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Author(s): Francisca C. Moreira
Rui A. R. Boaventura
Enric Brillas
Vítor J. P. Vilar
Title: Degradation of trimethoprim antibiotic by UVA photoelectro-Fenton process mediated by Fe(III)-carboxylate complexes
Issue Date: 2015
Abstract: 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.
Subject: Tecnologia ambiental, Engenharia do ambiente
Environmental technology, Environmental engineering
Scientific areas: Ciências da engenharia e tecnologias::Engenharia do ambiente
Engineering and technology::Environmental engineering
Related Information: 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
Document Type: Artigo em Revista Científica Internacional
Rights: restrictedAccess
Appears in Collections:FEUP - Artigo em Revista Científica Internacional

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