I'm doing a dialysis to remove ions from my graphene oxide solution. I'm using ultrapure milliQ water (1.8MOhm/cm) as a counter solution and changing the water three times a day for now two weeks. But every morning my dialysate conductivity is stabilized at 100kOhm/cm without improvement since now one week. I was expecting dialysate to reach 1.8MOhm/cm after such a long time.
Hi Loic,
You might be able to reduce the conductivity further by removing divalent metal ions from your GO suspension. For example, if you used the modified Hummer's method to oxidize graphite, you still have Mn(II) ions associated with your GO. Dialysis alone won't do it. However, you can add the chelator EDTA to your GO suspension and then dialyze away the EDTA. This will remove most of the divalent/trivalent metal ions present.
However, GO has carboxylic acid groups and so will act as a weak electrolyte. This could be the primary reason you are not able to get the resistance higher through dialysis.
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