Data/hora: 12/06/2024 17:20:08

Biblioteca(s): | Embrapa Instrumentação.
Data corrente: | 27/11/2020
Data da última atualização: | 16/08/2022
Autoria: | PARIS, E. C.; MALAFATTI, J. O. D.; SCIENA, C. R.; NEVES JUNIOR, L. F.; ZENATTI, A.; ESCOTE, M. T.; MOREIRA, A. J.; FRESCHI, G. P. G.
Afiliação: | ELAINE CRISTINA PARIS, CNPDIA.
Título: | Nb2O5 nanoparticles decorated with magnetic ferrites for wastewater photocatalytic remediation.
Ano de publicação: | 2021
Fonte/Imprenta: | Environmental Science and Pollution Research,v. 28, n. 19, 2021.
Páginas: | p. 23731-23741
DOI: | https://doi.org/10.1007/s11356-020-11262-5
Idioma: | Inglês
Conteúdo: | Nanotechnology has been studied on environmental remediation processes to foster greater photocatalysts efficiency and reuse in wastewater. This study investigated the photocatalytic efficiency and viability of niobium pentoxide (Nb2O5) nanoparticles decorated with magnetic ferrite (cobalt ferrite (CoFe2O4) or magnesium ferrite (MgFe2O4)) for atrazine photodegradation. Thus, the decorated Nb2O5 was synthesized by the polymeric precursor method, forming nanoparticles with sizes ranging from 25 to 50 nm. Nanocomposite elementary analyses showed a homogeneous distribution of elements on all particles surface. Efficient magnetic saturation was observed for pure CoFe2O4 (53 emu g−1) and MgFe2O4 (19 emu g−1) nanoparticles, promoting the magnetic removal of Nb2O5:CoFe2O4 and Nb2O5:MgFe2O4 nanocomposites. Photocatalytic assays showed 88% efficiency for atrazine photodegradation with all nanomaterials, which represented a 21% increase compared to photolysis in the 1st cycle. The magnetic nanocomposites when applied to a 5th cycle maintained the atrazine photodegradation activity. In this way, magnetic Nb2O5-based nanocomposites decorated with ferrite nanoparticles showed an efficient photocatalytic response, in addition to posterior magnetic removal from the aqueous medium. Therefore, the evaluated magnetic Nb2O5 nanocomposites may be an alternative to enhance the wastewater removal process and foster the reuse in advanced oxidative processes.
Palavras-Chave: | Cobalt ferrite; Magnesium ferrite; Niobiumpentoxide magnetic nanocomposite.
Categoria do assunto: | --
Registro original: | Embrapa Instrumentação (CNPDIA)
Exemplares: | CNPDIA - (17663-1) - UPC - AP - DD - PROCI.20/135 -  - 2020/0143 - DIS