Data/hora: 08/06/2024 00:31:34

Biblioteca(s): | Embrapa Instrumentação.
Data corrente: | 24/03/2022
Data da última atualização: | 24/06/2022
Autoria: | JWSUS, E. T. de; MOREIRA, A. J.; SÁ, M. C.; FRESCHI, G. P. G.; JOYA, M. R.; LI, M. S.; PARIS, E. C.
Afiliação: | ELAINE CRISTINA PARIS, CNPDIA.
Título: | Potential of Nb2O5 nanofibers in photocatalytic degradation of organic pollutants.
Ano de publicação: | 2022
Fonte/Imprenta: | Environmental Science and Pollution Research, v. 28, 2021.
Páginas: | 69401?69415
DOI: | https://doi.org/10.1007/s11356-021-15435-8
Idioma: | Inglês
Conteúdo: | Various photocatalytic nanomaterials for environmental remediation have been promoted due to the pollution caused by different organic pollutants. In this study, Nb2O5 nanofibers were obtained by electrospinning technique, presenting controlled crystallinity and high specific surface area to improve the photoactivity response. The structural characterization indicated Nb2O5 nanofibers with orthorhombic phase formation. The photoluminescence measurements showed different energy levels contributing to the electronic transition events. The nanofibers with a bandgap up to 3.6 eV were applied to photocatalysis of dyes (rhodamine B (RhB) or methylene blue (MB)) and fluoxetine (FLX), listed as an emergent pollutant. In the optimized condition (pH = 9), the RhB and MB photocatalysis was 59% and 93% more efficient than photolysis due to ζ = − 50 mV ± 5 for EtOH_550 sample increased interaction with MB (cationic) compared to RhB unprotonated (pKa = 3.7). Therefore, FLX (pKa = 10.7) was selected due to protonated form at pH = 9 and showed 68% ± 1 adsorption in 30 min for EtOH_550. The FLX photocatalytic degradation under UV light irradiation was up to 17% higher than the photolytic degradation. The formation of hydroxyl radicals in the photocatalytic system (EtOH_550) was proven by the Coumarine probe assay, corroborating with the greater amount of α-[2-(methylamino)ethyl]benzylalcohol (MAEB), a by-product obtained after FLX oxidation. Additionally, the material achieved specific catalytic activity for the different organic compounds (RhB, MB, or FLX). Therefore, Nb2O5 nanofibers were efficient for degrading three different pollutants under UV light, proving a viable alternative for environmental remediation.
Palavras-Chave: | Ceramic nanofiber; Drug; Electrospinning; Organic pollutant.
Categoria do assunto: | --
Registro original: | Embrapa Instrumentação (CNPDIA)
Exemplares: | CNPDIA - (17959-1) - UPC - AP - DD - PROCI.22/24 -  - 2022/25 - DIS