Theoretical-experimental study of the advanced oxidative process using peracetic acid and solar radiation: Removal efficiency and thermodynamic elucidation of radical formation processes

Autor(es)

Bezerra, Leydiane Barbosa ^[1] ; Carlos, Thayrine Dias ^[2] ; Nogueira das Neves, Ana Paula ^[3] ; Duraes, Whisley Alceno ^[1] ; Sarmento, Renato de Almeida ^[4] ; Pereira, Douglas Henrique ^{[3, 1]} ; Cavallini, Grasiele Soares ^{[3, 1]}

Afiliação do(s) autor(es)

^[1] Univ Fed Tocantins, Curso Quim Ambiental, BR-77402970 Gurupi, Tocantins - Brazil

^[2] Univ Fed Tocantins, Programa Posgrad Biodiversidade & Biotecnol Amazo, BR-77402970 Gurupi, Tocantins - Brazil

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

^[4] Univ Fed Tocantins, Programa Posgrad Prod Vegetal, BR-77402970 Gurupi, Tocantins - Brazil

• Tipo de documento: Artigo Científico
• Fonte: JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY; v. 423, JAN 15 2022.
• Citações Web of Science: 0

Resumo

Advanced Oxidative Processes (AOPs) are efficient methods of treating industrial effluents specially to dyes, and therefore, there is great interest in the development of new methods that can contribute to the degradation of complex contaminants. In this work, peracetic acid (PAA) photolysed by solar radiation was used for the degradation of the methylene blue dye and the following factors were evaluated: PAA concentration, pH, temperature, dose of solar radiation and isolated action of the PAA constituents. The results obtained demonstrated that the concentration of 28.6 mmol L-1 of PAA showed dye degradation efficiency of 77.5% in the assay without radiation and reached 98.5% with a solar radiation with a dose of 61905.95 Wminm- 2. Through theoretical calculations it was possible to determine the values of bond dissociation enthalpy (BDE) which showed that the formation of the hydroxyl radical by PAA requires less energy (46.42 kcal mol-1). Higher energies are required for H2O2 (50.12 kcal mol-1) and acetic acid (109.68 kcal mol- 1). Thus, the formation of the hydroxyl radical in the presence of PAA occurs more easily and there is the increase in temperature which was not observed for isolated reagents H2O2 and acetic acid. (AU)

• 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
• 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