PDMS/PVDF hybrid electrospun membrane with superhydrophobic property and drop impact dynamics for dyeing wastewater treatment using membrane distillation

Fouling in Membrane Distillation, Osmotic Distillation and Osmotic Membrane Distillation

“…It was found that the negatively charged nanofibrous membrane fabricated by a blend of poly(vinylidene fluoride-co-hexafluoropropylene), PVDF-HFP, and the cationic surfactant benzyltriethylammonium, and then grafted by a negatively charged silica nanoparticles, exhibited excellent wetting resistance against low surface tension aqueous solutions and organic solvents (i.e., mineral oil, decane and ethanol). An et al [29,30] demonstrated that the MD membranes having negative charge such as PTFE at pH values in the range 5.2-9.1 were resistant to dye adsorption. The strong negative charge and chemical structure of the membrane resulted in a low adsorption affinity to negatively charged dyes causing a flake-like (loose) dye-dye structure to form on the membrane surface rather than in the membrane pores or even repulsed from the membrane forming aggregates away from the membrane interface.…”

“…However, for the PP after adsorptive fouling with model manure solution the zeta potential was above −15 mV (at pH ≈ 9) (see Figure 7) suggesting an increased fouling potential due to decreased electrostatic repulsion between the membrane surface and the model manure solution. An et al [29,30] characterized both commercial and prepared MD membranes by means of zeta potential at different pH values and claimed that the negatively charged MD membranes were resistant to dye adsorption and subsequent fouling. An et al [29,30] characterized both commercial and prepared MD membranes by means of zeta potential at different pH values and claimed that the negatively charged MD membranes were resistant to dye adsorption and subsequent fouling.…”

“…In addition, the SEM image indicated good fouling resistance of the modified membrane. Comparatively, An, et al [30] showed that the hydrophobic PDMS microspheres coated on an electrospun PVDF-HFP membrane improved anti-wetting (i.e., a significant increase of the water contact angle 155.4 • ) and antifouling properties of the membrane when treating dyes aqueous solutions. This membrane exhibited a more negative charge than that of a commercial PVDF and therefore less fouling to differently-charged dyes.…”

Electrospun Antimicrobial PVDF‐DTAB Nanofibrous Membrane for Air Filtration: Effect of DTAB on Structure, Morphology, Adhesion, and Antibacterial Properties

“…Crystal structure of PVDF has been solved and refined by several authors; the overview of PVDF crystal phases and their formation under different conditions is summarized by Martins et al . The crystal phases reported in connection with electrospinning technology are α and β. PVDF powder used as the input material for spinning solution is usually in α form, while the electrospun membranes are usually a mixture of α and β phase, where the proportion of both phases depends on spinning conditions and additives in spinning solution .…”

Designing electrospun nanocomposite poly(vinylidene fluoride) mats with tunable wettability

“…This means that the dominant crystal phase in the pristine PVDF used in this research is α-phase, while β and γ are absent or below detectable limits. The spectrum of pristine PVDF also exhibits a peak at 871 cm −1 which corresponds to skeletal vibrations of CeC, a peak at 1069 cm −1 which signifies symmetrical stretching of CF 2 , at 1180 cm −1 due to CF 2 stretching vibration and a peak at 1400 cm −1 corresponding to stretching vibration of CeH bonds [22,57].…”