Making activated charcoal is not like you described. It's a lot more than just removing air from the equation. All you are making with your method is charcoal. That is not the same as activated charcoal, which is what is used for water treatment. Activated charcoal is usually heated in a chamber of inert gas then acid washed to remove the fly ash. In fact one method, oxidation, introduces oxygen into the chamber to create it. Activated charcoal and char cloth are steeds of different hues.
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