I have a question and would appreciate it very much if you could guide me.
I have started preliminary work on fabrication of nanofiltration using polysulfone as the support and the polyamide as the top layer. The polyamide layer is made by interfacial polymerization of piperazine and TMC. The SEM micrographs of the membranes clearly show the formation of the polyamide layer. However, the membrane does not show any rejections of MgSO4. I have tested different operation conditions (pressure, flow rate) and have also modified the fabrication by heat treatment and longer dipping time. However, no rejection is observed. I cannot understand what the problem is. Thank you very much.
dear colleague :
you made an error in the quantity(amaount) only between the support and the polyamine ???? check the 2 procedures and make a comparison: 1- support larger than polyamide 2- support smaller than polyamine this is where you can understand your error.
best regards
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