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Separation and Identification of Conventional Microplastics from Farmland Soils
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Removal of Polyethylene Microplastics Using Wood Sawdust.

Julie Sentman1, Ian Eggleston1, Xiupei Zhou1

  • 1Stockbridge School of Agriculture, University of Massachusetts, Amherst, Massachusetts, USA.

Water Environment Research : a Research Publication of the Water Environment Federation
|May 18, 2026
PubMed
Summary

Wood sawdust effectively removes microplastics (MPs) from water. Both unmodified and modified sawdust achieved over 99% efficiency, offering a low-cost solution for water purification and environmental remediation.

Keywords:
flowthrough captureintermolecular interactionsmicroplasticspolyethylenepolyphenolsremoval strategy

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Area of Science:

  • Environmental Science
  • Materials Science
  • Chemical Engineering

Background:

  • Microplastics (MPs) pose significant environmental and health risks.
  • Limited scalable and cost-effective MP removal technologies exist.
  • Aquatic systems are major reservoirs for microplastic pollution.

Purpose of the Study:

  • To investigate wood sawdust as a low-cost material for microplastic remediation.
  • To compare the efficacy of unmodified (UMSD) and chemically modified (MSD) sawdust for polyethylene (PE) MP removal.
  • To elucidate the mechanisms of microplastic capture by sawdust.

Main Methods:

  • Synthesis of modified sawdust (MSD) using tannic acid and ferric chloride.
  • Fixed-bed column experiments for MP removal.
  • Analysis of removal efficiency for different PE MP sizes (40 and 150 μm).

Main Results:

  • Both UMSD and MSD achieved over 99% removal efficiency for PE microplastics.
  • Physical entrapment was identified as the primary capture mechanism.
  • Van der Waals forces likely contributed to the secondary capture mechanism.

Conclusions:

  • Lignocellulosic biowaste, like wood sawdust, shows significant potential for microplastic capture.
  • The findings support the development of regenerative, low-cost materials for water purification.
  • Further research is warranted to explore interactions with diverse contaminant classes.