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

12Citations
Citations of this article
26Readers
Mendeley users who have this article in their library.

Abstract

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 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.

Cite

CITATION STYLE

APA

Almeida, L. C., Silva, B. F., & Zanoni, M. V. B. (2014). Combined photoelectrocatalytic/electro-Fenton process using a Pt/TiO2NTs photoanode for enhanced degradation of an azo dye: A mechanistic study. Journal of Electroanalytical Chemistry, 734, 43–52. https://doi.org/10.1016/j.jelechem.2014.09.035

Register to see more suggestions

Mendeley helps you to discover research relevant for your work.

Already have an account?

Save time finding and organizing research with Mendeley

Sign up for free