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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.)

Degradation of NSAIDs by optimized photo-Fenton process using UV-LEDs at near-neutral pH

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Autor(es):
Marchetti, Maykel Douglas [1] ; Azevedo, Eduardo Bessa [1]
Número total de Autores: 2
Afiliação do(s) autor(es):
[1] Univ Sao Paulo, Chem Inst Sao Carlos IQSC, Lab Desenvolvimento Tecnol Ambientais LDTAmb, Ave Trabalhador Sao Carlense 400, BR-13560970 Sao Carlos, SP - Brazil
Número total de Afiliações: 1
Tipo de documento: Artigo Científico
Fonte: JOURNAL OF WATER PROCESS ENGINEERING; v. 35, JUN 2020.
Citações Web of Science: 0
Resumo

This paper addresses the degradation of waterborne drugs. Depending on the drug, endocrine disruption, antibiotics-resistant bacteria, (eco)toxicity etc. are common reported problems. As the existing tretment stations are not capable of completely removing those pollutants, new and highly efficient technologies should be developed for this purpose. The Fenton's reaction is a good candidate for that. However, acidic pH, sludge generation, and the need for the continuous addition of ferrous ion are problems to be overcome, e.g., by the photo-Fenton reaction. Here, the degradation of NSAIDS (salicylic acid, ketoprofen, diclofenac, paracetamol), and caffeine by the photo-Fenton process mediated by ferrioxalate with UV-LEDs was assessed. The initial concentration of each drug was 10 mg L-1 and the medium pH was set to 6.5. The optimized (response surface methodology) experimental conditions were: LEDs power: 1.768 W, CFe3+: 15.0 mg L-1, and C H2O2: 47.6 mg L-1. After 25 min, the concentrations of all studied drugs were below their respective detection limits, 30 and 40% of carbon (mineralization) and COD removals were achieved. All drugs followed a pseudo-first order degradation. Fast removals (approximately 80% in the first 10 min) and virtually identical rate constants (approximately 10(-1) min(-1)) were also achieved. The medium oxidation number of carbon ranged from 2.7 to 1.9. Phytotoxicity tests (Lactuca sativa) indicated that the proposed treatment did not generate ecotoxicity, despite the significant formation of degradation products. (AU)

Processo FAPESP: 14/02739-6 - Reuso de água em irrigação e aquicultura: inativação de fármacos e interferentes endócrinos pelo processo foto-fenton solar
Beneficiário:Eduardo Bessa Azevedo
Linha de fomento: Auxílio à Pesquisa - Regular