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Updated: Sep 18, 2025
09:39
Physical, Chemical and Biological Characterization of Six Biochars Produced for the Remediation of Contaminated Sites
Published on: November 28, 2014
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Nano-engineered biochar enhances soil microbial interactions and maize transcriptomic pathways for cadmium
Muhammad Umair Yasin1, Sajid Muhammad1, Nana Chen1
1Zhejiang Key Laboratory of Crop Germplasm, Department of Agronomy, College of Agriculture and Biotechnology, Zhejiang University, Hangzhou 310058, China.
Journal of Hazardous Materials
|June 25, 2025
Summary
Biochar (BC) and nanoparticle (NP) composites effectively immobilize cadmium (Cd) in soil, improving maize growth and resilience. This sustainable strategy enhances soil health and microbial activity for safer agriculture.
Area of Science:
- Environmental Science
- Soil Science
- Nanotechnology
Background:
- Cadmium (Cd) contamination poses significant risks to agroecosystems, impacting soil health, plant stress, and crop yields.
- Sustainable remediation strategies integrating biochar (BC) and nanoparticles (NPs) for Cd immobilization are crucial but underexplored.
Purpose of the Study:
- To evaluate the efficacy of BC, nano-silicon (nSi), and nano-iron (nFe) composites in immobilizing Cd and restoring soil-plant health in contaminated maize fields.
- To investigate the molecular mechanisms of Cd stress mitigation and plant resilience using transcriptomic analysis.
Main Methods:
- Application of varying BC-nSi-nFe formulations to Cd-contaminated soil with maize cultivation.
- Analysis of soil properties, Cd bioavailability, microbial community structure, and maize physiological and transcriptomic responses.
- Specific formulation T6 (BC + 25% nSi + 75% nFe) was identified as optimal.
Main Results:
- The optimal BC-NPs composite (T6) reduced bioavailable Cd by 21%, increased soil pH, and enhanced soil enzyme activities (118-139%).
- Maize biomass increased (115-119%), shoot Cd accumulation decreased by 78%, and oxidative stress was significantly suppressed (67-75% ROS reduction).
- Transcriptomic analysis revealed modulation of antioxidant defense and phytohormone pathways, alongside shifts in microbial networks towards metal resistance and enhanced nitrogen fixation.
Conclusions:
- BC-NPs composites offer a potent, multidimensional strategy for remediating Cd-contaminated soils, integrating nanomaterial science, microbial ecology, and plant molecular biology.
- This approach effectively mitigates Cd toxicity, enhances soil-plant resilience, and promotes sustainable agriculture in affected ecosystems.
- The study provides novel molecular insights into plant stress response and adaptation mechanisms under Cd contamination.
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