Influence of polyanion type and cationic counter ion on the SRNF performance of polyelectrolyte membranes

Sacrificial polyelectrolyte multilayer coatings as an approach to membrane fouling control: Disassembly and regeneration mechanisms

“…LbL assembly of PEMs is attractive for coating membranes due to its conceptual simplicity and control over film thickness, composition and surface charge [13,14]. Thus, a number of studies investigated PEMs as membrane skins for nanofiltration [15][16][17][18][19][20][21], reverse osmosis [22,23], forward osmosis [24] and pervaporation [25]. As with other specially designed antifouling surfaces, however, PEMs may temporarily resist adhesion of feed components, but eventually a fouling layer will coat the surface and negate antifouling properties.…”

‘Up-scaling’ potential for polyelectrolyte multilayer membranes

“…H-PAN support was prepared following the procedure reported earlier [26]. Briefly, a 15 wt % solution of PAN in DMSO was cast on a nonwoven PE/PP support via the phase inversion method, followed by a hydrolysis procedure in-order to convert PAN to H-PAN.…”

“…SRNF membranes should preserve their separation properties in aprotic or strongly swelling solvents, extreme temperatures and other aggressive conditions [23,24]. To date, SRNF membranes based on PEMs have been prepared successfully from PE pairs, such as sulfonated poly(etheretherketone) (SPEEK) /poly(diallyldimethylammonium chloride)(PDDA) [21], (PDDA/Polyacrylicacid) (PAA) [25], (PDDA/Polyvinyl sulfonic acid) (PVS) [26], (PDDA/Polystyrene sulfonate) (PSS) [26], on hydrolyzed polyacrylonitrile supports (H-PAN) and PDDA/SPEEK on charged silicon composite/H-PAN supports [27]. These membranes are generally utilized for the separation of organic dyes from solvent.…”

Recent Advances in Polymeric Solvent‐Resistant Nanofiltration Membranes

“…34,[82][83][84][85][86][87][88][89][90][91] Li and co-workers 33-37 studied a series of SRNF membranes fabricated by the self-assembly LBL method. They fabricated PEs composite SRNF membranes by combining polydiallyldimethylammonium chloride polycations with various polyanions, including polyacrylic acid (PAA) 33 , sulfonated poly(ether ether ketone) [34][35][36] , poly(sodium styrene sulfonate), and poly(vinyl sulfate). 37 Their results illustrated that the thickness of PEs composite SRNF membranes affect the permeability of solvents [33][34][35][36][37] and can be adjusted by the number of deposited layers as well as the conformation of the PEs chains.…”

“…PEs chains with a higher density of electrostatic charges tend to better match the distances between charged groups in the polycation and the polyanion, leading to a flatter deposition with less loops, which accounts for higher retentions and higher permeability of membranes with a higher density of electrostatic charges. 35,92 The effects of pH and ionic strength on the thickness and permeability of the membranes is a function of the type of polyion used. The thickness of membranes fabricated with the LBL technique using polydiallyldimethylammonium chloride and PAA decreases as the pH value of the deposition solution increases from 2 to 4.…”