Chemical and biological immobilization mechanisms of potentially toxic elements in biochar-amended soils
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The application of biochars for the remediation of water and soils contaminated with potentially toxic elements (PTEs) has seen a recent growing interest. The mechanisms of chemical immobilization of PTEs with biochars in aqueous media have been well defined. However, immobilization mechanisms by which biochars interact with PTEs in soil matrix are more complex. The biological immobilization mechanisms and their interactions with PTEs in biochar-amended soils are not as well defined. This review presents an overview of factors governing interactions of biochars with PTEs as well as the synergistic effect of biochars and microorganisms in biological immobilization processes. The effectiveness of biochars in improvement of microbial immobilization of PTEs mainly depends on biochar properties, application rates, and soil environments such as organic matter content, clay type and content, pH and redox potential. Although some modified biochars appear to be better than the pristine biochars for immobilization of PTEs, their potential adverse impacts on soil microbial activity should be considered. This review highlights the most common analytical methods to discover molecular interaction mechanisms between biochar and PTEs and future research areas required for the understanding of biochar-PTE interactions in polluted soil systems.
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Biochar has been widely used as a sorbent for metal and organic contaminant immobilization in soil.
“Biochar has also been widely used as a sorbent for metal and organic contaminant immobilization in soil, whose mechanisms have been thoroughly reviewed (Ahmad et al. 2014; Bandara et al. 2020).”
From Role of biochar toward carbon neutrality (2023) · cites this paper as Bandara et al. 2020
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- Authors
- Bandara, T., Franks, A., Xu, J., Bolan, N., Wang, H., & Tang, C.
- Affiliations
- La Trobe University (AU)
- Zhejiang University (CN)
- University of Newcastle Australia (AU)
- Zhejiang A & F University (CN)
- Corresponding author
- Tang, Caixian
- Venue
- Critical Reviews in Environmental Science and Technology
- Publisher
- Informa UK Limited
- Published
- 2019-08-06
- Volume
- 50
- Issue
- 9
- Pages
- 903-978
- ISSN
- 1064-3389 (ISSN-L)
- 1547-6537
- OpenAlex
- W2964693295
- Cited by
- 289
- References
- 27
- Citations by year
- 2026: 25 · 2025: 36 · 2024: 63 · 2023: 52 · 2022: 51 · 2021: 33 · 2020: 28
- FWCI
- 8.39
- Type
- journal article
- Language
- en
- Open access
- green
- figshare.com
- Licence
- cc-by
- Locations
- Critical Reviews in Environmental Science and Technology (publishedVersion)
- Figshare (submittedVersion, cc-by)
- NOVA (University of Newcastle Australia) (submittedVersion)
- La Trobe University (cc-by)
- Topics
- Physical Sciences › Environmental Science › Pollution › Heavy metals in environment
- Physical Sciences › Environmental Science › Water Science and Technology › Adsorption and biosorption for pollutant removal
- Physical Sciences › Engineering › Biomedical Engineering › Environmental remediation with nanomaterials
- Keywords
- biochar, potentially toxic elements, heavy metal immobilization, chemical immobilization, biochar-amended soil, soil remediation, modified biochar, soil organic matter, clay content, soil pH, redox potential, molecular interaction mechanism
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