Table 2. Parameters of Langmuir, Freundlich, and Dubinin–Radushkevich Sorption Isotherm Models for the Adsorption of MB by a Polymer.

			value
sorption model	equation	parameter	linear	nonlinear
Langmuir		R2	0.9996	0.8678
		qm (mg g–1)	98	101.4
		L (L mg–1)	6.0	6.6
Freundlich		R2	0.5222	0.6079
		KF ((mg g–1)(L mg–1)1/n)	54.1	63.5
		n	5	7.80
Dubinin–Radushkevich		R2	0.6347
		k (mol2 J–2)	1.14 × 10–9
		Xm (mol g–1)	0.67 × 10–3
		E (kJ mol–1)	20.9
experimental capacity		qexp. (mg g–1)	97.3