro-Fenton method, the total degradation of phenol was observed after 4 h and the mineralization of phenol approached 75% after 12 h.
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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