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Reduction of Biofouling of a Microfiltration Membrane Using Amide Functionalities-Hydrophilization without Changes in
Daniel Breite1, Marco Went1, Andrea Prager1
1Leibniz Institute of Surface Engineering (IOM), Permoserstr. 15, 04318 Leipzig, Germany.
Polymers
|June 25, 2020
Summary
This study enhanced membrane performance by creating an extremely hydrophilic surface using amide functionalities. The modified membranes showed significantly reduced fouling and maintained high permeance during algae filtration.
Area of Science:
- Membrane science and engineering
- Surface chemistry and modification
- Materials science for filtration
Background:
- Membrane performance and fouling are critical challenges in aqueous filtration.
- Increasing surface hydrophilicity is a key strategy to improve performance and reduce fouling.
- Polyethersulfone (PES) membranes are widely used but can suffer from fouling.
Purpose of the Study:
- To hydrophilize a hydrophobic PES microfiltration membrane using a novel amide-based surface coating.
- To investigate the impact of the hydrophilic modification on membrane performance and fouling resistance.
- To assess the stability and characterize the properties of the modified membranes.
Main Methods:
- Surface immobilization of piperazine via electron beam irradiation on PES membranes.
- Amide layer formation through reaction with 1,3,5-benzenetricarbonyl trichloride (TMC).
- Characterization using contact angle measurements, SEM, XPS, and Soxhlet extraction; performance evaluation via dead-end filtration.
Main Results:
- Hydrophobic PES membranes (WCA ~90°) were converted to extremely hydrophilic surfaces (WCA ~30°).
- The modification maintained membrane permeance without pore blocking.
- Modified membranes retained ~60% of initial permeance after three fouling cycles with algae, compared to ~25% for reference membranes.
Conclusions:
- The developed amide-based surface coating effectively enhances membrane hydrophilicity and fouling resistance.
- This method offers a stable and efficient approach to improve microfiltration performance in aqueous applications.
- The technique preserves essential membrane properties like permeance while mitigating fouling issues.
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