Modified Hummer's Offeman Method
A) Low Temperature Stage
1) 5g Graphite 115mL H2SO4 (98%) 2.5g NaNO3
mix in an ice bath for 30 mins
2) 15g KMnO4
Slowly add, while stirring, over one hour. Stir for an additional hour keeping the temp below 5oC.
B) Mid Temperature Stage
Raise temperature to 45oC and stir for one hour.
C) High Temperature Stage
230mL distilled water
Add 230mL water. Stir 30 for mins at 45oC
600mL distilled water
150mL H2O2 (9%)
add to mix
Wash in 5% HCL then distilled water. Dry
Add dried cake to 50mL of water and stir. Leave for 24 hours and filter. Discard filtrate. Solution is GO in water.