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Microbial Bioremediation of Pesticides01:28

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Pesticides often feature structurally complex chemical architectures, incorporating halogen groups and multiple aromatic rings. These characteristics confer high chemical stability, rendering many pesticides resistant to natural degradation processes. This resistance poses significant environmental concerns, as persistent pesticide residues can accumulate in ecosystems and affect non-target organisms.Despite the inherent stability of many pesticides, certain microorganisms possess the metabolic...

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Metolachlor adsorption using walnut shell biochar modified by soil minerals.

Lu Liu1, Xiaohan Li2, Xiaorou Wang3

  • 1Key Laboratory of Agricultural Renewable Resource Utilization Technology of Heilongjiang Province, Northeast Agricultural University, No.600 Changjiang Road, Xiangfang District, Harbin, 150030, China; School of Resources and Environment, Northeast Agricultural University, No.600 Changjiang Road, Xiangfang District, Harbin, 150030, China; School of Environment, Harbin Institute of Technology, No.73, Huanghe Road, Nangang District, Harbin, 150090, China.

Environmental Pollution (Barking, Essex : 1987)
|June 14, 2022
PubMed
Summary

Mineral modification of walnut shell biochar (BC) significantly enhances its ability to remove the pesticide metolachlor (MET) from soil. This improved biochar offers a stable, cost-effective solution for pesticide residue remediation.

Keywords:
AdsorbentBiocharMineralsStability

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Area of Science:

  • Environmental Chemistry
  • Materials Science
  • Soil Science

Background:

  • Pesticide residues in soil pose environmental risks.
  • Biochar is a potential adsorbent for contaminants.
  • Developing efficient biochar-based remediation strategies is crucial.

Purpose of the Study:

  • To investigate the adsorption of metolachlor (MET) by walnut shell biochar (BC) modified with montmorillonite, illite, and kaolinite.
  • To evaluate the impact of mineral modification on biochar stability and adsorption performance.
  • To elucidate the adsorption mechanisms and kinetics of MET on modified biochar.

Main Methods:

  • Synthesis and characterization of original biochar (OBC) and mineral-modified biochars (MBC, IBC, KBC) using SEM, FTIR, XRD, and TGA.
  • Batch adsorption experiments to assess the effects of dosage, ionic strength, and pH.
  • Analysis of adsorption kinetics and isotherms.
  • Response surface methodology for model analysis and mechanism investigation.

Main Results:

  • Mineral modification enhanced the thermal and chemical stability of biochar, with montmorillonite-modified biochar (MBC) showing the highest stability.
  • MET adsorption rates were significantly higher for modified biochars (MBC: 92.47%, IBC: 87.97%, KBC: 83.31%) compared to OBC (62.15%).
  • Maximum MET adsorption capacities were substantially increased by mineral modification (MBC: 68.49 mg g⁻¹, IBC: 65.79 mg g⁻¹, KBC: 65.36 mg g⁻¹) compared to OBC (39.68 mg g⁻¹).

Conclusions:

  • Mineral-modified biochars exhibit superior adsorption rates and stability for metolachlor removal.
  • Enhanced physical adsorption, driven by hydrogen bonds, π-π bonds, coordination bonds, and hydrophobic interactions, is the primary mechanism.
  • Mineral-modified biochar presents a promising, cost-effective soil amendment for efficient pesticide residue remediation.