Table 3.

Nonlinear equilibrium model parameters for Pb(II) adsorption.

Isotherm	Parameters	Values
Langmuir	b (L mg‒1)	1.46
	Qmax (mg/g)	9.47
	${\mathrm{R}}_{\mathrm{Adj}}^2$	0.89
	R2	0.91
	RSS	2.89
Freundlich	Kf (mg g‒1) (mg‒1)1/n	5.06
	n	2.45
	${\mathrm{R}}_{\mathrm{Adj}}^2$	0.98
	R2	0.98
	RSS	0.56
Sips	qms (mg g‒1)	1564.64
	KS (L mg‒1)ms	0.003
	ms	0.40
	${\mathrm{R}}_{\mathrm{Adj}}^2$	0.97
	R2	0.98
	RSS	0.57
Hill	qH	185,675.49
	KD	36,684.36
	nH	0.40
	${\mathrm{R}}_{\mathrm{Adj}}^2$	0.97
	R2	0.98
	RSS	0.57
Redlich-Peterson	kRP (L g‒1)	305,231.43
	aRP (mg L‒1)‒bRP	60,301.59
	bRP	0.59
	${\mathrm{R}}_{\mathrm{Adj}}^2$	0.97
	R2	0.98
	RSS	0.56
Khan	qs (mg g‒1)	0.14
	bK	6244.36
	aK	0.59
	${\mathrm{R}}_{\mathrm{Adj}}^2$	0.97
	R2	0.98
	RSS	0.57