Biosorption of Zinc from Aqueous Solution Using Chemically Treated Rice Husk

Table 2

Isotherm parameters for the adsorption of Zn²⁺ by untreated rice husk and NaOH-treated rice husk.

Adsorbent	Freundlich model			Langmuir model
	𝐾𝐹	1/𝑛	𝑅^2	𝑘𝑎 (L/mg)	𝑞𝑚 (mg/g)	𝑅^2
Untreated rice husk	0.47	0.36	0.9303	12.84	12.41	0.9976
NaOH-treated rice husk	2.21	0.80	0.9732	7.32	20.08	0.9985