TABLE 3.

Adsorption isotherm model parameters.

Parameters	Lignin	Fe3O4@lignin
		1:0.5	1:1	1:2	1:3
Langmuir
qm (mg/g)	28.72	470.02	206.29	25.30	27.10
b (× 10–2 L/mg)	1.10	0.11	0.28	2.27	2.33
R2	0.96	0.98	0.98	0.97	0.93
RL = 1/(1+bC0)	0.90	0.98	0.97	0.78	0.81
Freundlich
Kf (L/g)	2.28	0.42	0.74	1.97	1.99
1/n	0.41	0.98	0.95	0.44	0.44
R2	0.80	1.00	0.98	0.89	0.82