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Updated: Aug 28, 2026
Physical, Chemical and Biological Characterization of Six Biochars Produced for the Remediation of Contaminated Sites
Published on: November 28, 2014
Insect-derived biochar-organically modified vermiculite composite enabling synergistic adsorption and analysis of
Jiale Sui1, Senlin Duan1, Yuyue Zang1
1Beijing Key Laboratory for Forest Pest Control, College of Forestry, Beijing Forestry University, Beijing, 100083, China.
Background:
The widespread application of insecticides has raised concerns about environmental persistence and risks to non-target organisms, calling for efficient adsorbents and reliable analytical methods for residue monitoring. Biomass-derived carbon-based materials show promise but often suffer from limited capacity and poor reusability. While biochar-clay composites and organically modified clays have been studied separately for pollutant removal, their integration into a synergistic adsorption system remains largely unexplored.
Results:
A novel insect-derived biochar-organically modified vermiculite composite (1.5VB400-91) was developed using fall webworm biomass and vermiculite for the adsorption and determination of five insecticides. The composite achieved a maximum adsorption capacity of 956.06 mg g-1 for thiacloprid and over 80% removal of chlorbenzuron at low concentrations. A dispersive solid-phase extraction method coupled with gas chromatography-electron capture detection was established for garden water samples, showing good linearity (0.30-8000 μg L-1, R2 ≥ 0.9991), low detection limits (0.080-5.4 μg L-1), and satisfactory recoveries (81-91%). Mechanistic studies revealed a synergistic Capture-Transfer-Immobilization process, in which biochar acts as an adsorption entry and mass-transfer accelerator, while organically modified vermiculite serves as the terminal immobilization domain.
Significance:
This work demonstrates the first successful integration of biochar-vermiculite compositing with organic modification to create a synergistic adsorption system enabling both rapid capture and deep fixation of pesticide molecules. The use of pest-derived biomass offers a sustainable and cost-effective fabrication route, while the elucidated Capture-Transfer-Immobilization mechanism provides insights for designing advanced adsorbents for environmental analysis and remediation. The developed method also offers a reliable and sensitive analytical tool for monitoring insecticide residues in environmental water samples.
