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Title: Microwave-assisted sol-gel synthesis of an Au-TiO2 photoanode for the advanced oxidation of paracetamol as model pharmaceutical pollutant
Author: Hernández, Rafael
Olvera-Rodríguez, Isidoro
Guzmán, Carlos
Medel, Alejandro
Escobar-Alarcón, Luis
Brillas, Enric
Sirés Sadornil, Ignacio
Esquivel Escalante, Karen
Keywords: Fotocatàlisi
Oxidació electroquímica
Electrolytic oxidation
Issue Date: 18-Sep-2018
Publisher: Elsevier B.V.
Abstract: An Au-TiO2 photoanode on carbon cloth has been synthesized by microwave-assisted sol-gel method to treat paracetamol solutions at pH 3.0 by photocatalysis (PC), electro-oxidation (EO), photoelectrocatalysis with UVA light (PEC), solar PEC (SPEC) and hybrid methods with photoelectro-Fenton under UVA (PEC+PEF) and sunlight (SPEC+SPEF) irradiation at constant anodic potential (Ean). The photoanode has been characterized by XRD, Raman spectroscopy, HRTEM and SEM-EDS. The counter electrode was a 316L stainless steel plate, which was replaced by an air-diffusion electrode for H2O2 generation in hybrid treatments. The most powerful process was SPEC+SPEF, yielding total paracetamol removal in less than 30 min and 24% mineralization after 180 min, at Ean = +0.82 V. The paracetamol decay followed a pseudo-first-order kinetics in PEC. A lower rate constant was obtained upon increase of pharmaceutical concentration, showing good linear fit using a Langmuir-Hinshelwood model.
Note: Versió postprint del document publicat a:
It is part of: Electrochemistry Communications, 2018, vol. 96, p. 42-46
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ISSN: 1388-2481
Appears in Collections:Articles publicats en revistes (Ciència dels Materials i Química Física)

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