I have added the 300 ml H2So4 and 100ml HNO3 for oxidation purpose. Red-brown fumes (NO2 gas) were getting out of the solution after 45 minutes ultrasonication. Is it a part of oxidation process or is it going wrong and should I continue the reaction or stop it immediately?
Dear Alok kumar Srivastava,
I observed the formation of brown fumes when a small quantity of water comes in contact with the solution you mentioned above. It is due to the evolution of Nitrogen oxides.
But the oxidation reaction whether it is occurred or not can be confirmed by carrying out the FTIR analysis.
I repeated the experiment when the fumes are observed.
Anas
The solution used is an strong oxidizing agent (nitric acid) and appears to be oxidizing the carbon fiber and generating nitrous oxide fumes and probably CO2. If so, the reaction may not stop until all the fiber is gone of acid is consumed.
You may want to read the article below.
Selectivity of chemical oxidation attack of single-wall carbon nanotubes in solutionNovember 2003Physical Review B 68(19) DOI10.1103/PhysRevB.68.193412
review Wikipedia under HNO3, oxidation reactions with carbon are there, in your case it definitely involves one with NO2 evolution (brown fumes).
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