Abstract
N-doped carbon fibers (NCFs) were in situ prepared by Camellia sinensis branches waste through hydrothermal carbonization with urea/ZnCl2 at 160–280 °C under 0.8–8.9 MPa. The structural characteristics of NCFs were investigated by elemental analysis, SEM, TEM, XRD, XPS, Raman spectra, and BET surface area. The highest N content of NCFs obtained at 280 °C was 8.96%, and the main forms of doped N were pyridinic N, pyrrolic N, and graphitic N. Moreover, NCFs were applied to remove metal ions successfully. The results showed that NCF-240 had the maximum adsorption amounts of 106.52, 125.23, and 153.49 mg/g for Cu2+, Pb2+, and Zn2+, respectively, while NCF-280 had the best removal ability on Cr6+ (145.67 mg/g). Finally, it demonstrated that the adsorption behavior of NCFs was well fitted by the pseudo-second-order kinetic and the Langmuir adsorption isotherm models.
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Acknowledgements
The authors thank the Key Research and Development Program of Shaanxi (2021ZDLNY04-03) and the Agricultural Special Fund Project of Shaanxi Province (NYKJ-2021-YL(XN)20) for supporting this work.
Funding
This work was supported by the Key Research and Development Program of Shaanxi (2021ZDLNY04-03) and the Agricultural Special Fund Project of Shaanxi Province (NYKJ-2021-YL(XN)20).
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Shasha Guo conducted all experimental works, collected and analyzed the data, and wrote the first draft; Yubo Liu assisted the first author in experiments; Weiguo Zhang and Yancheng Wang prepared the material and collect the data; Bin Xiao contributed to the investigation, validation, and proofread the draft; Yuefang Gao conceived the idea, interpreted the data, and proofread the final manuscript. All the authors read and approved the final manuscript.
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Guo, S., Liu, Y., Zhang, W. et al. N-doped carbon fibers in situ prepared by hydrothermal carbonization of Camellia sinensis branches waste for efficient removal of heavy metal ions. Environ Sci Pollut Res 29, 88951–88961 (2022). https://doi.org/10.1007/s11356-022-21923-2
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DOI: https://doi.org/10.1007/s11356-022-21923-2