Abstract
The aim of this paper was to investigate the remediation effect of polyethyleneimine-modified biochar (PBC400) on Cd-contaminated soil. Biochar was prepared from tobacco straws, and polyethyleneimine (PEI) was loaded on the biochar surface to produce PBC400. The prepared PBC400 was characterized by Scanning electron microscopy (SEM), Fourier Transform Infrared Spectroscopy (FTIR), and X-ray diffraction (XRD) analyses. During the soil incubation, soil samples were collected three times at 30, 60 and 90 days, and the physical and chemical properties of soil and the contents of heavy metals were determined after natural drying. When the PBC400 addition amount was 3% and the soil was cultured for 90 days, the remediation effect was optimal. The pH increased by 0.52 units, the cation exchange capacity (CEC), available phosphorus and potassium contents increased by 30%, 43% and 39%, respectively, the available Cd content in the soil decreased by 54.36%, the weak acid extractable Cd content decreased by 35.36%, and the residual Cd content increased by 184.67%. The results indicate that PBC400 can be used to remediate heavy metal-contaminated soil and reduce the bioavailability, migration, and transformation ability of Cd.
Highlights
Biochar and polyethyleneimine-modified biochar (PBC400) improved the physical and chemical properties of soils.
PBC400 had the best remediation effect on Cd-contaminated soil.
The lowest content of available Cd was for PBC400 addition of 3% and soil cultured for 90 days.
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Data Availability
The datasets used and/or analyzed during the study are available from the corresponding author upon reasonable request.
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Experiment: Haihua Li, Yuanyuan Qu; Biochar preparation: Zhichen Wang, Minghao Xie; Original draft preparation: Haihua Li, Yuanyuan Qu, Zhichen Wang, and Minghao Xie; Review and editing: Haihua Li, Yuanyuan Qu.
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Li, H., Qu, Y., Wang, Z. et al. Remediation of Cd-Contaminated Soil by Polyethyleneimine-Modified Biochar. Environ. Process. 10, 29 (2023). https://doi.org/10.1007/s40710-023-00647-6
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DOI: https://doi.org/10.1007/s40710-023-00647-6