Polyvinyl alcohol as the barrier layer in thin film composite nanofiltration membranes: Preparation, characterization, and performance evaluation

High permeate flux of PVA/PSf thin film composite nanofiltration membrane with aluminosilicate single-walled nanotubes

“…The TFN membranes show characteristic peaks of PVA appearing at 2940 cm À1 , 2910 cm À1 , 1430 cm À1 , and 1095 cm À1 , which corresponds to CH 2 asymmetric stretching, CH 2 symmetric stretching, CH 2 in-plane scissoring, and CAO stretching vibrations, respectively [18]. The distinct broad band at 3000-3600 cm À1 is due to the stretching vibration of OH groups in the PVA polymer chain and from pendent aldehyde groups from incomplete cross-linking reactions [13,14]. This band intensified as the concentration of aluminosilicate single-walled nanotubes in the PVA matrix increased due to the OH stretching of the hydroxyl groups present in the imogolite [18].…”

“…PVA, cast to a UF support membrane, serves as a selective layer for rejection of divalent ions with notable resistance to fouling [9]. Several studies about the use of PVA membranes for reverse osmosis [10][11][12] and nanofiltration [13][14][15] have been carried out. Most of these membranes focus on enhancing the permeate flux while maintaining high selectivity by improving surface cross-linking and dip-coating methods.…”

Nanocomposite SPEEK-based membranes for Direct Methanol Fuel Cells at intermediate temperatures

“…An important application for this kind of membranes involves nanofiltration for water purification. Furthermore, salt rejection might be encouraged in our composition by the presence of PVA [59]. It can be then concluded that other salt compositions should be investigated to minimize salt rejection and allow the correct measurement of IEC on this type of membranes.…”

Highly improved reverse osmosis performance of novel PVA/DGEBA cross-linked membranes by incorporation of Pluronic F-127 and MWCNTs for water desalination

“…This is a direct effect of polymer chains crosslinking of PVA with DGEBA. Characteristically, crosslinking of polymer chains generates tighter and denser structures as those polymer chains would interweave and form larger networks [25]. Those more complex structures will impede the free passage of salt molecules across the membrane.…”