Hi everyone
can anyone tell me why using RO/NF is very good in removing NSAIDs from water but in case of diclofenac it is not very efficient?
Why do you say so?
Diclofenac is a NSAID! So, if RO/NF membrane separation process is efficient for NSAIDs, it should be efficient for diclofenac as well!
Attention should be paid to the material of the RO membrane used. Specifically, the pH value. I think the activity of this organic acid might matters.
I mean, different materials of a membrane have different operation ranges of pH values for the material to be separated. If diclofenac is a strong acid, then it might damage the structure of the membrane. Same principle applies to detergents too.
Ali Nematollahzadeh That's what I thought too, but I read in a report that diclofenac was not efficiently removed by the RO/NF like other NSAIDs.
Okay. Think about the case when acidity is too strong and the membrane has -OH base, then the membrane maybe compromised and the size of the average holes on the membrane will increase. In this case, the separation efficiency will be decreased if the previously selected molecular size is adequate.
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