Insights into solar TiO2-assisted photocatalytic oxidation of two antibiotics employed in aquatic animal production, oxolinic acid and oxytetracycline

• Tipo: Artigo em Revista Científica Internacional
• Data: 2013

Autores

João H. O. S. Pereira (Autor) Outra; Ana C. Reis (Autor) Outra; Daniel Queirós (Autor) FEUP; Olga C. Nunes (Autor) FEUP; Maria T. Borges (Autor) FCUP; Vítor J. P. Vilar (Autor) FEUP; Rui A. R. Boaventura (Autor) FEUP

Revista

Título: Science of the Total Environment

Vol. 463 Nº OCT 1 2013

Páginas: 274-283

ISSN: 0048-9697

Editora: Elsevier

Indexação

ISI Web of Knowledge - 30 Citações

ISI Web of Science

Scopus - 95 Citações

Classificação Científica

FOS: Ciências exactas e naturais > Ciências da terra e ciências do ambiente

CORDIS: Ciências Naturais > Ciências do ambiente

Projetos Associados

PTDC/AAC-AMB/113091/2009 - Eliminação de micropoluentes com actividade antimicrobiana de águas residuais

Outras Informações

ID Authenticus: P-006-6PA

DOI: 10.1016/j.scitotenv.2013.05.098

Abstract (EN): In this study, solar driven TiO2-assisted heterogeneous photocatalytic experiments in a pilot-plant with compound parabolic collectors (CPCs) were carried out to study the degradation of two authorized veterinary antibiotics with particular relevance in finfish aquaculture, oxolinic acid (OXA) and oxytetracycline (OTC), using pure solutions of individual or mixed antibiotics. Firstly, the influence of natural solar photolysis was assessed for each antibiotic. Secondly, photocatalytic degradation kinetic rate constants for individual and mixed antibiotics were compared, using a catalyst load of 0.5 g L-1 and an initial pH around 75. Thirdly, for individually photocatalytic-treated OXA and OTC in the same conditions, the growth inhibition of Escherichia coli DSM 1103 was followed, and the mineralization extent was assessed by the residual dissolved organic carbon (DOC), low-molecular-weight carboxylate anions and inorganic ions concentration. Finally, the effect of inorganic ions, such as chlorides, sulfates, nitrates, phosphates, ammonium and bicarbonates, on the photocatalyric degradation of individual solutions of OXA and OTC was also evaluated and the formation of different reactive oxygen species were probed using selective scavengers. The removal profiles of each antibiotic, both as single component or in mixture were similar, being necessary 25 kJ L-1 of solar UV energy to fully remove them, and 18 kJuv L-1 to achieve 73% and 81% mineralization, for OXA and OTC, respectively. The remaining organic carbon content was mainly due to low-molecular-weight carboxylate anions. After complete removal of the antibiotics, the remaining degradation by-products no longer showed antibacterial activity. Also, 10% and 55% of the nitrogen content of each antibiotic was converted to ammonium, while no conversion to nitrite or nitrate was detected. The presence of phosphates hindered considerably the removal of both antibiotics, whereas the presence of other inorganic ions did not substantially altered the antibiotics photocatalytic degradation kinetics.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 10