Magnetite Functionalized Nigella Sativa Seeds for the Uptake of Chromium(VI) and Lead(II) Ions from Synthetic Wastewater

Table 3

Kinetic models and their parameters.

Models		FNS		PNS
		Pb(II)	Cr(VI)	Pb(II)	Cr(VI)
PFO	(mgg^-1)	35.20	8.64	30.98	14.15
	(m^-1)	0.10	0.17	0.07	0.96
		0.9979	0.9938	0.9947	0.9976
PSO	(mgg^-1)	33.24	18.32	23.71	20.67
	(gmg^−1 min^−1)	0.0377	0.1370	0.0419	0.0743
		0.9024	0.8481	0.7415	0.8969
IPD		15.48	4.11	13.09	9.06
	(g g^-1 min^0.5)	1.7716	0.4202	2.3475	0.6298
		0.917	0.719	0.941	0.876
EPA	%	59.00	53.92	62.98	42.48
ESA	%	41.00	46.08	37.02	57.52
Experimental () (mgg^-1)		37.76	8.92	35.36	15.75

EPA: estimated pore sorption; ESA: estimated surface sorption.