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Nb2O5 nanoparticles decorated with magnetic ferrites for wastewater photocatalytic remediation

  • Advanced Oxidation/Reduction Technologies: An Perspective from Iberoamerican Countries
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Abstract

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.

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Funding

The authors acknowledge Embrapa grant no. 03.11.01.027.00.00, SisNano/MCTIC, CNPq grant no. 444117/2014-8, AgroNano Network, and CAPES grant no. 88887.368533/2019-00, Code 001 for financial support.

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Contributions

Elaine Cristina Paris: Writing, conceptualization, and supervision; João Otávio Donizette Malafatti: Writing and methodology; Camila Rodrigues Sciena: Methodology; Luiz Ferreira Neves Junior: Methodology; Alessandra Zenatti: Methodology; Márcia Tsuyama Escote: Methodology; Ailton José Moreira: Writing and Methodology; Gian Paulo Giovanni Freschi: Writing—review and editing.

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Correspondence to Elaine Cristina Paris.

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Responsible Editor: Sami Rtimi

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Paris, E.C., Malafatti, J.O.D., Sciena, C.R. et al. Nb2O5 nanoparticles decorated with magnetic ferrites for wastewater photocatalytic remediation. Environ Sci Pollut Res 28, 23731–23741 (2021). https://doi.org/10.1007/s11356-020-11262-5

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  • DOI: https://doi.org/10.1007/s11356-020-11262-5

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