Carbon nitride nanosheets magnetically decorated with Fe3O4 nanoparticles by homogeneous precipitation : adsorption-photocatalytic performance and acute toxicity assessment
In the present study, graphitic carbon nitride (g-C3N4) was decorated with Fe3O4 nanoparticles by using an alternative, simple and environmentally friendly method of homogeneous precipitation with urea. The magnetic nanocomposite was characterized by transmission electron microscopy (TEM), scanning...
| Main Authors: | Rosa, Eliane V., Fascineli, Maria L., Silva, Izabel C. R. da, Rodrigues, Marcelo O., Chaker, Juliano Alexandre, Grisolia, Cesar Koppe, Moya, Sergio E., Campos, Alex F. C., Sousa, Marcelo Henrique |
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| Format: | Artigo |
| Language: | Inglês |
| Published: |
Elsevier B. V.
2021
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| Subjects: | |
| Online Access: |
https://repositorio.unb.br/handle/10482/42160 https://doi.org/10.1016/j.enmm.2021.100549 |
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| Summary: |
In the present study, graphitic carbon nitride (g-C3N4) was decorated with Fe3O4 nanoparticles by using an alternative, simple and environmentally friendly method of homogeneous precipitation with urea. The magnetic nanocomposite was characterized by transmission electron microscopy (TEM), scanning electron microscopy (SEM-EDS), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), X-ray photoelectron spectroscopy (XPS), Brunauer–Emmett–Teller isotherms (BET), Zetametry, vibrating sample magnetometry, UV–vis absorption spectroscopy, and photoluminescence spectroscopy (PL). The acute toxicological effects of nanomaterials were evaluated in embryos/larvae of the zebrafish (Danio rerio). The performance of the nanocomposite for removal of methylene blue (MB), as a model pollutant, from water in different pH conditions was compared to that of pure g-C3N4 and a magnetic composite elaborated using conventional coprecipitation with NH4OH. The results showed that the nanocomposite synthesized with the new approach showed the best performance, corresponding to a removal rate of 98.3% in the alkaline medium. Regeneration studies showed that the proposed nanocomposite can be easily recovered by magnetic assistance and can be reused, keeping a good removal efficiency. The toxicological results showed that nanomaterials, pure and decorated, presented no acute toxicological effects in zebrafish at the concentrations recommended by OECD 236. |
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