paper16

Desalination 262 (2010) 72

Effect of PEG additive and coagulation bath temperature on the morphology permeability and thermal/chemical stability of asymmetric CA membranes

Ehsan Saljoughi, Mohammad Amirilargani, Toraj Mohammadi

 

a b s t r a c t

In this study, asymmetric cellulose acetate (CA) membranes were prepared from polymeric blend of CA

cast solution than 50 μm) in the membrane sublayer. On the other hand, increasing PEG concentration along with reduction of CBT results in increasing the thermal/chemical stability of the prepared membranes. Presence of low molecular weight PEG additive in the cast solution simultaneously thermal/chemical stability of the prepared membranes. On the other hand, using cold

coagulation bath despite of increasing the thermal/chemical stability of the prepared membranes results in

reduction of membranes porosity/permeability

PEG/1-methyl-2-pyrrolidone (NMP) system via phase inversion induced by immersion precipitation in water coagulation bath. Effects of PEG concentration (0 wt.%, 5 wt.% and 10 wt.%) and coagulation bath temperature (CBT=0 °C and 25 °C) on morphology, pure water permeation flux (PWF) and thermal chemical stability of the prepared membranes were studied and discussed. Rejection of the developed CA membranes was quantified using human serum albumin (HSA) solution. Increasing PEG concentration in thefilm along with higher CBT results in increasing the membrane thickness, pure water flux (PWF) and HSA transmission, also these changes facilitate macrovoids formation (even with the size of morefilm increases porosity/permeability and


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