Table 2. BET surface area and pH of biochars produced from seaweeds. NQ – not applicable (not quantified by that study). The pH data are mean values ± S.E. and are calculated based on analysis of three independent biochar samples from each sample origin for each species. South Sulawesi and Java (Indonesia).

Species	Origin	BET (m2 g−1)	pH (CaCl2)
Gracilaria	South Sulawesi	2.02	7.6 ± 0.2
	Java	3.55	8.1 ± 0.1
Eucheuma	South Sulawesi	30.03	8.2 ± 0.2
	Java	34.82	8.6 ± 0.1
Kappaphycus	South Sulawesi	2.24	8.8 ± 0.1
	Kiribati	2.84	9.0 ± 0.1
Saccharina	China	1.29	11.0 ± 0.3
	Korea	8.48	11.2 ± 0.1
Sargassum	China	7.46	10.8 ± 0.1
	Indonesia	2.51	10.1 ± 0.2
Undaria	China	1.33	9.9 ± 0.1
	Korea	8.87	10.9 ± 0.1
Macroalgae (saltwater)2	NA	1.15–1.81	6.1–10
Macroalgae (freshwater)3	NA	8.29	7.8
Microalgae (saltwater)11	NA	10.7–20.7	7.2–7.9
Bagasse10	NA	259–452	NQ
Bagasse (activated)10	NA	441–570	NQ