Abstract
In this study, Fe–N co-doped carbon nanotubes (Fe–N-CNTs) were prepared and used to activate peroxymonosulfate (PMS) for advanced oxidation removal of Rhodamine B (RhB). The XRD, XPS, SEM and EDS results revealed that the Fe, N, O co-doped carbon nanotubes (Fe–N-CNTS) coated with FeO(OH) nanosheets were successfully synthesized by a simple pyrolyzing process. The large BET specific surface area (286.42 m2/g) and hybrid pore structure of micropores and mesopores (3–10 nm) of the Fe–N-CNTS ensured its good RhB degradation performance (98% in 30 min) by activatting PMS. The Fe–N-CNTS-1.5 had the best degradation performance, which could be attributed to the synergy effect between FeO(OH) nanosheets and Fe–N-CNTS. The 1O2, O2•, •OH and SO4−• were formed during the PMS activating process and involved in the RhB degradation. The reaction constant of 0.5483 min−1 could be obtained by adding 1.5 mM PMS, which is about 12 and 24 times of the reaction constant of PMS only (0.0458 min−1) and FeN-CNTS only (0.0226 min−1), respectively. This work provides new insight into the mechanism of PMS activation by carbon-based catalysts for the efficient degradation of RhB.
Data availability
The data supporting the findings of this paper are available from the corresponding author upon request.
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Acknowledgements
This work has been supported by the Fundamental Research Funds for the Central Universities (2019XKQYMS02).
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C, Q. F. and L.G. proposed and supervised the project. W. C, J. F. and Y. W. conceived and performed the experiments. W. C, J. F., Q. F. and L. G. wrote the paper. All the authors contributed to the results analyses, discussions, and have approved the final version of the paper.
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Cui, W., Fang, J., Wan, Y. et al. Fast degradation of rhodamine B by peroxymonosulfate activated with Fe–N carbon nanotubes. J Nanopart Res 25, 171 (2023). https://doi.org/10.1007/s11051-023-05812-4
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DOI: https://doi.org/10.1007/s11051-023-05812-4