Elemental analysis of biochar from the pyrolysis of Sargassum sp.

Sample	Ultimate analysis (wt%, dry ash-free)					HHV (MJ kg−1)
	% C	% H	% N	% S	% O
Feedstock	42.40 ± 0.38	5.86 ± 0.03	2.72 ± 0.01	2.78 ± 0.05	46.24 ± 0.30	14.46 ± 0.08
Biochar (400 °C)	51.28 ± 0.06	3.05 ± 0.06	1.38 ± 0.02	2.48 ± 0.06	41.82 ± 0.04	23.12 ± 0.06
Biochar (500 °C)	52.58 ± 0.06	2.99 ± 0.04	1.32 ± 0.01	2.45 ± 0.03	40.65 ± 0.04	24.12 ± 0.09
Biochar (600 °C)	54.01 ± 1.12	2.89 ± 0.07	1.24 ± 0.03	2.38 ± 0.04	39.48 ± 0.90	25.89 ± 0.10
Low-rank coal-lignite52	58.78	4.9–7.0	0.6–2.4	0.3–6.0	12–30	12.00–25.0053