Table 2.

Adsorption kinetics parameters of toluene and p-xylene adsorption.

Model	Parameters	Toluene		p-xylene
		Pure CNTs	CNTs-iron oxide	Pure CNTs	CNTs-iron oxide
	C o	60.70	60.70	47.78	47.78
Experimental	q e,experimental	76.04	79.87	81	79.11
Pseudo-first-order	k 1(min−1)∗10−3	5.3	3.1	4.7	4.2
	q e,calculated	7.43	6.94	4.92	5.10
	R 2 (%)	95	80	97	97
Pseudo-second-order	k 2 (g mg−1 min−1)∗10−4	0.69	0.32	3.9	3.1
	q e,calculated	107.53	128.21	87.72	86.96
	R 2 (%)	98	80	99.9	99.7
Intraparticle diffusion model	k id (g mg−1 min−0.5)	4.04	4.51	1.96	1.97
	C	4.74	−6.99	46.66	43.23
	R 2  (%)	91	93	85	96