Title : Synthesis and characterization of modified cellulose acetate ultrafiltration membranes prepared from CA/PVP/Additives/solvent used for water ultrafilteration applications
Abstract:
The main objective of this work is to achieve a high performance membrane with respect to flux and rejection characteristics, with good hydrophilicity and mechanical properties by blending the main polymer cellulose acetate with polymers having desired qualities. The cellulose acetate CA blending with PVP as candidate materials in the presence of ethylene glycol, Acetonitrile, glycerol, poly ethylene glycol, or di ethylene glycol as a pore forming agents (additives), and (Acetone / ethanol) as a solvent. Modified cellulose acetate membranes for ultrafiltration processes prepared by solvent evaporation technique. It was found that using PVP with any of these different additives can increase the membrane porosity, wettability and enhance the permeation flux by changing the membrane morphology. The average permeation flux of MCA was 742 L/D/M2 at TMP 0.3 MPa and ion exchange capacity (IEC) for MCA membrane was 2.7 meq /gm, with water uptake 24 % at 20 °C. The changes in chemical structure for MCA membranes were characterized by FTIR and The membrane structure of CA and MCA including external surface, internal surface and cross section were characterized by scanning electron microscopy (SEM).
