Preparation, Characterization, and Application of Metakaolin-Based Geopolymer for Removal of Methylene Blue from Aqueous Solution

Table 7

Models isotherm constants for adsorption of MB using adsorbent.

Langmuir				Freundlich			Temkin			Dubinin–Radushkevich
Qm (mg/g)	KL (L/mg)	R^2	Range RL	KF (mg^(1−n)L^n/g)	1/n	R^2	AT (L/g)	BT	R^2	Qm (mg/g)	R^2	E (KJ/mol)
43.48	1.15	0.994	0.014–0.15	17.18	0.332	0.963	43.38	5.897	0.980	30.57	0.915	5.77