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Updated: Nov 6, 2025
Physical, Chemical and Biological Characterization of Six Biochars Produced for the Remediation of Contaminated Sites
Published on: November 28, 2014
Cd immobilization and soil quality under Fe-modified biochar in weakly alkaline soil
Tong Sun1, Yingming Xu1, Yuebing Sun1
1Key Laboratory of Original Agro-Environmental Pollution Prevention and Control, Ministry of Agriculture, Ministry of Agriculture and Rural Affairs (MARA), Tianjin, 300191, China; Tianjin Key Laboratory of Agro-Environment and Agro-Product Safety, Agro-Environmental Protection Institute, MARA, Tianjin, 300191, China.
Fe-modified biochar effectively remediates cadmium-contaminated soil by improving soil structure, reducing cadmium bioavailability, and enhancing microbial diversity. This cost-effective method offers a sustainable solution for agricultural soil restoration.
Area of Science:
- Environmental Science
- Soil Science
- Agricultural Chemistry
Background:
- Cadmium (Cd) contamination in agricultural soils poses a significant threat to food safety and environmental health.
- Effective and sustainable remediation strategies are crucial for large-scale agricultural soil management.
- Iron (Fe)-modified biochar presents a promising amendment for soil remediation due to its unique properties.
Purpose of the Study:
- To investigate the efficacy of Fe-modified biochar in remediating weakly alkaline Cd-contaminated soil.
- To assess the impact of Fe-modified biochar on Cd bioavailability, soil properties, and maize uptake.
- To evaluate the effects on soil microbial community composition and enzyme activities.
Main Methods:
- Field experiments were conducted using Fe-modified biochar on Cd-contaminated soil.
- Evaluated soil aggregate distribution, stability, and organic carbon content.
- Measured DTPA-extractable Cd, sequential extraction of Cd fractions, and Cd accumulation in maize varieties.
- Assessed soil enzyme activities (catalase, urease, alkaline phosphatase) and microbial community diversity (OTUs, Shannon, Chao1, ACE indices).
Main Results:
- Fe-modified biochar significantly improved soil aggregate structure and stability, increasing soil organic carbon.
- DTPA-Cd concentration decreased by 37.74%-41.65%, with Cd shifting from acid-soluble/reducible to oxidizable/residual fractions.
- Cd accumulation in maize was reduced by 41.31%-76.64% across three varieties.
- Soil enzyme activities and bacterial richness/diversity (OTUs, Shannon, Chao1, ACE) were significantly enhanced.
Conclusions:
- Fe-modified biochar is a highly effective agent for remediating Cd-contaminated agricultural soils.
- It improves soil physical properties, reduces Cd bioavailability, and enhances soil biological health.
- This amendment offers a cost-effective and environmentally friendly solution for sustainable soil management.
