Removal of Methylene Blue from Aqueous Solution Using Agricultural Residue Walnut Shell: Equilibrium, Kinetic, and Thermodynamic Studies

Table 4

Adsorption parameters of methylene blue on the walnut shell powder at different temperatures.

Isotherm	Parameter	/K
		298	308	318	328
Langmuir		0.999	0.979	0.971	0.987
	/mg⋅g^−1	51.55	49.83	56.13	55.96
	/L⋅mg^−1	0.419	0.181	0.163	0.119
Freundlich		0.981	0.972	0.963	0.987
		18.80	15.86	13.00	10.50
		0.270	0.323	0.357	0.464
D-R		0.987	0.998	0.989	0.995
	/kJ⋅mol^−1	16.13	22.44	12.64	15.15