Characterization of H_𝟑PO_𝟒-Treated Rice Husk Adsorbent and Adsorption of Copper(II) from Aqueous Solution

Table 3

Kinetic parameters for the adsorption of Cu(II) by rice husk and H₃PO₄-treated rice husk.

Adsorbent	𝑞𝑒,exp (mg/g)	Pseudo-first-order model			Pseudo-second-order model
		𝐾1 (min^−1)	𝑞𝑒 (mg/g)	𝑅^2	𝐾2 (g/mg⋅min)	𝑞𝑒 (mg/g)	ℎ𝑜 (mg/g⋅min)	𝑅^2
Rice husk	0.4300	0.0219	0.4759	0.9507	0.0588	0.4888	0.0140	0.9974
H3PO4-treated rice husk	0.7408	0.0253	0.8498	0.9730	0.0440	0.8218	0.0300	0.9988