Table 3. Isothermal adsorption model of dye on biochar

Feedstock		Carbonization temperature (℃)	Dye	Isothermal adsorption model	Adsorption capacity (mg/g)	Ref.
Wood and waste wood	Eucalyptus	400	Methylene blue	Langmuir model	2.06	[8]
	Palm bark	400	Methylene blue	Langmuir model	2.66	[8]
	Wattle bark	500	Methyl orange	Bangham model	12.26	[13]
Others	Switchgrass	600900	Methylene blueOrange GCongo red	Langmuir model	196.138.222.6	[19]
	Macroalgae	400600800	Malachite greenCongo redCrystal violet	Freundlich modelPseudo-second-order model	1,384.8557.2106.5	[20]
	Mimosa plants	500	Methyl orange	Bangham model	12.33	[13]
	Wakame	800	Methylene blueRhodamine BMalachite green	Pseudo-second-order modelLangmuir model	840.34574.714,304.72	[21]
	Anaerobic digestion residue	400	Methylene blue	Langmuir model	9.50	[8]
	Coffee husks	500	Methyl orange	Bangham model	12.34	[13]