I want to remove sulfur atoms in carbon materials.
There are doping 'S' graphene methods in google, but I want to do the opposite.
Please help. :0
Oh my, S is a nasty thing to get rid of. In classical organic wet chemistry there are a few tools to do that, but none of them is "tasty". Mercury "loves" S so HgCl2 is still in use there. Another way is Raney-Nickel, but I have no idea how you would separate that from your graphene after using it.
You could try heating it in a hydrogen atmosphere, maybe you can cause a thermal reduction as it can be done with oxides. I don't guarantee that will work, but it may be worth a try.
Thx. I'll try that you said. I think heating in H2 gas is easier than other methods in my lab, but I really pray to keep the mass or get thermal reduction little.
OK. Regarding the temperature: in section 9 of the supplementary material to this work of mine:
Article Formation of Sublimable Nanographene Oxides by Reacting Coro...
you find TPD spectra of oxidized graphite and Coronene (=nanographene) which were recorded by simple heating in vacuum (no hydrogen yet). In both cases the hydrogen-free thermal reduction1 initiated at 380K and had its first peak around 625K. This excellent XPS work from the Elettra/Trieste people points in a similar direction:
Article Atomic Oxygen on Graphite: Chemical Characterization and The...
So maybe that's a temperature range for the first experiments because the system should become reactive there.
1The term "thermal reduction" is commonly used for this process in the literature. I am not a fan of this term because a reduction would imply that the carbon just changes its oxidation state while in this hydrogen-free case it just flies away. It will be interesting what happens to sulfur. If you have access to a reactive TPD setup you could actually try to monitor H2S desorption at a given pressure as a function of temperature.
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