Photocatalytic removal of fluoroquinolones and their antimicrobial activity from water matrices at trace levels: a comparison of commercial TiO2 catalysts

Autor(es)

Lima Venancio, Wilson Augusto ^[1] ; Rodrigues-Silva, Caio ^[2] ; Maniero, Milena Guedes ^[1] ; Guimaraes, Jose Roberto ^[1]

Afiliação do(s) autor(es)

^[1] Univ Estadual Campinas, Sch Civil Engn Architecture & Urban Design, POB 6143, BR-13083889 Campinas, SP - Brazil

^[2] Univ Estadual Campinas, Inst Chem, Dept Analyt Chem, POB 6154, BR-13084971 Campinas, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: WATER SCIENCE AND TECHNOLOGY; v. 78, n. 8, p. 1668-1678, NOV 2018.
• Citações Web of Science: 3

Resumo

In this study, a solution containing the fluoroquinolones (FQs) ciprofloxacin, lomefloxacin, and ofloxacin (antimicrobial agents) was subjected to photocatalytic oxidation under UVA irradiation, employing the commercial titanium dioxide as catalyst. On-line solid phase extraction coupled to ultra-high-performance liquid chromatography-mass spectroscopy was used to pre-concentrate and quantify the analytes. The process provided an almost 95% degradation efficiency for all the FQs. The TiO2 PC500 (100% anatase) was more efficient than TiO2 P25 (80% anatase) for FQs degradation. The matrix effect on the efficiency of the process was evaluated by ultrapure water - UW, simulated water - SW, bottled water - BW, and public drinking tap water - TW. Simulated water showed lower interference, compared to drinking water and bottled mineral water, due to the lower concentrations of hydroxyl radical scavengers. The assessment of the residual antimicrobial activity in the solution, when using 50 mg L-1 PC500 or 100 mg L-1 P25, showed reductions of biological activity (after 120 min of reaction) of 92.4% and 95.4% for Escherichia coli, and 78.1% and 84.2% for Bacillus subtilis, respectively. It shows that the photocatalytic oxidation process was able to not only degrade the FQs but also deactivate its biological activity in the resultant solution. (AU)

• Processo FAPESP: 14/06201-0 - EMU concedido no processo 2013/09543-7- cromatógrafo líquido de ultraeficiência acoplado a detetores de arranjo de fotodiodos e espectrômetro de massas sequencial (UPLC-DAD-MS/MS)
• Beneficiário: Susanne Rath
• Modalidade de apoio: Auxílio à Pesquisa - Programa Equipamentos Multiusuários
• Processo FAPESP: 13/07817-2 - Degradação de sulfonamidas e tetraciclinas por UV/H2O2 e O3: avaliação da atividade antimicrobiana e da toxicidade
• Beneficiário: Milena Guedes Maniero Ferreira
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 13/09543-7 - Resíduos de medicamentos veterinários no ambiente
• Beneficiário: Susanne Rath
• Modalidade de apoio: Auxílio à Pesquisa - Temático
• Processo FAPESP: 14/16622-3 - Identificação dos intermediários formados durante a degradação de fármacos veterinários por processos oxidativos avançados
• Beneficiário: Caio Alexandre Augusto Rodrigues da Silva
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 14/06064-3 - EMU concedido no processo 2013/09543-7: cromatógrafo líquido de ultraeficiência com detetores de arranjo de fotodiodos e fluorescência (UPLC-DAD-FLD)
• Beneficiário: Susanne Rath
• Modalidade de apoio: Auxílio à Pesquisa - Programa Equipamentos Multiusuários