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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

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

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Author(s):
Assumpcao, M. H. M. T. [1] ; De Souza, R. F. B. [1] ; Reis, R. M. [2] ; Rocha, R. S. [2] ; Steter, J. R. [2] ; Hammer, P. [3] ; Gaubeur, I. [1] ; Calegaro, M. L. [2] ; Lanza, M. R. V. [2] ; Santos, M. C. [1]
Total Authors: 10
Affiliation:
[1] Univ Fed Abc, CCNH, LEMN, BR-09210170 Santo Andre, SP - Brazil
[2] Univ Sao Paulo, Inst Quim Sao Carlos, BR-13560970 Sao Carlos, SP - Brazil
[3] UNESP Univ Estadual Paulista, Inst Quim, BR-14801970 Araraquara, SP - Brazil
Total Affiliations: 3
Document type: Journal article
Source: APPLIED CATALYSIS B-ENVIRONMENTAL; v. 142, p. 479-486, OCT-NOV 2013.
Web of Science Citations: 29
Abstract

A comparative study using different mass proportions of WO3/C (1%, 5%, 10% and 15%) for H2O2 electrogeneration and subsequent phenol degradation was performed. To include the influence of the carbon substrate and the preparation methods, all synthesis parameters were evaluated. The WO3/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 WO3 and elevated oxygen concentration on carbon with the presence of WO3. The oxygen reduction reaction (ORR), studied by the rotating ring-disk electrode technique, showed that WO3/C material with the lowest tungsten content (1% WO3/C), supported on Vulcan XC 72R and prepared by SGM, was the most promising electrocatalyst for H2O2 electrogeneration. This material was then analyzed using a gas diffusion electrode (GDE) and 585 mg L-1 of H2O2 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. (c) 2013 Elsevier B.V. All rights reserved. (AU)

FAPESP's process: 10/04539-3 - Synthesis and characterization of nanostructured electrocatalysts for hydrogen peroxide in situ obtention and subsequent degradation of organic pollutants
Grantee:Mônica Helena Marcon Teixeira Assumpção
Support type: Scholarships in Brazil - Doctorate (Direct)
FAPESP's process: 10/16511-6 - Energy generation from biofuel using nanostructures
Grantee:Mauro Coelho dos Santos
Support type: Regular Research Grants
FAPESP's process: 07/04759-0 - Gas diffusion electrodes modified by organometallic compounds for hydrogen peroxide production
Grantee:Marcos Roberto de Vasconcelos Lanza
Support type: Regular Research Grants
FAPESP's process: 12/03516-5 - OXIDES-C supported electrocatalysts for direct liquid fuel cell anodes
Grantee:Rodrigo Fernando Brambilla de Souza
Support type: Scholarships in Brazil - Post-Doctorate
FAPESP's process: 09/09145-6 - Study of ethanol electrochemical oxidation mechanism on PtSn, PtCe and PtSnCe using in-situ spectroscopic techniques
Grantee:Rodrigo Fernando Brambilla de Souza
Support type: Scholarships in Brazil - Doctorate
FAPESP's process: 11/14314-1 - Study of the modification of gas diffusion electrodes with redox catalysts for in situ electrogeneration of hydrogen peroxide (H2O2)
Grantee:Marcos Roberto de Vasconcelos Lanza
Support type: Regular Research Grants