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Remediation of Pb-Contaminated Soil Using a Novel Magnetic Nanomaterial Immobilization Agent

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Abstract

The management of heavy metal contaminated soil has received extensive research attention. In this study, a novel immobilization agent (SiO2@Fe3O4@C-COOH) was combined with traditional immobilization agents (TIAs), i.e., CaO, organic matter (OM), and calcium superphosphate (CSP), and used to remediate Pb-contaminated soil. The immobilization effects of Pb in soil was evaluated through pot experiments involving wheat cultivation. The results indicated that SiO2@Fe3O4@C-COOH delivered a higher Pb immobilization efficiency than did TIAs such as CaO, OM, and CSP. The application of SiO2@Fe3O4@C-COOH in combination with TIAs (CaO, OM, and CSP) synergistically enhanced the Pb immobilization efficiency of the soil to 85.10%. Further, joint application in a 54.19% reduction of Pb content in wheat roots, a 65.78% reduction in stems, and a 47.96% in leaves. Thus, the combined application of SiO2@Fe3O4@C-COOH and TIAs significantly reduced the bioavailability of Pb, achieved the purpose of Pb stabilization and soil remediation, and has the potential for wide-spread application in the remediation of Pb-contaminated soils.

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Acknowledgements

This work was supported by the Henan Province Key R&D and Promotion Projects (Grant No. 212102310063), National Natural Science Foundation of China (Grant No. 41501527).

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Correspondence to Chuang Ma.

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Liu, F., Su, Y., Ma, C. et al. Remediation of Pb-Contaminated Soil Using a Novel Magnetic Nanomaterial Immobilization Agent. Bull Environ Contam Toxicol 108, 315–323 (2022). https://doi.org/10.1007/s00128-021-03376-4

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  • DOI: https://doi.org/10.1007/s00128-021-03376-4

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