Adsorption of 17α-Ethinyl Estradiol and Bisphenol A to Graphene-Based Materials: Effects of Configuration of Adsorbates and the Presence of Cationic Surfactant

Table 2

Summary of adsorption parameters [Freundlich model coefficients ( and ) and distribution coefficients ()] obtained from adsorption results.

Adsorbate	Adsorbent	Background	Freundlich model			Langmuir model			(L kg^-1)
			(mmol^1-nL^n kg^-1)^a	^a		(mmol kg^-1)^a	^a
EE2	GO	Buffer			0.958			0.944	3.65-4.38
		CTAB			0.998			0.997	4.86-5.42
	RGO_1	Buffer			0.992			0.984	4.21-5.31
		CTAB			0.997			0.997	4.79-5.43
	RGO_2	Buffer			0.987			0.998	5.64-6.33
		CTAB			0.960			0.961	4.66-5.23
	CG	Buffer			0.973			0.918	4.67-7.15
		CTAB			0.996			0.960	4.54-6.44
BPA	GO	Buffer			0.985			0.984	3.08-3.49
		CTAB			0.998			0.997	4.83-5.52
	RGO_1	Buffer			0.997			0.998	3.27-3.77
		CTAB			0.995			0.994	4.74-5.56
	RGO_2	Buffer			0.995			0.994	3.99-4.27
		CTAB			0.998			0.998	4.50-4.93
	CG	Buffer			0.991			0.950	4.18-5.45
		CTAB			0.999			0.989	4.46-5.47

^aValues after “±” sign indicate relative standard deviation.