Cellulose and Chitosan Composite Membranes for Protein and Salt Filtration
AbstractCellulose membrane (SE) was prepared by culturingÂ Acetobacter xylinumÂ in a media with sucrose as a carbon source and was used as a supporting membrane in this study. Pore size of the supporting membrane was studied by means of molecular weight cut off (MWCO) and SEM micrographs. For making cellulose/chitosan composite membrane SE/CH, chitosan solution was used as a coating polymer and applied by a casting method.This resulted in a smaller hydraulic permeability coefficient (Lp) from 6.7 Ã— 10â€“11Â m3Â Nâ€“1Â sâ€“1Â in membrane SE to 1.94 Ã— 10â€“12Â m3Â Nâ€“1Â sâ€“1Â in the composite membrane SE/CH. Using PEG of several molecular weights as feed solution, the MWCO of the SE membrane was 200 kDa while that of the SE/CH membrane was 6 kDa. The former rejected 1 g Lâ€“1Â BSA by 80%. With pH between 3 and 8, the composite membrane SE/CH rejected NaCl and NaHCO3Â by 50%, independent of the pH level. However, when using a divalent salt solution of MgSO4Â the rejection was increased up to 85%, with an optimum at pH 6â€“7 and a permeate flux of 5.0 L mâ€“2hâ€“1Â at pressures of 0.5 MPa.
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