Biosorption of Zinc from Aqueous Solution Using Chemically Treated Rice Husk

Table 1

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

Adsorbent	Pseudo-first-order model			Pseudo-second-order model
	𝐾1 (min^−1)	𝑞𝑒 (mg/g)	𝑅^2	𝐾2 (g/mg⋅min)	𝑞𝑒 (mg/g)	ℎ0 (mg/g⋅min)	𝑅^2
Untreated rice husk	0.02	7.59	0.9507	0.0008	10.27	0.0844	0.9974
NaOH-treated rice husk	0.03	16.90	0.9719	0.0017	22.83	0.8861	0.9912