Composite membranes

Changes in morphology and transport parameters for a composite lignosulfonate–polyamide/polysulfone membrane associated with temperature effects were studied. Pore size, pore density and porosity dependence with temperature (25 ≤ t (ºC) ≤ 93) was determined analyzing SEM micrographs, while diffusion

The transport properties of hybrid membranes based on polyvinylchloride (PVC) was studied for the separation of Toluene Á n -Heptane mixtures by pervaporation (PV). Aromatic-alkane mixtures are difficult to fractionate by conventional processes and PV has already been shown as a promising technology

In this study, a series of polycarbonate/polyacrylonitrile (PC/PAN) composite membrane has been successfully fabricated by vapor-induced phase separation and in-situ casting process. The effect of the casting solution concentration on the membrane morphology was investigated. The morphology of the P

Surface modification of nanofiltration cellulose acetate (CA) membranes was carried out by alternating layer-bylayer deposition of acidic chitosan (CHI) and sodium alginate (ALG) as the cationic and anionic polyelectrolyte, respectively. The supporting CA membranes were obtained by a phase separatio

Composite cellulose acetate (CA) based membranes having a hydrophobic top layer made of polymethylhydrosiloxane (PMHS) were prepared with the aim of desalination of brackish waters from the Sahel region of Tunisia having a total dissolved salt content (TDS) of about 4100 g.m–3. The porous substructu

The characteristics of the composite membranes of three types in reverse osmosis of the concentrated CaSO4 solutions containing sodium carboxymethyl cellulose, an acidic polyelectrolyte (APE) at different concentrations have been studied. An effect of the concentration of this APE on the characteris

Composite membranes for pervaporation of water/alcohol mixtures were prepared by consecutive alternating adsorption of poly(acrylic acid) (polyanion) and poly(ethylenimine) (polycation) on a polyamide-6 substrate. The influence of preparation conditions on the pervaporation separation properties of

An amphoteric chitosan derivative, containing carboxymethyl (–COOH) groups and amine (–NH2) groups, had been prepared. FT-IR spectra confirmed the presence of γsymCOO (1408 cm–1) and γasCOO (1584 cm–1) on the structural units of the chitosan derivative, and 13C NMR spectra revealed that carboxy meth