Table 7.

Non-linear kinetic model parameters at room temperature.

Model Parameter	Adsorbent
	Bentonite	Organobentonite	Kaolin	Organokaolin
	qe (mg/g) = 10.742	14.960	1.830	1.007
Pseudo-first order
qm (mg/g)	9.624	12.012	1.916	1.139
K1 (1/min)	0.0186	0.0134	0.0218	0.0142
R2	0.9960	0.9839	0.9926	0.9700
RMSE	0.3605	7.741	0.1025	0.1211
χ2	0.0186	0.0601	0.0015	0.0021
Pseudo-second order
qm (mg/g)	12.078	16.565	2.430	1.496
K2 (g/mg $\times$ min)	0.00192	0.00105	0.00174	0.00196
R2	0.9903	0.9933	0.9708	0.9648
RMSE	4.929	0.6569	0.2043	0.1341
χ2	0.02432	0.04316	0.00596	0.00257
Intra-particle diffusion
Kid(mg/g.min1/2)	0.64143	0.0532	0.1252	0.0815
C	1.7094	2.8607	0.3529	0.01625
R2	0.9658	0.9116	0.9654	0.9352
RMSE	10.3039	2.3850	1.8455	0.1817
χ2	0.1064	0.5691	0.00341	0.00471