Filter GO with micro pore filter paper and washed with Dil.HCl and re disperse in Milli-Q water. repeat this process 5 to 6 times to become GO neutral. just go to my profile and see.
Please see our paper on Bulletin of the Chem. Soc. of Japan, which is attached to this mail. You can control the oxidation state of GO and layer structure and size. See Experimantal on p.334.
for purification of synthesized graphene oxide you can also follow links given below:
1. http://bucky-central.me.utexas.edu/RuoffsPDFs/Synthesis_and_exfoliation_of_isocya_nate-treated_graphene_oxide_nanoplatelets.pdf
where in experimental section they have mentioned the process involved.
2. http://www.readcube.com/articles/10.1038/srep01378
gum arabic is cheap and readily available from sigma aldrich: http://www.sigmaaldrich.com/catalog/search?interface=All&term=Gum%20arabic&N=0&mode=partialmax&focus=product&lang=en®ion=IN&F=PR&ST=RS&N3=mode%20matchpartialmax&N5=All
See the link http://instanano.com/nanomaterial-synthesis/carbon-nanomaterial/graphene-oxide-washing/
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