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

Table 4

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

Adsorbent	Freundlich model			Langmuir model
	𝐾𝐹	1/𝑛	𝑅^2	𝐾𝑎 (L/mg)	𝑞𝑚 (mg/g)	𝑅^2
Rice husk	0.4267	0.4197	0.9402	0.3403	1.6173	0.9559
H3PO4-treated rice husk	7.1187	0.3594	0.9303	0.9915	17.0358	0.999