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  3. The Impact Of Microplastics On The Adsorption Of 2,4,6-tribromophenol In Soils: Competitive Adsorption.
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  3. The Impact Of Microplastics On The Adsorption Of 2,4,6-tribromophenol In Soils: Competitive Adsorption.

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The impact of microplastics on the adsorption of 2,4,6-tribromophenol in soils: Competitive adsorption.

Guoyu Ding1, Yuxin Wei1, Yuqiao Fan2

  • 1Beijing Key Laboratory of Aqueous Typical Pollutants Control and Water Quality Safeguard, Beijing Jiaotong University, Beijing 100044, PR China.

Ecotoxicology and Environmental Safety
|June 3, 2025

View abstract on PubMed

Summary
This summary is machine-generated.

Microplastics (MPs) in soil reduce the adsorption of 2,4,6-tribromophenol (TBP), increasing its mobility and potential groundwater risk. Aged MPs showed a slightly weaker inhibitory effect on TBP adsorption compared to new MPs.

Keywords:
2,4,6-tribromophenolAdsorptionMicroplasticsPolyethyleneSoil

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Area of Science:

  • Environmental Science
  • Soil Science
  • Environmental Chemistry

Background:

  • Soil acts as a significant sink for microplastics (MPs).
  • Interactions between MPs, soil, and organic contaminants like 2,4,6-tribromophenol (TBP) are complex and not fully understood.
  • Understanding these interactions is crucial for assessing contaminant transport and environmental risk.

Purpose of the Study:

  • To investigate the effect of polyethylene (PE) microplastics on the adsorption behavior of 2,4,6-tribromophenol (TBP) in soil.
  • To evaluate how aged polyethylene (APE) microplastics influence TBP adsorption and desorption.
  • To explore the factors affecting TBP adsorption in the presence of MPs, including pH, MP dosage, and ionic strength.

Main Methods:

  • Adsorption kinetics and isotherm studies were conducted using soils with and without PE and APE (1% w/w).
  • TBP desorption efficiency was measured from soil samples containing MPs.
  • Density Functional Theory (DFT) calculations were used to analyze adsorption energies and interaction forces.
  • The influence of environmental pH, MP dosage, and ionic strength on TBP adsorption was examined.

    • Main Results:

    • The presence of PE and APE in soil significantly reduced TBP adsorption capacity by approximately 29-32%.
    • TBP desorption efficiency was higher in soils containing PE and APE compared to pure soil, indicating increased mobility.
    • TBP adsorption decreased with increasing environmental pH, MP dosage, and ionic strength.
    • DFT calculations revealed that MPs compete with TBP for adsorption sites on soil particles, with interactions primarily driven by van der Waals forces.

    Conclusions:

    • Microplastics in soil inhibit TBP adsorption, enhancing its mobility and posing a greater risk to groundwater resources.
    • Aged microplastics exhibited a weaker inhibitory effect than virgin PE due to increased negative surface charge from oxidation, leaving more sites available for TBP adsorption.
    • Environmental factors such as pH, MP concentration, and ionic strength modulate the adsorption behavior of TBP in microplastic-contaminated soils.