Degradation of trimethoprim antibiotic by UVA photoelectro-Fenton process mediated by Fe(III)-carboxylate complexes

• Tipo: Artigo em Revista Científica Internacional
• Data: 2015

Autores

Francisca C. Moreira (Autor) FEUP; Rui A. R. Boaventura (Autor) FEUP; Enric Brillas (Autor) Outra; Vítor J. P. Vilar (Autor) FEUP

Revista

Título: Applied Catalysis B: Environmental

Vol. 162

Páginas: 34-44

ISSN: 0926-3373

Editora: Elsevier

Indexação

ISI Web of Knowledge - 40 Citações

ISI Web of Science

Scopus - 66 Citações

Classificação Científica

FOS: Ciências da engenharia e tecnologias > Engenharia do ambiente

CORDIS: Ciências Tecnológicas > Tecnologia > Tecnologia ambiental

Projetos Associados

LA 20 - PROJECTO ESTRATÉGICO - LA 20 - 2013-2014

Outras Informações

ID Authenticus: P-009-TP7

DOI: 10.1016/j.apcatb.2014.06.008

Abstract (EN): A UVA photo electro-Fenton (PEF) process mediated by Fe(III)-carboxylate complexes was applied to the removal of trimethoprim (TMP) antibiotic from water using a 2.2 L lab-scale flow plant equipped with a double compound parabolic collector (CPC) and an electrochemical cell composed of a boron-doped diamond (BDD) anode and a carbon-PTFE air-diffusion cathode. The presence of Fe(III)-carboxylate complexes enhances the regeneration of Fe3+ to Fe2+, allows to maintain iron in solution at higher pH values and can decrease the formation of Fe(III)-sulfate, Fe(III)-chloride and some Fe(III)-pollutants complexes. First, the efficiency of different carboxylate ligands like oxalate, citrate, tartrate and malate was assessed, followed by the application of various initial Fe(III)-to-carboxylate molar ratios and pH values. The PEF process with Fe(III)-oxalate, Fe(III)-citrate and Fe(III)-tartrate complexes revealed similar ability to degrade the antibiotic solution with the employment of 1:3, 1:1 and 1:1 Fe(III)-to-carboxylate molar ratios, respectively, and using pH of 4.5, Fe3+ concentration of 2.0 mg L-1 (total iron emission limit for the discharge of treated effluents according to the Portuguese legislation), current density of 5 mA cm(-2) and 20 degrees C. The PEF process mediated by Fe(III)-malate complexes was much less effective. 1:6 and 1:9 Fe(III)-to-oxalate molar ratios were required to yield similar TMP removal kinetics at pH 5.0 and 5.5 compared to pH 4.5, respectively. Additionally, the influence of initial TMP content and solution temperature on the PEF process with Fe(III)-carboxylate complexes was assessed and the role of the different reactive oxidizing species was clarified by the addition of scavenging agents. Generated low-molecular-weight carboxylic acids were monitored by ion-exclusion HPLC.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 11