Formation and characterization of asymmetric nanofiltration membrane: Effect of shear rate and polymer concentration

Performance of PEI/BMI semi-IPN membranes for separations of various binary gaseous mixtures☆

“…gap of 250 m), the thickness of membrane cast with solution (b) has to be 262 m in order to produce 16 cm 2 dried membrane that weighs 0.1227 g. This means that a slight swelling of the more viscous solution (b) took place during casting process that was similar to die swelling as illustrated elsewhere [15]. According to Ismail and Hassan [16] shear rate is a function of the velocity of casting knife and membrane thickness. Therefore, the shear rate that influences membrane morphology and performance as discussed elsewhere [15,17] was not the same for the two membranes when the same speed of casting knife is used.…”

“…Recently, Ismail and Hassan [16] reported the preparation of asymmetric polysulfone nanofiltration flat membranes, and showed that decreasing the polymer concentration or increasing the shear rate (up to a critical shear rate) led to an increase in the pure water permeation but a decrease in the percentage of salt rejection. A similar observation on the influence of shear rate in membrane preparation on the membrane performance for CO 2 /CH 4 separation was reported elsewhere [17].…”

Enhanced Separation Performance of Cellulose Acetate Membrane For Brackish Water Separation Using Modification of Additives and Thermal Annealing

“…For certain purposes, additives are often added to the dope solution. Kind of additive that is often used is polyethylene glycol (PEG).The manufacture of membranes with addition of PEG additive has the effect of increasing rate membrane permeation because PEG is known as a pore-forming organic material on the membrane [5][6][7]. Increasing amout of PEG can increase the porosity of the chitosan-cellulose composite membrane, which is shown through an increase in flux of the membrane [6][7][8].…”

“…But, in fact, on the membrane separation process will be found a common phenomenon that when the permeability of the membrane is high then selectivity will be low. Ismail et al [5,8] stated that many factor affected the membrane performance such as: the type and concentration of polymer, solvent type, solvent evaporation time, additive concentration and shear rate. The membranes production with addition of PEG additive has the effect of increasing rate membrane permeation because PEG is known as a pore-forming organic material on the membrane [9].…”

Studies of thermal annealing and dope composition on the enhancement of separation performance cellulose acetate membrane for brackish water treatment from Jepara

“…In the study of making asymmetric membranes, aceton solution is commonly used as a solvent with a cellulose acetate as a polymer [5,6]. Cellulose acetate was chosen as the polymer component due to the cellulose acetate can form an asymmetric structure with a very thin active layer and the dissolved material can withstand the rough on the support layer, as well as chlorine tolerant and resistant to the occurrence of precipitation [7][8].…”