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Related Concept Videos

Polymer Classification: Architecture01:14

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Polymers are classified as linear or branched on the basis of their chain architecture. The polymer chains in linear polymers have a long chain-like structure with minimal to no branching at all. Even if a polymer features large substituent groups on the monomer, which appear as branches to the skeleton, it is not considered a branched polymer. A branched polymer contains secondary polymer chains that arise from the main polymer chain. The branching occurs when the polymer growth shifts from...
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Designed for Molecular Recycling: A Lignin-Derived Semi-aromatic Biobased Polymer
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Lignin-Furanic Rigid Foams: Enhanced Methylene Blue Removal Capacity, Recyclability, and Flame Retardancy.

Hugo Duarte1, João Brás1, El Mokhtar Saoudi Hassani2

  • 1MED-Mediterranean Institute for Agriculture, Environment and Development, CHANGE-Global Change and Sustainability Institute, Faculdade de Ciências e Tecnologia, Universidade do Algarve, Campus de Gambelas, 8005-139 Faro, Portugal.

Polymers
|December 17, 2024
PubMed
Summary

Sustainable tannin-furan foams, utilizing lignin, offer excellent flame retardancy and wastewater treatment capabilities. These eco-friendly materials show high methylene blue adsorption and recyclability, addressing critical environmental challenges.

Keywords:
biobased materialsfoamsligninmethylene bluepolyphenolstanninswater treatment

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Area of Science:

  • Materials Science
  • Environmental Engineering
  • Sustainable Chemistry

Background:

  • Global populations face escalating water scarcity and energy demands, exacerbated by climate change.
  • Wastewater treatment requires advancement to address persistent organic pollutants like dyes and pharmaceuticals.
  • Sustainable materials are crucial for energy savings, particularly in building insulation, due to rising energy prices.

Purpose of the Study:

  • To explore tannin and lignin rigid foams as sustainable materials for both traditional applications and advanced wastewater treatment.
  • To investigate the complete replacement of phenol in tannin-furan foams with lignin sources of varying molecular weights and pH.
  • To assess the impact of lignin properties on foam structure and methylene blue removal efficiency.

Main Methods:

  • Synthesis of tannin-furan foams using lignin as a phenol substitute.
  • Characterization of foam structure and properties.
  • Evaluation of methylene blue (MB) adsorption capacity, kinetics, and equilibrium.
  • Testing of flame retardant properties and recyclability for adsorption-desorption cycles.

Main Results:

  • Alkali-lignin-based foams achieved significant MB adsorption capacity (220 mg g⁻¹), indicating a multilayer adsorption process.
  • The prepared foams demonstrated effective flame retardancy, with no smoke release or ignition upon flame exposure.
  • Foams were successfully recycled for at least five adsorption-desorption cycles, showcasing durability.

Conclusions:

  • Lignin can effectively replace phenol in tannin-furan foams, creating versatile, sustainable materials.
  • These lignin-based foams are promising for efficient wastewater treatment and offer excellent fire safety.
  • The study highlights the potential of bio-based foams in addressing environmental challenges related to water pollution and energy consumption.