Pervaporation dehydration of ethanol by using polyelectrolyte complex membranes based on poly (N-ethyl-4-vinylpyridinium bromide) and sodium carboxymethyl cellulose

Sodium alginate–gelatin polyelectrolyte complex membranes with both high water vapor permeance and high permselectivity

“…In terms of this viewpoint, polymers with large quantities of hydrophilic groups should be promising alternatives, especially for those derived from natural hydrophilic polymers, which usually possess excellent water solubility, good membrane forming property, abundant availability and non-toxicity. As a matter of fact, some of them, such as chitosan, alginate, sodium carboxymethyl cellulose, and hyaluronic acid, have been successfully applied to the fabrication of pervaporation (PV) membranes for solvent dehydration [14][15][16]. Meanwhile, sulfonated poly(ether ether ketone), sulfonated polyethersulfone, Pebax ® 1074 membrane materials have been successfully utilized for gas dehydration [3] owing to the moderate swelling resistance of the membranes.…”

“…Several types of PECs have been developed for the dehydration of alcohols with high PV performance especially for rapid water permeation, and their physical structures, in addition to water sorption and diffusion characteristics, can be easily tuned by changing the blend ratio of the concerned two polyelectrolytes [16][17][18][19]. Based on the identical solution-diffusion mechanism behind the two membrane processes, pervaporation and gas separation, it can be deduced that PEC membranes composed of natural hydrophilic polymers should have great potentials for gas dehydration.…”

Photocatalytic Performance of Carbon Monolith/TiO2Composite

“…However, in the presence of sample CM/TiO 2 /Bc 0.25 equilibrium was reached after 45 minutes and concentration of MB was decreased for approximately 31%. Since sodium carboxymethyl cellulose can act as an ionexchanger [31], decrease in the MB concentration may be the consequence of two simultaneous processes occurring on the CM/TiO 2 /Bc 0.25 surface: adsorption onto CM surface and ion exchange reaction between MB and sodium carboxymethyl cellulose. Taking into account the decrease of the MB concentration induced by adsorption onto CM surface (up to 10%), relatively high concentration decrease and slower equilibrium reach in the case of sample CM/TiO 2 /Bc 0.25 primarily originate from ion exchange reaction between sodium carboxymethyl cellulose and MB.…”

Ultrathin free-standing membranes from metal hydroxide nanostrands

“…Due to their intrinsically high permeability to gases, P4VP membranes have been used for gas separation and pervaporation [152,153]. The quaternization of the pyridine groups, however, produces a polymer which is very soft in water and therefore these gel membranes generally require reinforcement by the addition of stiffer components [154].…”