Table 5.

Kinetics parameters for malachite green dye adsorption.

Pseudo first order	Pseudo second order	Intraparticle diffusion	Boyd model
R2 = 0.91	R2 = 0.99	R2 = 0.94	R2 = 0.95
K1 (min−1) = 1.47	K2 (g/mg min) = 0.58	$k_d$(mg/g min0.5) = 0.21	F = 0.92
Qe cal (mg/g) = 104.51	Qe cal (mg/g) = 121.24	C(mg/g) = 2.14	Bt=2.028
Reduced Chi-square = 0.26	Reduced Chi-square = 0.004	Reduced Chi square = 0.0061	Reduced Chi square = 0.36