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Filtration00:53

Filtration

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Filtration is a physical separation process that involves passing a suspension through a porous medium to separate solids from fluids. During filtration, solids collect on the porous medium while liquids, also collectively known as the filtrate, pass through. The filtration medium is selected based on the filtration purpose, quantity, and nature of the precipitate. The general criteria for a suitable filtering medium are that it is inert, mechanically strong, nonabsorbent toward dissolved...
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  11. Alginate/gelatin Blend Fibers For Functional High-performance Air Filtration Applications

Alginate/gelatin blend fibers for functional high-performance air filtration applications

Ubey Ahmetoglu1, Melike Gungor2, Ali Kilic2

  • 1Department of Nanoscience and Nanoengineering, Istanbul Technical University, Istanbul, Turkey.

International Journal of Biological Macromolecules
|January 2, 2025

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View abstract on PubMed

Summary
This summary is machine-generated.

Biodegradable air filters made from gelatin and sodium alginate offer excellent PM0.3 particle capture (94.2%) and V0 flame retardancy. These eco-friendly filters fully degrade in soil within 7 days, providing a sustainable solution.

Area of Science:

  • Materials Science
  • Environmental Science
  • Filtration Technology

Background:

  • Conventional air filters rely on petroleum-based synthetic polymers, posing environmental concerns.
  • Growing demand for air filters with high particle/odor capture, energy efficiency, and flame retardancy in automotive and HVAC applications.
  • Need for sustainable and biodegradable alternatives to synthetic filter media.

Purpose of the Study:

  • To develop biodegradable and flame-retardant air filters with a high quality factor using natural fibers.
  • To investigate the filtration performance, flame retardancy, and biodegradability of gelatin/sodium alginate blend fibers.
  • To explore eco-friendly materials for advanced air filtration.

Main Methods:

  • Production of free-standing gelatin/sodium alginate blend fibers using centrifugal spinning.
Keywords:
Air filterBiopolymersCentrifugal spinningFlame retardant

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  • Stabilization of water-soluble mats via thermal and ionic crosslinking (specifically, using calcium alginate).
  • Evaluation of filtration efficiency for PM0.3 particles, pressure drop, flame retardancy (UL94 standard), and biodegradation in soil.

    • Main Results:

    • The Crosslinked-Gelatin/Calcium Alginate (CGCA) mat achieved 94.2% efficiency for PM0.3 particles at a low pressure drop of 135 Pa.
    • The blended biopolymer fibers exhibited V0 level flame retardancy according to the UL94 standard after calcination.
    • Preliminary studies demonstrated complete biodegradation of the nanofibrous filters in soil within 7 days.

    Conclusions:

    • Centrifugal spinning of gelatin/sodium alginate blends is a viable method for producing high-performance, biodegradable air filters.
    • The developed CGCA filters meet critical performance criteria including high filtration efficiency, flame retardancy, and rapid biodegradability.
    • This research presents a promising sustainable alternative to conventional synthetic air filter materials.
    Gelatin
    Sodium alginate