I am trying to make GO from charcoal powder,,from papers or online it seems to have brown colour but I am getting black colour,,what's causing it?
Method-
2.2. Synthesis of GO from Areca Nutshell Charcoal
For 30 min, H2SO4 (250 mL) was agitated in an ice bath environment with 10 g of graphite-based areca nutshell charcoal and 5 g of NaNO3. The color of the solution changed to a dark green when it was stirred for 3 h at 20 °C in an ice bath after adding 3 g of KMnO4. Afterward, the sample was taken out of an ice bath and stirred for a further 60 min at 35 °C. Then, 100 mL of deionized water was gradually introduced into the mixture and agitated for an hour. To eliminate the residual potassium permanganate, 5 mL of hydrogen peroxide was gradually added to the reaction mixture and then sterilized for 30 min. Deionized water was then added to the reaction mixture till neutrality was achieved, and then it was centrifuged to remove the precipitation. Further, the precipitate is kept at 120 °C for 5 h in an oven to obtain graphene oxide powder.
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