Degradation of 2,4,6-trichlorophenol in aqueous systems through the association of zero-valent-copper-mediated reduction and UVC/H2O2: effect of water matrix and toxicity assessment

Autor(es)

de Souza, Larissa Pinheiro ^[1] ; Graca, Catia Alexandra Leca ^{[2, 3]} ; Teixeira, Antonio Carlos S. C. ^[1] ; Chiavone-Filho, Osvaldo ^[4]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Dept Chem Engn, Res Grp Adv Oxidat Proc AdOx, Sao Paulo - Brazil

^[2] Univ Porto, Dept Chem Engn, Lab Separat & React Engn, Porto - Portugal

^[3] Univ Porto, Dept Chem Engn, Lab Catalysis & Mat LSRE LCM, Porto - Portugal

^[4] Univ Fed Rio Grande do Norte, Natal, RN - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Environmental Science and Pollution Research; v. 28, n. 19, SI, p. 24057-24066, MAY 2021.
• Citações Web of Science: 1

Resumo

The presence of toxic chlorinated compounds in drinking water, generated during the disinfection step in water treatment plants, is of great concern for public health. In the present study, the performance of the UVC/H2O2 process, preceded by zero-valent-copper reduction, was evaluated for degrading 2,4,6-trichlorophenol (TCP). With this aim, the oxidation performed alone or in combination with the pre-reductive step was evaluated regarding TCP concentration over time, removal rate, mineralization, and toxicity to Vibrio fischeri, as well as oxidant dosage and the effect of water matrix. The UV/H2O2 process achieved fast (k(obs) = 1.4 min(-1)) and complete TCP degradation, as well as important mineralization (40.4%), with best results obtained for initial H2O2 concentration of 0.056 mmol L-1. Coupling of reductive and oxidative processes intensified contaminant mineralization, due to the synergistic effect of copper ions leached in the reductive process, particularly Cu(I), providing an additional route of H2O2 activation for generating HO center dot radicals (photo-Fenton-like process). High toxicity removals and increased mineralization could be successfully accomplished by the combined processes even in tap water, which is a clear advantage for practical application. (AU)

• Processo FAPESP: 13/50218-2 - CEPEMA - Centro Cooperativo em Engenharia Ambiental
• Beneficiário: Claudio Augusto Oller do Nascimento
• Modalidade de apoio: Auxílio à Pesquisa - Temático