I have tried to fabricate NF membrane using PES and NMP. but, when I prepare a solution, for example (18 %wt), and cast it into several sheets, then test their water flux, I get quite different flux among these membranes and even within the same membrane ( differences are sometimes double, 3 folds and more)....many thanks.
Yes you can get different results,many paprmaters than can affect on the final result as the speed of casting , time until put in water bath, also the temperature of the lab. make sure that factors under control. i suggestion to you to check by previous studies main influenced factors on membrane fabrication
Dear,
yes that's right, but my problem is: I get different fluxes at different places in the same sheet where all parameters are same ( thickness, speed, evaporation etc.)
Now I get the same problem. I used the same membrane and same pressure. but the flux varies significantly. I think the problem might be caused by the membrane structure, especially for charged membranes. According to what I know, there are many functional groups at the surface of the membrane. and they can influence the permeate flux. But I dont know the exact reasons. Hope this could be helpful to you. If you get any new information on this issue, please share it with me. Thank you in advance.
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