Adsorption of Bisphenol A on Peanut Shell Biochars: The Effects of Surfactants

Table 3

Selected physicochemical properties of BC300, BC500, and BC700.

	C (wt%)^a				Total C (wt.%)^a	Total O (wt.%)^a	Total N (wt.%)^a	(O + N)/C ratio^a	Specific surface area^b (m^2·g^−1)	Pore volume^c (cm^3·g^−1)	Pore diameter^c (nm)	pHpzc^d
	C-C/C=C	C-O	C=O	COOH
BC300	54.38	29.41	11.55	4.660	70.82	18.14	2.550	0.292	0.890	0.0058	25.4	7.34
BC500	68.68	16.23	10.80	4.300	73.33	16.56	2.250	0.256	58	0.053	3.66	9.93
BC700	74.00	11.66	10.32	4.030	75.02	14.81	2.150	0.226	376	0.23	2.32	10.2

^aAnalyzed using X-ray photoelectron spectroscopy. ^bSpecific surface area measured using the Brunauer–Emmett–Teller (BET) method. ^cVolume of micropores (smaller than 20 Å in diameter) was determined using the Horvath–Kawazoe method. ^dDetermined by a modified pH-drift method.