Adsorption of Cd (II) Using Chemically Modified Rice Husk: Characterization, Equilibrium, and Kinetic Studies

Table 5

Parameters of Langmuir and Freundlich adsorption isotherms.

Rise husk	Type of adsorbent
	S2	S2-NaOH
Langmuir model
(mg/g)	5.13	11.06
(L/mg)	0.237	0.393
	0.995	0.987
Freundlich model
	2.11	4.31
	4.96	4.23
	0.976	0.976
Hill model
	5.09	12.72
	4.58	2.54
	1.06	0.66
	0.982	0.988
Redlich-Peterson model
	1.29	6.75
	0.27	0.91
	0.98	0.90
	0.98	0.99
Temkin model
	0.81	1.80
	6.73	7.93
	0.94	0.98