Reversible crosslinking of polybenzimidazole-based organic solvent nanofiltration membranes using difunctional organic acids: Toward sustainable crosslinking approaches

Supramolecular Polymer Networks of Ion-Coordinated Polybenzimidazole with Simultaneously Improved H2 Permeability and H2/CO2 Selectivity

“…However, the covalent cross-linking introduces heterogeneity in the networks and often weakens the mechanical properties . On the other hand, the imidazole rings provide a versatile platform to construct SPNs with improved separation properties and mechanical properties. , For instance, PBI can be doped with polyprotic acids to form the SPNs via H-bonds to increase the size-sieving ability. − However, the H-bonds usually decrease the free volume and thus gas permeability, which is not desirable. To address this, porous SPNs were also synthesized using PBI and organic macrocyclic cavitands (OMCs) with cavity sizes of 3.4–9.6 Å to simultaneously enhance H 2 permeability and H 2 /CO 2 selectivity. , Nevertheless, the dispersion of the OMCs in industrial asymmetric membranes is yet to be demonstrated.…”

Polybenzimidazoles (PBIs) and state-of-the-art PBI hollow fiber membranes for water, organic solvent and gas separations: a review

“…Acid-doped PBI membranes have been extensively studied in the elds of fuel cells, gas separation, pervaporation dehydration of acetic acid and OSN. [17][18][19][20][21][22][23][24][25][26][27][28][40][41][42][43] They possessed excellent properties and allowed operations at high temperatures up to 200 C without dehydration; however, low mechanical properties at high doping levels and acid leaching at extreme temperatures might occur. Chen et al developed a cross-linked PBI membrane with the aid of an aqueous potassium persulphate (K 2 S 2 O 8 ) solution.…”

“…The reversible nature of the PBI-based membranes enabled the successful recovery of the pristine PBI by treatment under mild basic conditions. 43 Farahani and Chung developed a facile crosslinking approach to fabricate high-ux OSN PBI membranes by crosslinking the PBI membrane with trimesoyl chloride (TMC) in 2methyl tetrahydrofuran (2-MeTHF) at room temperature. 57 The resultant PBI membrane had a high pure n-hexane permeance of 80.8 L m À2 h À1 bar À1 and a rejection of 90.4% to tetracycline.…”

“…The reversible nature of the PBI-based membranes enabled the successful recovery of the pristine PBI by treatment under mild basic conditions. 43…”

Hollow Fiber Membrane for Organic Solvent Nanofiltration: A Mini Review

“…From a sustainable and green point of view, the major membrane manufacturing processes are environmentally unfriendly [ 130 ]. In recent years, many published papers have reported on sustainable, environmentally friendly membrane materials and membrane preparation processes [ 52 , 61 , 131 , 132 , 133 , 134 , 135 , 136 , 137 , 138 , 139 , 140 , 141 , 142 ]. It is foreseeable that one of the common areas for future HF OSN membrane R&D should be the green and sustainable preparation of HF OSN membranes.…”