Fabrication of antifouling membranes by blending poly(vinylidene fluoride) with cationic polyionic liquid

Abstract

Membrane fouling problem is now limiting the rapid development of membrane technology. A newly synthesized cationic polyionic liquid (PIL) [P(PEGMA-co-BVIm-Br)] was blended with poly(vinylidene fluoride) (PVDF) to prepare antifouling PVDF membranes. The PVDF/P(PEGMA-co-BVIm-Br) exhibited an increased surface hydrophilicity, the water contact angle was reduced from 77.8 (pristine PVDF) to 57.9 . More porous membrane structure was obtained by adding PIL into the blending polymers, as high as 478.0 L/m 2 Áh of pure water flux was detected for the blend PVDF membrane in comparison with pristine PVDF (17.2 L/m 2 Áh). Blending of the cationic PIL with PVDF gave a more positive surface charge than pristine PVDF membrane. Blend membranes showed very high rejection rate (99.1%) and flux recovery rate (FRR, 83.0%) to the positive bovine serum albumin (BSA), due to the electrostatic repulsion between the membrane surface and proteins. After three repeated filtration cycles of positive BSA, the blend PVDF membranes demonstrated excellent antifouling performance, the permeation flux of the membranes was recovered very well after a simple deionized water washing, and as high as 70% of FRR was obtained, the water flux was maintained at above 350 L/m 2 Áh.

Hydrophilic and Positively Charged Polyvinylidene Fluoride Membranes for Water Treatment with Excellent Anti-Oil and Anti-Biocontamination Properties

“…The utilized polycationic liquid, or so-called cationic polyionic liquid, (P(BVImBr 1 -co-PEGMA 1 )) was synthesized by following the similar protocol in our previous research [27], but in a different monomer ratio (1/1). The product is denoted as P11 in later description.…”

“…In our previous report [27], a polycationic liquid P(BVImBr 1 -co-PEGMA 2 ), was blended with PVDF. The prepared membranes showed good repellence (up to 99%) against positively charged BSA, and the flux recovery rate was improved to 76%.…”

A Three-Dimensional Electrospun Li6.4La3Zr1.4Ta0.6O12–Poly (Vinylidene Fluoride-Hexafluoropropylene) Gel Polymer Electrolyte for Rechargeable Solid-State Lithium Ion Batteries

“…Another way is to prepare porous GPE membranes to improve the absorbing ability of liquid electrolyte ( Wang et al, 2017 ; Zhang D. et al, 2017 ). However, the GPE membranes only own few holes synthesized by the traditional blade casting method, which leads to a bottleneck in forming fast ion channels ( Farooqui et al, 2017 ; Shen et al, 2019 ). By contrast, electrospinning is a facile and effective method to prepare a porous nanofiber membrane, which constructs a three-dimensional (3D) network to uptake liquid electrolyte ( Prasanth et al, 2014 ; Huang et al, 2015 ; Zhou et al, 2017 ).…”

High‐flux PVDF/PVP nanocomposite ultrafiltration membrane incorporated with graphene oxide nanoribbones with improved antifouling properties

“…[13][14][15] In recent years, to improve the polymeric membrane performance and fouling resistance, researchers have investigated the nanocomopsite membrane which is a heterogeneous combination of inorganic nanomaterials as nanofillers and polymer matrix. [16][17][18][19][20][21] It is expected that this combination produces membranes with better strength and enhanced hydrophilicity. It also leads to improved performance of the membrane (more removal efficiency and water flux), membrane shelf life and fouling resistance.…”

“…The trade‐off relationship between selectivity and permeability as well as membrane fouling is critical issues in the application of polymeric membranes in water and wastewater treatment 13–15 . In recent years, to improve the polymeric membrane performance and fouling resistance, researchers have investigated the nanocomopsite membrane which is a heterogeneous combination of inorganic nanomaterials as nanofillers and polymer matrix 16–21 . It is expected that this combination produces membranes with better strength and enhanced hydrophilicity.…”