Facile Fabrication of Superwetting PVDF Membrane for Highly Efficient Oil/Water Separation

Abstract

A novel superhydrophilic and underwater superoleophobic modified PVDF membrane for oil/water separation was fabricated through a modified blending approach. Pluronic F127 and amphiphilic copolymer P (MMA-AA) were directly blended with PVDF as a hydrophilic polymeric additive to prepare membranes via phase inversion induced by immersion precipitation. Then, the as-prepared microfiltration membranes were annealed at 160 °C for a short time and quenched to room temperature. The resultant membranes exhibited contact angles of hexane larger than 150° no matter whether in an acidic or basic environment. For 1, 2-dichloroethane droplets, the membrane surface showed a change from superoleophilic to superoleophobic under water with aqueous solutions with pH values from 2 to 13. This as-prepared membrane has good mechanical strength and can then be applied for oil and water mixture separation.

Surface functionalization of cellulose derived from hemp by tetraethyl orthosilicate (TEOS) and poly vinylidene fluoride-based composite separator membrane for lithium-ion batteries (LIBs)

“…Considerably the pristine PVDF membrane (Fig. 3a), the peak of C 1s could be curve-fitted with four Gaussian peaks centered four peak components, with binding energies (BEs) at 290.4 eV for the CF 2 species and 295.9 eV for the CH 2 species are clearly obtained within all samples [29]. Moreover, in the spectrum of pristine PVDF membrane, the two more peaks centered at 284.6 and 285.8 eV are corresponded to C-H and C-atom in strong electron withdrawing environment (e.g., ester group, amide group or bonded with electron withdrawing atoms such as N or O, signed with COO), respectively [30].…”

Surface functionalization of cellulose derived from hemp by tetraethyl orthosilicate (TEOS) and poly vinylidene fluoride-based composite separator membrane for of lithium-ion batteries (LIBs)

“…Considerably the pristine PVDF membrane (Fig. 3a), the peak of C 1s could be curve-tted with four Gaussian peaks centered four peak components, with binding energies (BEs) at 290.4 eV for the CF 2 species and 295.9 eV for the CH 2 species are clearly obtained within all samples [29]. Moreover, in the spectrum of pristine PVDF membrane, the two more peaks centered at 284.6 and 285.8 eV are corresponded to C-H and C-atom in strong electron withdrawing environment (e.g., ester group, amide group or bonded with electron withdrawing atoms such as N or O, signed with COO), respectively [30].…”

Preparation of PAN@PU coaxial electrostatic spun nanofibers for oil/water separation

“…Nanofiber membranes prepared by electrostatic spinning technology are widely used in the treatment of oily wastewater due to their large specific surface area, high porosity and high separation efficiency. [9][10][11] The commonly used membrane raw materials for nanofiber separation membranes are natural polymers such as cellulose, 12,13 lignin 14 and synthetic polymers such as polyacrylonitrile (PAN), [15][16][17] polyvinylidene fluoride (PVDF), 18 polyurethane (PU), 19 polyamide (PA), 20 and polyethersulfone (PES). 21 However, nanofibrous membranes prepared from these polymers suffer from poor mechanical properties, which seriously hampers their practical application space.…”