Table 2. Adsorption Isotherm Parameters for 250 mg/L PFOA Adsorption onto PAC^a.

PAC material	Freundlich parameters	Langmuir parameters
WWPAC	KF = 16.92 ± 0.82	KL = 0.00574 ± 4.2 × 10–4
	1/n = 0.657 ± 0.010	qmax = 985.04 ± 42.84
	R2 = 0.760	R2 = 0.790
AWPAC	KF = 125.88 ± 2.17	KL = 0.0618 ± 0.0060
	1/n = 0.265 ± 0.003	qmax = 505.87 ± 7.46
	R2 = 0.977	R2 = 0.873
PAC-1050	KF = 85.99 ± 7.58	KL = 0.0283 ± 0.0044
	1/n = 0.341 ± 0.020	qmax = 571.47 ± 26.20
	R2 = 0.960	R2 = 0.949

^aq_max (mg/g), K_L (L/mg), K_F (mg×L_^1/n×g_^–1×mg_^–1/n), n (dimensionless).