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Insight into microplastic-derived DOM modulation of interfacial reactive pathways in covalent triazine framework

Chao Zhu1, Hao Liu2, Kuan Sun3

  • 1Zhejiang Key Laboratory of Low-carbon Control Technology for Industrial Pollution, College of Environment, Zhejiang University of Technology, Hangzhou, 310032, China; State Key Laboratory of Green Chemical Synthesis and Conversion, Zhejiang University of Technology, Hangzhou, 310014, China.

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Microplastic-derived dissolved organic matter (MP-DOM) can enhance photocatalysis. Polyethylene terephthalate DOM (PET-DOM) specifically boosts reactive oxygen species (ROS) production, improving pollutant degradation by novel catalysts.

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Area of Science:

  • Environmental Chemistry
  • Materials Science
  • Photocatalysis

Background:

  • Dissolved organic matter (DOM) influences water treatment processes.
  • The impact of microplastic-derived DOM (MP-DOM) on photocatalysis is not well understood.
  • Understanding DOM's role is crucial for effective water purification.

Purpose of the Study:

  • To investigate the component-specific effects of different DOM types on photocatalyst performance.
  • To develop a DOM-resilient photocatalyst for degrading pollutants like bisphenol A (BPA) and naphthalene (NAP).
  • To elucidate the mechanisms by which MP-DOM modulates photocatalytic activity.

Main Methods:

  • Synthesis of a nitrogen-vacancy engineered covalent triazine framework (NV-CTF-0.03) photocatalyst.
  • Assessing photocatalytic degradation of BPA and NAP in the presence of humic acid (HA) and various MP-DOMs (PE-, PS-, PET-DOM).
  • Utilizing 3D excitation-emission matrix fluorescence with fluorescence regional integration (3D EEM-FRI), electron transfer capacity measurements, and density functional theory (DFT) calculations.

Main Results:

  • NV-CTF-0.03 demonstrated resilience to DOM interference and enhanced pollutant degradation.
  • Humic acid (HA) suppressed photocatalysis, while polyethylene terephthalate DOM (PET-DOM) significantly promoted it.
  • PET-DOM enhanced •O2- production via π-π interactions and defect-site coordination, improving electron transfer.

Conclusions:

  • PET-DOM acts as a specific photochemical mediator, enhancing photocatalysis through dual pathways.
  • The study provides mechanistic insights into DOM-photocatalyst interactions.
  • Findings guide the design of robust photocatalysts for complex aquatic environments.