Novel Mixed Matrix Membranes Based on Poly(vinylidene fluoride): Development, Characterization, Modeling

Area of Science:

• Materials Science
• Chemical Engineering
• Nanotechnology

Background:

• Membrane technology is crucial for industrial separations.
• High-performance membranes are needed for diverse applications.
• Poly(vinylidene fluoride) (PVDF) is a versatile polymer for membrane fabrication.

Purpose of the Study:

• To develop novel PVDF-based membranes modified with various nanoparticles.
• To optimize nanoparticle content for enhanced membrane performance.
• To evaluate the structural, physicochemical, and transport properties of modified membranes.

Main Methods:

• Modification of PVDF with TiO2, Ag-TiO2, GO-TiO2, and MWCNT/TiO2 nanoparticles.
• Fabrication of dense membranes for pervaporation and porous membranes for ultrafiltration.
• Characterization using FTIR, TGA, SEM, AFM, contact angle measurements, and molecular dynamics simulation.
• Evaluation of transport properties and cleaning ability via ultrafiltration and pervaporation.

Main Results:

• Optimal nanoparticle concentrations determined: 0.5 wt% for dense membranes and 0.3 wt% for porous membranes.
• Dense membranes modified with 0.5 wt% GO-TiO2 exhibited optimal transport properties for water/isopropanol pervaporation.
• Porous membranes modified with 0.3 wt% MWCNT/TiO2 and Ag-TiO2 showed optimal performance in ultrafiltration of bovine serum albumin solution.

Conclusions:

• Nanoparticle modification significantly enhances the performance of PVDF membranes.
• Tailored nanoparticle selection and concentration are key to optimizing membrane function for specific applications.
• Developed membranes show promise for efficient industrial separation processes.