The Equilibrium, Kinetics, and Thermodynamics Studies of the Sorption of Methylene Blue from Aqueous Solution Using Pulverized Raw Macadamia Nut Shells

Table 5

Kinetic model plot constants.

Kinetic models	Concentration
	1.25 g/L	2.5 g/L
Pseudo first order
qe (mg/g)	5.27	2.06
K1 (min^−1)	0.0127	7.13 × 10^−3
R^2	0.872	0.714
Pseudo second order
qe (mg/g)	17.92	11.34
K2 (g/mg min)	8.66 × 10^−3	0.03
R^2	0.999	0.999
Elovich
(mg/g min)	7.64 × 10^2	9.23 × 10^5
	0.66	1.65
R^2	0.964	0.905
Intraparticle diffusion
kp (mg/g min^1/2)	0.352	0.129
C	12.46	9.28
R^2	0.89	0.81