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The present study deals with the preparation of carbonaceous materials from flavonoid tannin by a two-step process: hydrothermal carbonisation (HTC) at 180°C in aqueous solution, followed by pyrolysis at 900°C. Whereas such process and the resultant materials have been described elsewhere (Braghiroli et al., 2014), two modifications of the HTC step were introduced and investigated for the first time:...
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