A PTFE vessel was used as a reaction vessel to carbon coat magnetite NPs using glucose at 180C for 12 hrs. The interior of the vessel was blackened by the carbon deposits. It was soaked for long time in concentrated HCl,. We managed to clean it from magnetite. However, the black layer was still there.
I greatly appreciate if someone can suggest how to clean the vessel interior from carbon deposits.
I believe that out of all the commonly used cleaning agents, the so called "piranha solution" (H2SO4+H2O2) would be the best suited for your case, as it does not harm PTFE and readily removes carbon and organic impurities.
For the details, please refer to the enclosed file (available from: https://engineering.tufts.edu/microfab/documents/SOP_PiranhaClean.pdf).
Tomasz Jarosz I have tried H2SO4 alone and it did some cleaning. I will test it and let you know. Thank you very much for your kind help
Mohammad Al-Harahsheh, you are welcome - did the Piranha solution give good results?
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