Table 2.

Kinetic parameters for DC adsorption on AC and MAC.

Kinetic model	Parameters	Adsorbents and initial concentrations
		AC 100 mg/L	MAC 100 mg/L	AC 50 mg/L	MAC 50 mg/L
Pseudo-first-order
	K 1 (1/min)	0.0361	0.0332	0.0341	0.0373
	q e (mg/g)	43.39	41.07	21.96	21.82
	R 2	0.979	0.982	0.989	0.987
Pseudo-second-order
	K 2 (1/min)	9.7 × 10−4	6.6 × 10−4	2.1 × 10−3	1.4 × 10−3
	q e (mg/g)	43.10	40.98	23.75	21.28
	R 2	0.994	0.983	0.996	0.987
Power function
	α	4.14	2.32	3.45	1.01
	b	0.48	0.55	0.38	0.99
	R 2	0.97	0.89	0.91	1.00
Natarajan and Khalaf
	K N (1/min)	0.0060	0.0040	0.0070	0.0050
	R 2	0.725	0.720	0.750	0.720
Intraparticle diffusion
	K diff (mg/g min1/2)	2.34	2.36	1.24	1.21
	C	9.06	4.22	6.12	2.95
	R 2	0.816	0.822	0.806	0.807