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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Application of a stable Ag/TiO2 film in the simultaneous photodegradation of hormones

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Autor(es):
Lima, Karla V. L. [1] ; Emidio, Elissandro S. [2] ; Pupo Nogueira, Raquel F. [2] ; Vasconcelos, Nazare do Socorro L. S. [1] ; Araujo, Adriana B. [1]
Número total de Autores: 5
Afiliação do(s) autor(es):
[1] Fed Inst Educ Sci & Technol Maranhao, Dept Chem, IFMA, BR-65030005 Sao Luis, Maranhao - Brazil
[2] Sao Paulo State Univ, Inst Chem Araraquara, Dept Analyt Chem, UNESP, Araraquara, SP - Brazil
Número total de Afiliações: 2
Tipo de documento: Artigo Científico
Fonte: JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY; v. 95, n. 10 NOV 2019.
Citações Web of Science: 2
Resumo

BACKGROUND The natural hormones estrone (E1) and 17 beta-estradiol (E2) and the synthetic hormone 17 alpha-ethynylestradiol (EE2) are excreted daily by humans and may reach water and wastewater treatment plants, which do not efficiently remove these estrogens. The aim of the present study was to evaluate the efficiency and reusability of Ag/TiO2 films as catalysts for simultaneous degradation of the hormones E1, E2 and EE2 in aqueous medium by heterogeneous photocatalysis and the contribution of reactive oxygenated species. The influence of aeration on the system and the effects of estrogen concentration and Ag/TiO2 film area were also evaluated in the photodegradation process. RESULTS The photocatalytic degradation assays showed efficiency higher than 97% for E2 and EE2 (10 mu g L-1) after approximately 3.5 h and above 95% for E1 (100 mu g L-1) after 4.5 h. It was observed that hydroxyl radical is the main reactive oxidant species in the photodegradation process, responsible for 87, 86 and 79% degradation of E1, E2 and EE2 respectively. CONCLUSION The treatment process applied using the Ag/TiO2 films proved to be very stable and efficient for the simultaneous degradation of the studied hormones up to 305 h of reaction period, obtaining a percentage of degradation above 90%. (c) 2019 Society of Chemical Industry (AU)

Processo FAPESP: 16/11373-0 - Degradação de drogas anticâncer em efluente hospitalar por processo foto-Fenton heterogêneo mediado por magnetitas modificadas e resíduos de mineração de ferro
Beneficiário:Elissandro Soares Emídio
Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado