Adsorption of Toluene and Paraxylene from Aqueous Solution Using Pure and Iron Oxide Impregnated Carbon Nanotubes: Kinetics and Isotherms Study

Table 3

Isotherm models parameters for toluene and p-xylene adsorption.

Model	Parameters	Toluene		p-xylene
		Pure CNTs	CNTs-iron oxide	Pure CNTs	CNTs-iron oxide
Langmuir	(L/mg)	0.005	0.002	0.008	0.003
	(mg/g)	127.94	381.18	219.51	458.52
	(%)	98.5	97.6	99.7	99.4
Freundlich		0.71	0.79	3.18	1.93
		1.08	0.99	1.32	1.11
	(%)	98.3	97.6	99.5	99.3
Dubinin-Radushkevich (D-R)	(mg/g)	24.62	39.11	76.32	100.58
	B (mole^2/kJ^2)	72.87	99.73	99.81	349.98
	(kJ/mole)	0.08	0.07	0.07	0.04
	(%)	99.2	99.2	99	98.4