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PDMS Membrane Using Phenyl as Rigid Molecular Spacer for Phenol Recovery.

Xiangyan Li1,2, Yan Zhuang1,2, Chang Liu3

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|June 20, 2025
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Summary
This summary is machine-generated.

This study enhances polydimethylsiloxane (PDMS) membranes for volatile organic compound (VOC) removal by introducing phenyl spacers, significantly improving phenol diffusion and separation performance.

Keywords:
pervaporationphenolphenylpolydimethylsiloxanethiol‐ene

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Separation Science

Background:

  • Polydimethylsiloxane (PDMS) membranes face limitations in removing volatile organic compounds (VOCs) due to restricted molecular diffusion.
  • Improving molecular transport is crucial for enhancing PDMS membrane efficiency in separating aromatic compounds.

Purpose of the Study:

  • To design a high-efficiency diffusion channel in PDMS by incorporating phenyl spacers.
  • To optimize PDMS-based membranes for superior volatile organic compound (VOC) removal, specifically phenol recovery.

Main Methods:

  • Chemically crosslinking thiol-grafted PDMS (thiol-PDMS) with divinylbenzene and vinyl-terminated PDMS (vinyl-PDMS) via thiol-ene click reaction.
  • Introducing phenyl groups as spacers within the PDMS matrix to enlarge free volume and facilitate diffusion.
  • Optimizing parameters including divinylbenzene content, pervaporation temperature, photoinitiator concentration, and vinyl-PDMS viscosity.

Main Results:

  • The introduction of divinylbenzene as a spacer significantly increased the free volume radius, enhancing phenol diffusion.
  • The optimized phenyl-PDMS membrane achieved a separation factor of 10.9 and a flux of 3959.66 g m⁻² h⁻¹ for 0.1 wt% phenol/water solution at 70°C.
  • The enhanced phenyl-PDMS membrane demonstrated a 2.05-fold increase in separation factor and a 3.54-fold increase in flux compared to unmodified PDMS.

Conclusions:

  • The developed phenyl-PDMS membrane offers an effective structural design for aromatic compound removal by enlarging diffusion channels.
  • This advancement significantly improves pervaporation (PV) performance for phenol recovery, surpassing unmodified PDMS.
  • The study provides a valuable contribution to bio-medicine and bioengineering through enhanced separation technologies.