Preparation and characterization of nanocomposite PVDF ultrafiltration membrane embedded with nanoporous SAPO-34 to improve permeability and antifouling performance

• PVDF ultrafiltration membrane blended with SAPO-34 zeolite was prepared.
• The membranes were prepared by the non-solvent induced phase inversion method.
• The SAPO-34 filled PVDF membranes show higher hydrophilicity and water flux.
• SAPO-34 has no obvious influence on the membrane cross-sectional structure.
• Membrane with 0.5 wt% SAPO-34 show the best antifouling performance (FRR = 89.4%).

A novel polyvinylidene fluoride (PVDF) ultrafiltration membrane blended with different concentrations of SAPO-34 nanoporous zeolite was fabricated by the non-solvent induced phase inversion method. The prepared blended membranes were characterized by scanning electron microscopy (SEM), water contact angle, porosity, energy dispersive X-ray (EDX), and permeation analyses as well as fouling and rejection tests. The SEM images of the membranes showed an asymmetric structure possessing a dense top-layer and a combination of spongy and finger-like porous sub-layer. The modified PVDF membranes had lower water contact angle, higher hydrophilicity and water flux due to the presence of hydrophilic SAPO-34 zeolite in the polymer medium. All of the nanocomposite membranes showed higher flux recovery ratio (FRR (%)) compared to the unfilled PVDF membrane. The membrane containing 0.5 wt% SAPO-34 had the best antifouling performance (FRR = 89.4%) with a bovine serum albumin (BSA) rejection value more than 99%.

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