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Porphyrin-Based Bio-Sourced Materials for Water Depollution Under Light Exposure.

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Two porphyrins efficiently initiated free-radical photopolymerization (FRP) of soybean oil acrylate (SOA) under visible light. The resulting bio-based materials effectively degraded azo dye in three cycles, showing promise for sustainable depollution.

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Area of Science:

  • Polymer Chemistry
  • Photochemistry
  • Materials Science

Background:

  • Developing efficient photoinitiating systems for free-radical photopolymerization (FRP) is crucial for advanced material synthesis.
  • Bio-based monomers offer sustainable alternatives to petroleum-derived compounds.
  • Visible light-triggered polymerization requires highly effective photoinitiators.

Purpose of the Study:

  • To evaluate porphyrins as photoinitiators for the FRP of soybean oil acrylate (SOA).
  • To investigate the role of co-initiators (tertiary amine, iodonium salt, H-donors) in enhancing photoinitiation efficiency.
  • To explore the application of the resulting bio-based materials in pollutant degradation.

Main Methods:

  • Free-radical photopolymerization (FRP) of soybean oil acrylate (SOA).
  • Photoinitiation studies using porphyrins with various co-initiators (MDEA, Iod, cysteamine, N-acetylcysteine).
  • Electron paramagnetic resonance spin trapping (EPR ST), fluorescence, and laser flash photolysis for mechanistic studies.
  • Photocatalytic degradation of acid red 14 using the synthesized materials.

Main Results:

  • Porphyrin-based systems demonstrated high efficiency for FRP of SOA under visible light irradiation (LEDs at 385, 405, 455, and 530 nm).
  • Acrylate conversions reached up to 96% with efficient radical generation confirmed by EPR ST.
  • The crosslinked, bio-based materials effectively photo-oxidized acid red 14 and maintained efficiency over three depollution cycles.

Conclusions:

  • Porphyrins, combined with suitable co-initiators, are highly efficient photoinitiators for bio-based FRP under visible light.
  • The developed porphyrin-based materials exhibit excellent photocatalytic activity for azo dye degradation.
  • These findings highlight the potential of porphyrin-based systems for sustainable polymer synthesis and environmental remediation.