Utilize este identificador para referenciar este registo:
https://hdl.handle.net/10216/105798
Autor(es): | Francisca C. Moreira Sergi Garcia-Segura Rui A.R. Boaventura Enric Brillas Vítor J. P. Vilar |
Título: | Degradation of the antibiotic trimethoprim by electrochemical advanced oxidation processes using a carbon-PTFE air-diffusion cathode and a boron-doped diamond or platinum anode |
Data de publicação: | 2014 |
Resumo: | The degradation of 20.0 mg L-1 of trimethoprim (TMP), an antibiotic commonly detected in wastewaters, in an aqueous solution with 7.0 g L-1 Na2SO4 was accomplished by electrochemical advanced oxidation processes (EA0Ps) such as anodic oxidation with electrogenerated H2O2 (AO-H2O2), electro-Fenton (EF), photoelectro-Fenton (PEF) and solar photoelectro-Fenton (SPEF), as well as by the classical Fenton and photo-Fenton processes. All experiments were performed in a novel 2.2 L lab-scale flow plant equipped with compound parabolic collectors (CPCs) and an electrochemical filter-press cell with a BDD or Pt anode and a carbon-PTFE air-diffusion cathode to electrogenerate H2O2. The effect of initial Fe2+ concentration, current density and pH on the PEF method with the BOO anode (PEF-BDD) was firstly assessed by means of TMP and dissolved organic carbon (DOC) decays, aiming to establish a treatment process using minimal iron concentration, adequate current density/H2O2 production and maximal pH. This treatment was efficiently performed using a low Fe2+ dose of 2.0 mg L-1, a low current density of 5 mA cm(-2) and pH of 3.5 without iron precipitation. The relative oxidation ability of EA0Ps using the BDD/air-diffusion cell increased in the order: AO-H2O2 < EF< PEF < SPEF. The EF-BDD and PEF-BDD processes were more effective than the comparable Fenton and photo-Fenton ones. The PEF-BDD process exhibited slightly faster TMP degradation than the PEF-Pt one, whereas in SPEF the influence of the anode was almost negligible. After ca. 37 kJ L-1 UV energy, 77 and 73% mineralization with 30 and 26% current efficiency and 1.2 and 0.9 kWh m(-3) energy cost were obtained, respectively. It was found a slow and partial TMP mineralization mainly linked to the formation of a high content of hardly oxidizable N-derivatives, containing the major part of N. Up to 18 aromatic products and 19 hydroxylated derivatives were detected by LC-MS during TMP degradation by PEF-Pt. An additional SPEF-Pt experiment using a real wastewater matrix spiked with TMP attained slower TMP and DOC decays. |
Assunto: | Tecnologia ambiental, Engenharia do ambiente Environmental technology, Environmental engineering |
Áreas do conhecimento: | Ciências da engenharia e tecnologias::Engenharia do ambiente Engineering and technology::Environmental engineering |
URI: | https://hdl.handle.net/10216/105798 |
Informação Relacionada: | info:eu-repo/grantAgreement/FCT - Fundação para a Ciência e Tecnologia/Projetos Estratégicos/PEst-C/EQB/LA0020/2013/PROJECTO ESTRATÉGICO - LA 20 - 2013-2014/LA 20 |
Tipo de Documento: | Artigo em Revista Científica Internacional |
Condições de Acesso: | restrictedAccess |
Aparece nas coleções: | FEUP - Artigo em Revista Científica Internacional |
Ficheiros deste registo:
Ficheiro | Descrição | Tamanho | Formato | |
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93936.1.docx Restricted Access | Supplementary Material | 280.1 kB | Microsoft Word XML | Request a copy from the Author(s) |
93936.pdf Restricted Access | Article | 1.59 MB | Adobe PDF | Request a copy from the Author(s) |
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