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ELECTROCHEMICAL AND PHOTO-ELECTROCHEMICAL PROCESSES OF METHYLENE BLUE OXIDATION BY Ti/TiO2 ELECTRODES MODIFIED WITH FE-ALLOPHANE
Indexado
WoS WOS:000408266600021
Scopus SCOPUS_ID:85027000762
SciELO S0717-97072017000200021
DOI
Año 2017
Tipo artículo de investigación

Citas Totales

Autores Afiliación Chile

Instituciones Chile

% Participación
Internacional

Autores
Afiliación Extranjera

Instituciones
Extranjeras


Abstract



This work reports the degradation of methylene blue (MB) on Ti/TiO2 and Ti/TiO2/Fe-allophane electrodes in a pH3 using 0.1 M Na2SO4 as support electrolyte. SEM micrographs show a homogeneous distribution of TiO2 over the whole electrode surface forming nanotubes and nanopores. Fe-allophane modified electrode shows the formation of large-grains agglomerate on the electrode surface due to allophane, which provides a greater surface area to the electrode due to meso and micropore structures. Preliminary cyclic voltammetry show that Ti/TiO2 has the typical voltammetric response due to Ti(III)/Ti(IV) pair. Diffusional problems were observed through of the film when the electrode is modified with Fe-allophane modifying the quasi-reversible process Ti(III)/Ti(IV). Different kind of methodologies in the degradation process were used: Electrochemistry (EC), Photochemistry (PC), Photoelectrochemistry (PEC) and Adsorption (Ads). These methods were developing to discard any reaction or interaction that is not of interest. On Ti/TiO2 with PC and Ads methodologies was not observed any activity to MB degradation showing that is not photosensitive and that the interaction between this and surface electrode is low. But with EC and PEC degradation to 55% is reached after 3 hours of electrolysis. With Ti/TiO2 -Fe-allophane electrodes are observed a higher activity for all methodologies. The PC and Ads methods show that the MB degradation reaches to similar to 20 % of the initial concentration. As mentioned above, the PC and Ads processes no show degradation on Ti/TiO2, therefore the degradation it only due to the adsorption of MB in/on allophane coat behaving as concentrator matrix. A lower improvement is observed with EC process when is incorporated Ti/TiO2 -Fe-allophane is due to the barrier of the electrode surface by oxidation products. With PEC is reached the higher degradation value of similar to 88 %, showing an improvement of the degradation with the presence of Fe-allophane. The results indicate that the main role of Fe-allophane on the electrode

Disciplinas de Investigación



WOS
Chemistry, Multidisciplinary
Scopus
Chemistry (All)
SciELO
Exact And Earth Sciences

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Publicaciones WoS (Ediciones: ISSHP, ISTP, AHCI, SSCI, SCI), Scopus, SciELO Chile.

Colaboración Institucional



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Autores - Afiliación



Ord. Autor Género Institución - País
Lezana, Nicole Mujer Universidad de Santiago de Chile - Chile
Fernández-Vidal, Francisco Hombre Universidad de Santiago de Chile - Chile
BERRIOS-GUINEZ, CRISTHIAN EDUARDO - Universidad de Santiago de Chile - Chile
GARRIDO-RAMIREZ, ELIZABETH GINETTE Mujer Universidad Nacional Andrés Bello - Chile
Universidad de Santiago de Chile - Chile
1 Lezana, Nicole Mujer Universidad de Santiago de Chile - Chile
2 Fernández-Vidal, Francisco Hombre Universidad de Santiago de Chile - Chile
3 BERRIOS-GUINEZ, CRISTHIAN EDUARDO - Universidad de Santiago de Chile - Chile
4 GARRIDO-RAMIREZ, ELIZABETH GINETTE Mujer Universidad Nacional Andrés Bello - Chile
Universidad de Santiago de Chile - Chile

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Financiamiento



Fuente
Dicyt-USACH
FONDECYT-CONICYT

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Agradecimientos



Agradecimiento
This work was supported by FONDECYT-CONICYT Grant 11090336 and Dicyt-USACH 21441BG.
This work was supported by FONDECYT-CONICYT Grant 11090336 and Dicyt-USACH 21441BG.
This work was supported by FONDECYT-CONICYT Grant 11090336 and Dicyt-USACH 21441BG.

Muestra la fuente de financiamiento declarada en la publicación.