Dear all,
I hydrothermally treated (320°C 100 bar) an activated biochar (produced at 800°C in CO2 from softwood, 91% Carbon, 2% ash) and got XRD spectra from before and after the HT treatment. To be clear I first pyrolysed and activated the biochar before I treated it in hydrothermal conditions (in DI water and N2 gas).
Now I am wondering if anyone has an idea what the new broad peak around 12.2° might be (blue line - after HT treatment)?
The only thing I can imagine is graphene oxide however that would be a surprise after hydrothermal treatment (at least unexpected for me). As most labs are currently unaccessible to me, Raman is not an option right now.
XRD: Cu K-alpha X-radiation
Thank you!
I followed this question, because I was also surprised that it would be possible to change a material produced at 800 °C in a hydrothermal process operating at much lower temperature. However, revising this, at 320 °C the hydrothermal treatment is gasification process. In the end, you combined two (incomplete) gasification processes, one dry process using CO2 as gasification agent and one hydrothermal process, where water is not just the gasification agent, but an oxidant. It reacts to H2 and some oxidied carbon, lastly CO and CO2, but possibly the oxygen is first transferred into the solid phase yielding something like graphene oxide. After the dry process at 800 °C the oxygen content of the material is obviously low. Do you have any information about the oxygen or carbon content of the material after the hydrothermal treatment?
Paul Körner I found an open lab with Raman, so I will soon know more about it.
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