Influence of the properties of layer-by-layer active layers on forward osmosis performance

Layer-by-Layer Assembly of Aquaporin Z-Incorporated Biomimetic Membranes for Water Purification

“…In comparison to the LbL1.0 membrane, the slight decline in the flux and increase in the rejection may be caused by the increase in membrane thickness as the number of polyelectrolyte bilayers increased. 24 A higher polyelectrolyte deposition favors better pore sealing and a size exclusion effect. These two effects contribute to a lower permeability to water and higher rejection toward the solutes.…”

Highly crosslinked layer-by-layer polyelectrolyte FO membranes: Understanding effects of salt concentration and deposition time on FO performance

“…Various methods have been applied to design FO membranes such as traditional cellulosic membranes [4], thin film composite (TFC) membranes [5][6][7], and recently technology called layer-by-layer (LbL) membranes [8][9][10][11][12]. LbL is a flexible process that offers a variety of functionalized materials for a range of applications such as biosensors [13], drug delivery [14], membrane separations (e.g.…”

“…LbL is a flexible process that offers a variety of functionalized materials for a range of applications such as biosensors [13], drug delivery [14], membrane separations (e.g. pervaporation [15][16][17][18], fuel cells [19], microfiltration [20], nanofiltration [21,22], reverse osmosis [23] and forward osmosis [8][9][10][11][12]), biomedical devices [24], food packaging [25] and others [26]. In LbL polyelectrolyte fabrication process, polyelectrolyte multilayers are normally assembled by the sequential adsorption of polyanions and polycations manually or automatically via dip-coating [21,27,28], spraying [29,30] or spin-coating [31] methods through electrostatic interaction.…”

“…A weak polyelectrolyte poly(allylamine hydrochloride) (PAH, þ) and a strong polyelectrolyte poly(sodium 4-styrenesulfonate) (PSS, À ) as shown in Fig. 1 were deposited onto a negatively charged porous support (hydrolyzed PAN, H-PAN) at a zeta potential of À 30 mV under 10 mM NaCl environments [9,12]. First, the influence of salt concentration and deposition time on the FO performance of the membranes was evaluated to obtain the optimal conditions for consequent studies.…”

Metal–organic framework-based porous matrix membranes for improving mass transfer in forward osmosis membranes

“…The procedures for the fabrication of LbL rejection layer can be found in details elsewhere [13,[17][18][19]. In brief, one side of the MOF-based porous matrix FO membrane substrates were alternatively immersed into the PAH and PSS solutions for 15 min followed by soaking the substrate into the DI water after each polyelectrolyte soaking step to remove the excess charged polyelectrolyte.…”