Can potassium nitrate be used?
Graphite oxide powders were prepared from it by a modification of Hummers and Offeman’s method. Hummers, W. S.; Offeman, R. E. J. Am. Chem. Soc. 1958, 80,
1339.
Sodium nitrate reacts with sulfuric acid by the following equation during synthesis of GO:
2 NaNO3 + H2SO4 = 2 HNO3 + Na2SO4.
Therefore you have a multiple reaction mixture that consists of sodium nitrate, sulfuric acid, potassium permanganate (also you have hydrogen peroxide) and other compouns that were the products of the reaction between these 3 components, such as nitric acid and so on. The intercalation of the graphite by the sulfuric acid can not take place without any another oxidizing agent. This agent is nitric acid that produced by the above-listed rection. Its more useful to use this rection as compared with nitric acid solution (its a problem to obtain this acid with higher 70-75% concentrations... you should use some exotic process).
Sodium nitrate reacts with sulfuric acid by the following equation during synthesis of GO:
2 NaNO3 + H2SO4 = 2 HNO3 + Na2SO4.
Therefore you have a multiple reaction mixture that consists of sodium nitrate, sulfuric acid, potassium permanganate (also you have hydrogen peroxide) and other compouns that were the products of the reaction between these 3 components, such as nitric acid and so on. The intercalation of the graphite by the sulfuric acid can not take place without any another oxidizing agent. This agent is nitric acid that produced by the above-listed rection. Its more useful to use this rection as compared with nitric acid solution (its a problem to obtain this acid with higher 70-75% concentrations... you should use some exotic process).
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