Abstract
Sewage sludge-derived biochar (SSB) was prepared at 600 °C pyrolysis temperature and modified by co-precipitation with Fe3O4 to obtain Fe3O4@SSB. The adsorption process of U(VI) onto the Fe3O4@SSB was accurately described by the pseudo-second order and Langmuir isotherm model. The maximum removal capacity of U(VI) was 149.15 mg/g at 303 K and initial pH of 4.0 by Langmuir isotherm model analysis. The removal mechanisms included complexation, ion exchange, reduction and electrostatic attraction. The U(VI) removal efficiency by Fe3O4@SSB remained above 90% after five adsorption–desorption. This work provided a reference for sewage sludge resource utilization and biochar modification for uranium-containing wastewater treatment.
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Acknowledgements
This work was supported the Open Funding for Innovation Platform of Education Department in Hunan Province (19K081) and Research Program for Young Backbone Scholar in Hunan Province (XJT[2018]574). The authors thank the permissions from Hengyang Water Group for providing sewage sludge to prepare the biochar in this study.
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Mo, G., Hu, Q., Wang, G. et al. Fe3O4-modified sewage sludge biochar for U(VI) removal from aqueous solution: performance and mechanism. J Radioanal Nucl Chem 329, 225–237 (2021). https://doi.org/10.1007/s10967-021-07782-0
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DOI: https://doi.org/10.1007/s10967-021-07782-0