What do you think or suggest is the best route for purifying graphene oxide that is prepared chemically by the Hummers' method?
It is known that this step is tedious, also due to the low pH of the resultant mixture. But most papers fail to mention what kind of filter papers are using or the speed (in RCF rather than RPM) when a centrifuge is used.
Any comments/suggestions are welcome.
Thanks in advance!
hi
that's how I did that: resultant mixture was centrifuged many times for 10 minutes with 15000 rpm speed. I determined the pH of the mixture every time and when it reached to water pH, I stopped doing that. as you said it is a tedious step of synthesis of graphene.
This search can be found to take advantage:
Preparation and characterization of graphene oxide nanosheets
Procedia Engineering
Volume 32, 2012, Pages 759-764
thanks
There are filtration, centrifugation and dialysis for removing ions. Tölle et al. also proposed a new method for GO purification. For more information you can refer to the following references:
Article Scale-up and purification of graphite oxide as intermediate ...
Chapter Graphite Oxide Story - From the Beginning Till the Graphene ...
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