Removal of antibiotic rifampicin from aqueous media by advanced electrochemical oxidation: Role of electrode materials, electrolytes and real water matrices

Autor(es)

Brito, Laysa R. D. ^[1] ; Ganiyu, Soliu O. ^[1] ; dos Santos, Elisama V. ^[1] ; Oturan, Mehmet A. ^[2] ; Martinez-Huitle, Carlos A. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Fed Rio Grande do Norte, Inst Quim, Lab Eletroquim Ambiental & Aplicada, Campus Univ 3000, BR-59072900 Lagoa Nova, RN - Brazil

^[2] Univ Paris Est, Lab Geomat & Environm EA 4508, UPEM, F-77454 Marnela La Vallee - France

• Tipo de documento: Artigo Científico
• Fonte: Electrochimica Acta; v. 396, NOV 10 2021.
• Citações Web of Science: 0

Resumo

One of the most commonly detected classes of pharmaceutical products in aquatic environments are an-tibiotics and their effective removal in sewage treatment plants is limited due to their refractory features. In this context, electrochemical technologies could be an alternative to decrease the pollution level and promote the complete elimination of antibiotics in water. For this reason, the electrochemical treatment of a synthetic effluent as well as different real water matrices polluted with antibiotic rifampicin was investigated, using different electrode materials (anodes: boron doped diamond, (BDD), Pt and PbO2; and cathodes: carbon felt (CF), graphite (Gr), stainless steel (SS) and titanium (Ti)). Effects on the variation of applied current density (j) and supporting electrolyte were examined during the degradation of the antibiotic. Comparative studies have clearly showed that the degradation of rifampicin had better results by using BDD and CF as anode and cathode, respectively, where the process efficiency increased when an increase on the j was attained. Complete color removal was achieved at all j applied (chromophore rifampicin group gives a red-orange color for solutions), whereas only at higher j leads to complete or-ganic matter (in terms of chemical oxygen demand (COD)) removal. For a selected cathode, the efficiency of the anode materials follows the trends BDD > PbO2 > Pt, whereas that of cathode follows CF> Ti> SS approximate to Gr for a selected anode material. Using Na2SO4, Na2CO3 or NaCl, the production of strong secondary ox-idant species was favored, promoting the oxidation of dissolved organic matter in synthetic effluents. Meanwhile, when the BDD/CF electrochemical cell was employed with different real water matrices, the degradation and mineralization of the drug was independent of this parameter. Oxalic, acetic, fumaric and maleic acids were the final organic byproducts of rifampicin degradation with the release of heteroatom N under NO3- and NH4+ forms. (C) 2021 Elsevier Ltd. All rights reserved. (AU)

• Processo FAPESP: 19/13113-4 - Processos foto (eletro) catalíticos e fotoeletro-fenton para eliminar contaminantes emergentes de águas de rejeito industriais
• Beneficiário: Maria Valnice Boldrin
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 14/50945-4 - INCT 2014: Instituto Nacional de Tecnologias Alternativas para Detecção, Avaliação Toxicológica e Remoção de Micropoluentes e Radioativos
• Beneficiário: Maria Valnice Boldrin
• Modalidade de apoio: Auxílio à Pesquisa - Temático