Table 1.

Kinetic parameters for the adsorption of BB41 onto cocoa shell

Kinetic models	Initial concentration (mg/L)
	5	10	15	20	25
Pseudo-first-order
K1 (min−1)	0.012	0.008	0.068	0.157	0.087
qe (mg/g)	0.106	1.102	0.362	0.539	0.821
R2	0.921	0.789	0.846	0.915	0.949
Pseudo-second-order
K2 (g/mg/min)	3.815	0.423	0.564	0.530	0.292
qe (mg/g)	1.128	2.262	3.546	4.736	5.845
R2	0.999	0.998	0.999	0.99	0.999
Elovich
β (g/mg)	66.66	7.462	6.172	5.465	3.105
α (g/mg/min)	0.062	0.233	0.120	0.055	0.128
R2	0.958	0.917	0.859	0.870	0.919
Intraparticle diffusion
Kid (g/mg/min)	0.008	0.073	0.083	0.094	0.168
R2	0.968	0.845	0.691	0.697	0.757
Boyd
R2	0.922	0.789	0.847	0.915	0.950