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

Table 1

Selected physicochemical properties of GO, RGO_1, RGO_2, and CG.

Graphene materials	Element composition (wt%)^a			Relative hydrophobicity index^b	ζ potential^c	Pore volume (cm^3 g^-1)^d		Average pore diameter (nm)^d	BET surface area (m^2 g^-1)^d
	C	O	C/O			Micropore	Mesopore macropore
GO	69.38	29.76	2.33			0.004	0.050	13.73	68.56
RGO_1	70.38	26.71	2.63			0.015	0.030	6.07	56.70
RGO_2	78.04	21.07	3.70			0.038	0.393	3.75	102.24
CG	79.39	16.12	4.92			0.018	0.178	10.78	78.51

^aAnalyzed using X-ray photoelectron spectroscopy. ^bDetermined by the method reported by Walker et al. [33]. ^cMeasured in 10 mM Na₂HPO₄/NaH₂PO₄ buffer. ^dAnalyzed using surface area and porosimetry system.