Study on the Performance of N-Doped Biochar for Removing Pb2+, Cu2+, and Cr6+from Water

In this study, N-doped straw biochar(N-BC) was prepared using urea for the removal of Pb 2+ , Cu 2+ , and Cr 6+ 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...

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Bibliographic Details
Published in:Water, air, and soil pollution air, and soil pollution, 2024-02, Vol.235 (2), p.130, Article 130
Main Authors: Guo, Hongli, Xu, Jinmei, Zhang, Qiuya, Zhou, Sihai, Song, Jiabao, Wang, Liping
Format: Article
Language:English
Subjects:
Adsorption
Atmospheric Protection/Air Quality Control/Air Pollution
Cations
Charcoal
Climate Change/Climate Change Impacts
Copper
Earth and Environmental Science
Environment
Environmental monitoring
Heavy metals
Hydrogeology
Kinetics
Lead
Metals
Pyrolysis
Removal
Soil Science & Conservation
Surface chemistry
Urea
Water Quality/Water Pollution
X ray photoelectron spectroscopy
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Summary:In this study, N-doped straw biochar(N-BC) was prepared using urea for the removal of Pb 2+ , Cu 2+ , and Cr 6+ 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 Pb 2+ , Cu 2+ , and Cr 6+ was 5, 6, and 2, respectively. Compared to the single biochar, the adsorption of Pb 2+ , Cu 2+ , and Cr 6+ 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 Pb 2+ , Cu 2+ , and Cr 6+ followed quasi-secondary kinetics and the Langmuir model. Mechanistic studies showed that the adsorption mechanism of N-doped biochar for Cu 2+ and Pb 2+ involved surface adsorption, cation-π bonding, and complexation, while that for Cr 6+ 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.
ISSN:0049-6979
1573-2932
DOI:10.1007/s11270-024-06947-3