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Flash Graphene from Plastic Waste.

Wala A Algozeeb1, Paul E Savas1, Duy Xuan Luong1

  • 1Department of Chemistry, Rice University, 6100 Main Street, Houston, Texas 77005, United States.

ACS Nano
|October 29, 2020
PubMed
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This study presents a flash Joule heating (FJH) method to upcycle plastic waste into high-quality flash graphene (FG). This catalyst-free process is energy-efficient and suitable for mixed plastic waste, offering an environmentally beneficial recycling solution.

Area of Science:

  • Materials Science
  • Chemical Engineering
  • Environmental Science

Background:

  • Plastic waste poses a significant environmental challenge, necessitating innovative upcycling strategies.
  • Graphene production often involves complex processes and catalysts, limiting scalability and economic viability.
  • Developing sustainable methods to convert waste materials into valuable products is crucial for a circular economy.

Purpose of the Study:

  • To present a novel approach for upcycling plastic waste (PW) into flash graphene (FG) using flash Joule heating (FJH).
  • To characterize the properties of the produced FG and evaluate the economic and environmental feasibility of the process.
  • To explore the potential of this method for large-scale plastic waste management.

Main Methods:

Keywords:
compositesgraphenemicroplasticsplastic wasterecyclingupcycling

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  • Utilizing flash Joule heating (FJH) with sequential alternating current (AC) and direct current (DC) flashes to convert plastic waste into flash graphene.
  • Characterizing the synthesized flash graphene using Raman spectroscopy, transmission electron microscopy, and X-ray diffraction.
  • Analyzing the co-products, including carbon oligomers and gaseous hydrocarbons, using Fourier transform infrared spectroscopy and gas-phase analysis.

    • Main Results:

    • High-quality flash graphene (FG) with an I2D/IG peak ratio up to 6 was produced from plastic waste.
    • The FJH process is catalyst-free, energy-efficient (∼23 kJ/g), and effective for mixed plastic waste, including landfill materials.
    • The turbostratic FG exhibits a large interlayer spacing (3.45 Å), facilitating dispersion in liquids and composites up to 1.2 mg/mL.
    • Co-products include carbon oligomers similar to the starting plastic and valuable hydrogen and light hydrocarbons.

    Conclusions:

    • Flash Joule heating offers an economically attractive and environmentally beneficial method for upcycling plastic waste into high-value flash graphene.
    • The catalyst-free nature and suitability for mixed waste streams make this process highly applicable for industrial-scale plastic recycling.
    • The produced flash graphene's properties and dispersibility suggest potential applications in various composite materials and liquid dispersions.