Busca avançada
Ano de início
Entree
(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Combined photoelectrocatalytic/electro-Fenton process using a Pt/TiO2NTs photoanode for enhanced degradation of an azo dye: A mechanistic study

Texto completo
Autor(es):
Almeida, Lucio C. [1] ; Silva, Bianca F. [1] ; Zanoni, Maria V. B. [1]
Número total de Autores: 3
Afiliação do(s) autor(es):
[1] UNESP, Inst Chem Araraquara, Dept Analyt Chem, BR-14800900 Araraquara, SP - Brazil
Número total de Afiliações: 1
Tipo de documento: Artigo Científico
Fonte: Journal of Electroanalytical Chemistry; v. 734, p. 43-52, NOV 15 2014.
Citações Web of Science: 8
Resumo

The combined photoelectrocatalytic/electro-Fenton (PEC/EF) process containing a Pt/TiO2NTs photoanode and an air-diffusion PTFE cathode is investigated in the degradation of the Acid Red 29 (AR29) dye. The photoelectrocatalytic (PEC), electro-Fenton (EF) and photoelectrocatalytic/electro-Fenton (PEC/EF) processes are compared in the performance of dye treatment. The mineralisation ability of the AR29 dye increased in the sequence PEC < EF < PEC/EF with total organic carbon (TOC) decays of 81%, 90% and 98%, respectively. The AR29 decays followed a pseudo first-order kinetic. The higher mineralisation capacity obtained for the PEC/EF process in comparison with the PEC and EF processes was ascribed to the additional production of (OH)-O-. by the photolytic reactions in bulk and on the Pt/TiO2NTs surface. The synergetic effect from the photocatalytic reduction of H2O2 onto the electrode surface (which minimises the electron/hole pair recombination) and the photolysis of Fe(III)-carboxylate complexes also enhanced the degradation efficiency of the coupled process. Finally, a plausible pathway for AR29 degradation via the PEC/EF process was proposed based on the by-products detected by HPLC and LC-MS/MS. (C) 2014 Elsevier B.V. All rights reserved. (AU)

Processo FAPESP: 11/21606-9 - Síntese e caracterização de fotoanodos de Ti/TiO2-Pt e de Ti/TiO2/WO3 para aplicação na degradação de corantes VAT via processo Fotoeletro-Fenton
Beneficiário:Lucio César de Almeida
Linha de fomento: Bolsas no Brasil - Pós-Doutorado