In dead-end membrane filtration of heavy metals, if the membrane is adsorptive for metal ions, what will happen to the related counter ion?
For example if the heavy metal solution is prepared from MgCl2 salt and the membrane has binding with Mg, what will happen to Cl ions in the solution? Do they were adsorbed and stayed in membrane phase, because of electroneutrality? or they can pass through the membrane and then the permeate water has negative charge!?
#membrane #electronutrality #heavymetals #adsorption
Dear Muhammad,
To my understanding, if your membrane is some particular ion selective, then it's function will highly dependable on the source input (feed).
The other way round is, just to get an idea of your membrane affinity for a selective ion; monitor the pH of your permeate at constant intervals. You will get a clear idea about the membrane selectivity. If the permeate pH is increasing with time, it is an indication that your membrane is letting -ve charged ions go through and vise versa.
Hope ot helps.
Best,
S.S.A. Shah
Dear Salman
Thank you very much for your reply. You are right.
Indeed in this case the permeate contains more protons (H+) to balance the charge, so there will be a lower pH in the permeate.
Best
Mohammad
Dear
if membrane is adsorptive to metal ion, then membrane charge density will change according to metal ion concentration. and consequently, the mass transport of respective ion will also change.
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