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Graphene-Coated PVDF Membranes: Effects of Multi-Scale Rough Structure on Membrane Distillation Performance
Emilia Gontarek-Castro1, Giuseppe Di Luca2, Marek Lieder1
1Department of Process Engineering and Chemical Technology, Faculty of Chemistry, Gdansk University of Technology, 11/12 G. Narutowicza St., 80-233 Gdansk, Poland.
Membranes
|May 28, 2022
Summary
Graphene-coated membranes show enhanced water desalination performance. These novel membranes offer improved flux and complete salt rejection, making them promising for future water purification technologies.
Area of Science:
- Materials Science
- Chemical Engineering
- Environmental Science
Background:
- Membrane distillation (MD) is a promising technology for water desalination.
- Improving membrane performance, particularly flux and fouling resistance, is crucial for efficient desalination.
- Graphene nanoplatelets offer unique properties for surface modification.
Purpose of the Study:
- To fabricate and characterize graphene-coated polyvinylidene fluoride (PVDF) membranes for membrane distillation.
- To evaluate the impact of graphene coating on membrane surface topography and performance in water desalination.
- To assess the wetting and fouling resistance of the modified membranes.
Main Methods:
- Fabrication of graphene-coated PVDF membranes using a wet-filtration approach.
- Deposition of graphene nanoplatelets onto PVDF membrane surfaces.
- Characterization of membrane morphology and physicochemical properties.
- Performance testing in membrane distillation (MD) using sodium chloride and humic acid mixtures.
Main Results:
- Graphene coating created a multi-scale rough surface structure on PVDF membranes.
- Graphene-coated membranes exhibited enhanced wetting and fouling resistance.
- A significant increase in flux (77%) and total salt rejection were achieved compared to pristine PVDF.
- Optimized graphene content led to superior performance in desalination tests.
Conclusions:
- Graphene-coated PVDF membranes demonstrate significant potential for high-performing water desalination.
- The enhanced surface properties contribute to improved flux and salt rejection.
- These novel membranes are promising for developing advanced functional membranes for water purification.
