Fig. 2From: Biochar synthesis from mineral and ash-rich waste biomass, part 2: characterization of biochar and co-pyrolysis mechanism for carbon sequestrationA van Krevelen diagram (b) of the biochar types under study; and plot of H/C vs Ash/C (a) showing mineral and ash-rich biochar (MAB) defined by H/C ⩽ 0.7 and Ash/C ⩽ 4.1Back to article page