Performance characterization of cellulose acetate and poly(vinylpyrrolidone) blend membranes

Abstract

Hydrophilic ultrafiltration membranes have been prepared by blending cellulose acetate (CA) as a matrix polymer with increasing concentrations of poly(vinylpyrrolidone) (PVP) using N,N 0 -dimethylformamide as the solvent. It is observed that the presence of PVP beyond 50 wt % in the casting solution did not form membranes. Prepared membranes have been subjected to ultrafiltration characterizations such as compaction, pure water flux, water content, and membrane hydraulic resistance. The results indicate significant changes in the characteristics upon the addition of PVP, which may lead to improved performance. The porosity, pore size, and molecular weight cut-off of the membranes also increase as the concentration of PVP increases. It is estimated that the pore radius of the CA/PVP membranes increases from 30 to 63 Å , when the concentration of PVP increased from 0 to 50 wt %. This is in agreement with the results obtained from scanning electron microscopic studies.

Effective removal of humic acid using xanthan gum incorporated polyethersulfone membranes

“…Porosity of membranes are calculated by the formula(Raguime et al, 2007) given below and depicted inTable 2.…”

Green Approaches for Sustainable Development of Liquid Separation Membrane

“…Particularly, methyl lactate is only used in the fabrication of CA UF membrane [ 24 ]. The molecular weight cut off (MWCO) of the membrane prepared using methyl lactate is around 10−500 kDa, which represents a typical UF membrane, while the percentage of solutes rejection is similar to the membranes fabricated with NMP as solvent [ 82 , 83 ].…”

Preparation and characteristics of polysulfone dialysis composite membranes modified with nanocrystalline cellulose

“…The dialysis membranes were broken in liquid nitrogen, then cross-sectioned. The bottom surfaces and the cross-section of the membrane, sprayed with gold, were observed with a scanning electron microscope (SEM, S-3000n, Hitachi, Japan) (Raguime et al 2007;Qiu et al 2009).…”