A novel approach to fabricate macrovoid‐free and highly permeable PVDF hollow fiber membranes for membrane distillation

The effect of incorporating ionic liquid into polyethersulfone-SAPO34 based mixed matrix membrane on CO2 gas separation performance

“…Membrane with dense structure is always preferable for gas and water separation functions since the presence of macrovoids in the membrane structure is undesirable because the macrovoids might have adverse influence on long-term membrane stability [49][50][51][52]. From these dense images also, we can see that good adhesion exists between the polymer matrix and SAPO-34 interface.…”

Advances in Membrane Distillation for Water Desalination and Purification Applications

“…In addition, the total active surface area of membrane available is higher in the case of hollow fiber membranes due to both the higher packing density and the individual membrane surface area. Furthermore, as explained by Bonyadi et al [49,50] and Wang et al [269] in their respective papers, the size, shape and connectivity of the macro-voids highly affects water vapor permeation across the membrane. By engineering larger macro-voids connecting the lumen to the membrane wall, Wang et al [269] managed to increase the water vapor permeability up to 98 kg m , making these membranes potential competitors with the commercial best performing FS membranes.…”

“…The low flux is related to its poor flow dynamics and the resultant high degree of temperature polarization. However, high-flux hollow fiber membranes with different features suitable for membrane distillation have been developed recently, such as dual-layer hydrophilic-hydrophobic fibers with a very thin effective hydrophobic PVDF layer (50 µm), and hollow fiber membranes with a sponge-like structure and thin walls [45,47,50,51], which have flux of about 50-70 kg m [6] at inlet temperatures of hot 60 °C and cold 20 °C. In general, the polymeric membrane shown in Figure 3b is composed of a thin active layer and a porous support layer.…”

Engineering flat sheet microporous PVDF films for membrane distillation

“…Polyvinylidene fluoride (PVDF) has been extensively studied as a material for MD membranes because of its hydrophobic nature, excellent chemical compatibility, and physical robustness [17][18][19][20][21]. Non-solvent induced phase separation (NIPS) is the most common method for fabricating PVDF membranes with desired porosity and pore structure [22].…”