Table 2.

Estimated adsorption parameters of Langmuir, Freundlich and Sips isotherms at room temperature.

Langmuir Adsorption Model		GnP		CNF		CNF–GnP 3:1
		MB	CR	MB	CR	MB	CR
qe = (qmaxKLCe)/(1 + KLCe)	qmax (mg g−1)	567.1	1787.3	1387.2	351.7	1178.5	585.3
	KL (L g−1)	7.0 × 10−2	7.1 × 10−3	8.3 × 10−2	8.6 × 10−4	1.1 × 10−1	3.8 × 10−3
	R 2	0.879	0.858	0.984	0.960	0.985	0.980
Freundlich adsorption model		GnP		CNF		CNF –GnP 3:1
		MB	CR	MB	CR	MB	CR
qe = KF × Ce1/n	n	5.431	2.995	4.512	1.428	4.984	1.944
	KF (mg g−1)	181.3	156.1	376.5	0.966	364.2	29.9
	R 2	0.773	0.719	0.902	0.935	0.892	0.864
Sips adsorption model		GnP		CNF		CNF –GnP 3:1
		MB	CR	MB	CR	MB	CR
1/qe = (1/qmaxKs) × (1/Ce)1/n + (1/qmax)	qmax (mg g−1)	552.4	1515.0	1453.0	235.2	1231.1	517.9
	Ks (L g−1)	4.1 × 10−2	2.3 × 10−4	1.2 × 10−1	1.0 × 10−4	1.5 × 10−1	6.8 × 10−4
	n	0.819	0.534	1.222	0.727	1.243	0.723
	R 2	0.869	0.885	0.991	0.960	0.988	0.969