β-Cyclodextrin modified PES hollow fiber membrane, a new strategy for bilirubin separation

The aim of this study was to synthesis and evaluates the capability of modified polyethersulfone (PES) hollow fiber membrane for bilirubin separation from patients’ blood. Cyclodextrin (CD) was grafted on the membrane surface via ester bond between hydroxyl groups in CD and sulfonate functional groups on the membrane surface. Surface modification not only improved the membrane hydrophilicity, but also inhibited bovine serum albumin (BSA) and platelets adhesion on the surface. Moreover, the modified membrane could adsorb bilirubin up to 51 mg/g membrane. In conclusion, the proposed system could be a promising candidate to be used instead of resins in hemoperfusion column

Synthesis and characterization of poly(vinylidene fluoride) membrane containing hydrophobic silica nanoparticles for CO2 absorption from CO2/N2 using membrane contactor

The separation of carbon dioxide from CO2/N2 gas mixture using membrane-absorption technology has been investigated. Poly(vinylidene fluoride) (PVDF) membrane was prepared using phase inversion method with N, N-Dimethylacetamide (DMAc) as the solvent and monoethanolamine (20 wt%) was used as the carbon dioxide absorbent. The hydrophobic silica nanoparticles modified with vinyl groups used to raise the hydrophobic character of the prepared polymeric membranes. The chemical structure and hydrophobicity of the silica nanoparticles was studied. The mixed matrix membranes morphology, hydrophobicity, thermal and mechanical properties were investigated. The results showed that the nanoparticles were properly modified with vinyl groups and their contact angles increased from 34 to 131°. Low amount addition of nanoparticles to the polymeric solution caused macrovoid formation, while increasing the nanoparticles loading suppressed macrovoid formation. Carbon dioxide absorption efficiency has been increased by increasing loading of nanoparticles into the membrane because of its smaller pore size and higher hydrophobicity

Preparation of chitosan/cellulose acetate composite nanofiltration membrane for wastewater treatment

Abstract: A chitosan/cellulose acetate (CA) composite membrane is prepared in this study. The effect of varying CA concentration on membrane morphology and performance is studied by using scanning electron microscopy and the composite membrane is characterized by differential scanning calorimetry and thermal gravimetric analysis. Molecular weight cut-off of the composite membrane is found to be 830 Da, which is in the range of nanofiltration. The rejection for copper from a common effluent treatment plant wastewater is observed to be 81.03% at 506.5 kPa applied pressure. The mean pore size is calculated to be 0.78 nm