Fenton-type process using peracetic acid: Efficiency, reaction elucidations and ecotoxicity

Autor(es)

Carlos, Thayrine Dias ^[1] ; Bezerra, Leydiane Barbosa ^[2] ; Vieira, Mayane Marques ^[2] ; Sarmento, Renato Almeida ^[3] ; Pereira, Douglas Henrique ^{[1, 2]} ; Cavallini, Grasiele Soares ^{[1, 2]}

Afiliação do(s) autor(es)

^[1] Univ Fed Tocantins, Programa Posgrad Quim, BR-77402970 Gurupi, Tocantins - Brazil

^[2] Univ Fed Tocantins, Curso Quim Ambiental, BR-77402970 Gurupi, Tocantins - Brazil

^[3] Univ Fed Tocantins, Programa Posgrad Prod Vegetal, BR-77402970 Gurupi, Tocantins - Brazil

• Tipo de documento: Artigo Científico
• Fonte: JOURNAL OF HAZARDOUS MATERIALS; v. 403, FEB 5 2021.
• Citações Web of Science: 6

Resumo

Recent studies on Fenton-type processes involving peracetic acid (PAA) stimulated further development of advanced oxidative processes (AOPs). The objective of this work was to provide new information about such processes, elucidate their reaction mechanisms both experimentally and theoretically, and verify their possible uses. The Fenton-type reaction of PAA with Fe3+ exhibited a greater dye degradation efficiency than the Fenton process, while the efficiency of the PAA reaction with Fe2+ was very close of Fenton process. Moreover, the processes photocatalyzed by solar radiation demonstrated comparable efficiencies due to the photoreduction of Fe3+ to Fe2+. By conducting theoretical calculations, it was found that the formation of oxidizing radicals during the reaction of PAA with Fe2+ was not thermodynamically favorable and, therefore, unsuitable for practical use. In contrast, the processes occurred in the PAA/Fe3+ system included thermodynamically spontaneous reactions that generated peroxyl (CH3C(O)OO center dot), alkoxyl (CH3C(O)center dot), and hydroperoxyl (HO2 center dot) radicals. The ecotoxicological tests demonstrated that the toxicity of the PAA to the organism Dugesia tigrina can be attributed to the presence of H2O2. (AU)

• Processo FAPESP: 13/08293-7 - CECC - Centro de Engenharia e Ciências Computacionais
• Beneficiário: Munir Salomao Skaf
• Modalidade de apoio: Auxílio à Pesquisa - Centros de Pesquisa, Inovação e Difusão - CEPIDs
• Processo FAPESP: 17/11485-6 - Desenvolvimentos computacionais e teóricos baseados em métodos ab initio e na Teoria do Funcional de Densidade
• Beneficiário: Rogério Custodio
• Modalidade de apoio: Auxílio à Pesquisa - Regular