Multiwall carbon nanotubes functionalized with 13.8(6) nm maghemite nanoparticles (NPs) have been synthesized by a modified co-precipitation chemical route and characterized using N2 physisorption and in-field 57Fe Mössbauer studies. Textural and hyperfine magnetic properties indicated that this nanohybrid has a strong potential to be applied in magnetic remediation process due to their unique surface features. Moreover, acute toxicity evaluations were performed before in situ applications, where we implemented our nanohybrid in an effluent containing young Daphnia magna biomarker having a mortality percentage not higher than 15% for the selected concentrations. Despite of it, the reproduction rate was affected after two weeks of previous 72 h exposure, but without apparent morphological changes according to optical and scanning electron microscopy. These findings are of crucial interest for long term applications of concentrated NPs in polluted effluents.
Bibliographical noteFunding Information:
The authors acknowledge the Vicerrectorado de Investigación y Posgrado (VRIP) de la Universidad Nacional Mayor de San Marcos for supporting this work, project code B2113002i-MINEDU-2021. Edson C. Passamani would also like to thank FAPES and CNPq for their financial support. Finally, the authors thank to Jean-Marc Greneche for supporting us with in-field Fe Mössbauer measurements of the JA1 sample. 57
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- D. magna
- Ecotoxicological properties
- In-field Mössbauer
- Multiwall carbon nanotubes