Influence of irradiation sources on the efficiency of copper-modified magnetite for photo-Fenton degradation of sulfathiazole

Autor(es)

Rojas-Mantilla, H. D. ^[1] ; Lazarevic, A. ^[1] ; Emidio, E. S. ^[1] ; Pupo Nogueira, R. F. ^[1]

Afiliação do(s) autor(es)

^[1] Sao Paulo State Univ UNESP, Inst Chem, BR-14800060 Araraquara, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: INTERNATIONAL JOURNAL OF ENVIRONMENTAL SCIENCE AND TECHNOLOGY; v. 18, n. 9, p. 2723-2732, SEP 2021.
• Citações Web of Science: 0

Resumo

A comparison of the catalytic activity of the copper-modified magnetite was carried out under different conditions (dark and irradiated) and irradiation systems (460 nm Vis-LED, 370 nm UV-LED and Solar) in the degradation of the antibiotic sulfathiazole (STZ). The catalyst copper-modified magnetite presented a mesoporous structure, with a high absorption range (200-800 nm), band gap of 1.80 eV characteristic of iron and copper oxides, negative surface charge (- 24.6 mV) at neutral pH and high stability in solution (absence of iron and copper leaching). The results showed that the degradation kinetics of STZ increased in the following order in relation to irradiation: dark < Vis-LED < UV-LED < Solar), promoting complete degradation after 15 min, indicating that under solar and UV irradiation the catalytic activity is improved, due to an increase in the speed of the Fe-Cu redox reactions from a quick transfer of electrons that occur on the surface of the catalyst, further facilitating the formation of HO center dot radicals. The results have further demonstrated that the copper-modified magnetite can promote heterogeneous Fenton processes under LED or solar irradiation and be applied to effective degradation of micropollutants in wastewaters and have proven the versatility and high catalytic activity. (AU)

• Processo FAPESP: 14/50945-4 - INCT 2014: Instituto Nacional de Tecnologias Alternativas para Detecção, Avaliação Toxicológica e Remoção de Micropoluentes e Radioativos
• Beneficiário: Maria Valnice Boldrin
• Modalidade de apoio: Auxílio à Pesquisa - Temático
• Processo FAPESP: 17/03148-0 - Degradação de contaminantes emergentes por processo Fenton heterogêneo mediado por magnetitas modificadas e resíduos de mineração de ferro
• Beneficiário: Hernan Dario Rojas Mantilla
• Modalidade de apoio: Bolsas no Brasil - Programa Capacitação - Treinamento Técnico