Activated Carbon from Prickly Pear Seed Cake: Optimization of Preparation Conditions Using Experimental Design and Its Application in Dye Removal

Table 6

Langmuir and Freundlich isotherm parameters at 20°C.

Langmuir	Freundlich
qm = 257.86 mg·g^−1	KF = 169.85 ((mg·g^−1) (L·mg^−1)^1/n)
KL = 0.3936 L·mg^−1	n = 12.31
R^2 = 0.993	R^2 = 0.999
4.22