Abstract
In this study, N-doped straw biochar(N-BC) was prepared using urea for the removal of Pb2+, Cu2+, and Cr6+ from water. SEM, FT-IR, XRD, and XPS characterization analyses demonstrated the successful loading of N onto the biochar. The adsorption performance of the N-doped biochar was evaluated by orthogonal and single-factor experiments. The results showed that the magnitude of the effect on the adsorption of the three heavy metals was consistent with initial pH > dosing > pyrolysis temperature. In addition, the optimum initial pH for the adsorption of Pb2+, Cu2+, and Cr6+ was 5, 6, and 2, respectively. Compared to the single biochar, the adsorption of Pb2+, Cu2+, and Cr6+ by N-doped biochar increased from 6.33, 4.25, and 3.78 mg/g to 30.2, 16.28, and 14.53 mg/g. The adsorption of Pb2+, Cu2+, and Cr6+ followed quasi-secondary kinetics and the Langmuir model. Mechanistic studies showed that the adsorption mechanism of N-doped biochar for Cu2+ and Pb2+ involved surface adsorption, cation-π bonding, and complexation, while that for Cr6+ included electrostatic attraction and reduction. The reusability and excellent adsorption properties of the surface N-doped biochar from cycling experiments indicate that biochar is a good material for the removal of heavy metals from water.
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Acknowledgements
This work was supported by the National Natural Science Foundation of China under grants (No.21477050), and the International Scientific and Technological Cooperation in Changzhou (CZ20140017). Besides, the author would like to thank the Analysis and Testing Center of Changzhou University[http://atc.cczu.edu.cn/main.htm] for their help in FT-IR, BET, and XRD testing and Shiyanjia Lab [www.shiyanjia.com] for related testing works on XPS.
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Hongli Guo: Conceptualization, Methodology, Formal analysis, Writing—original draft. Jinmei Xu: Visualization, Formal analysis. Qiuya Zhang: Visualization, Formal analysis. Sihai Zhou: Data curation, Visualization. Jiabao Song: Investigation, Visualization. Liping Wang: Resources, Writing – review & editing, Supervision, Project administration.
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Guo, H., Xu, J., Zhang, Q. et al. Study on the Performance of N-Doped Biochar for Removing Pb2+, Cu2+, and Cr6+from Water. Water Air Soil Pollut 235, 130 (2024). https://doi.org/10.1007/s11270-024-06947-3
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DOI: https://doi.org/10.1007/s11270-024-06947-3