Ofloxacin degradation in chloride-containing medium by photo-assisted sonoelectrochemical process using a mixed metal oxide anode

Autor(es)

Antonelli, Raissa ; Malpass, Geoffroy Roger Pointer ; da Silva, Meuris Gurgel Carlos ; Vieira, Melissa Gurgel Adeodata

• Tipo de documento: Artigo Científico
• Fonte: JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING; v. 10, n. 2, p. 12-pg., 2022-04-01.

Resumo

A photo-assisted sonoelectrochemical (UV/US/EC) hybrid process using a mixed metal oxide (MMO) (e.g., Ti/ Ru0.3Ti0.7O2) electrode was evaluated with the aim of investigating the degradation and mineralization of ofloxacin (OFL) in a chloride-containing medium. Under optimized condition (30 mA/cm(2), 0.05 mol/L NaCl, 10 mL/min, and natural pH), the OFL concentration decayed to 0 in 5 min and, after only 60 min of treatment, similar to 60% TOC was removed. The comparison of different combinations of UV, US, and EC techniques showed that the UV/US/EC and UV/EC techniques were the most advantageous, due to the production of highly reactive radicals through photolysis of electrochemically generated active chlorine species. A significant reduction in OFL was only achieved in the presence of NaCl, compared to Na2SO4 as supporting electrolyte, demonstrating that DSA (R) electrodes have high electrocatalytic activity for chlorine evolution. Under real conditions, the percentage of OFL removal from the river water sample was 97% after 10 min of treatment. Phytotoxicity tests indicated that it is possible to reduce the toxicity of the solution using NaCl as supporting electrolyte. In addition, a mineralization pathway for OFL was proposed for the process in question. (AU)

• Processo FAPESP: 16/05007-1 - Remoção de fármacos residuais em solução aquosa por adsorventes alternativos
• Beneficiário: Meuris Gurgel Carlos da Silva
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 19/11353-8 - Centro Brasileiro de Pesquisa em Água (BWRC)
• Beneficiário: Lauro Tatsuo Kubota
• Modalidade de apoio: Auxílio à Pesquisa - Programa Centros de Pesquisa em Engenharia