| Issue |
E3S Web Conf.
Volume 717, 2026
2026 8th International Conference on Environmental Prevention and Pollution Control Technologies (EPPCT 2026)
|
|
|---|---|---|
| Article Number | 02018 | |
| Number of page(s) | 4 | |
| Section | Soil, Sediment and Ecological Environment | |
| DOI | https://doi.org/10.1051/e3sconf/202671702018 | |
| Published online | 05 June 2026 | |
Dynamic Immobilization of Copper in Mining Soils Using Modified Biochars
1 School of Resources and Environmental Engineering, Wuhan University of Technology, Wuhan, Hubei 430070, China
2 Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi, Xinjiang 830011, China
3 School of Environmental Science and Engineering, Southern University of Science and Technology, Shenzhen, Guangdong 518055, China
* Corresponding author: This email address is being protected from spambots. You need JavaScript enabled to view it.
Abstract
This study investigated the dynamic passivation effects of pristine pine wood biochar (BC) and three modified biochars (BC-OH, BC-Mn, and BC-Mg) on copper (Cu)-contaminated soil from a mining area. Based on the Community Bureau of Reference (BCR) sequential extraction and Risk Assessment Code (RAC) analysis, the modified biochars significantly outperformed pristine BC, exhibiting a substantial reduction in the highly toxic weak acid-soluble fraction (F1) of Cu. Speciation evolution analysis revealed that different modifications drove distinct immobilization mechanisms, characterized by either a unidirectional (BC-Mg and BC-OH) or a two-step (BC-Mn) transformation process. The long-term passivation efficacy of the materials followed the order: BC-Mg > BC-Mn > BC-OH ≫ BC. Notably, the optimal material, BC-Mg, achieved a nearly 75% reduction in the F1 fraction after 70 days, demonstrating its potential as an ideal remediation material for the long-term mitigation of acute heavy metal toxicity.
© The Authors, published by EDP Sciences, 2026
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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