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

Table 4

Summary of adsorption parameters (Freundlich model coefficients (K_F and n) and distribution coefficients (K_d)) obtained from adsorption results.

Adsorbent	Background	KF (mmol^1−nL^n/kg)^a	n^a	R^2	Log Kd (L/kg)
BC300	None	3100 ± 170	0.45 ± 0.02	0.984	2.83–3.71
	CTAB	2200 ± 110	0.57 ± 0.02	0.993	2.75–3.68
	SDBS	1200 ± 88	0.35 ± 0.03	0.938	2.30–3.33
	Tween 20	1000 ± 70	0.43 ± 0.03	0.967	2.31–3.21
BC500	None	4700 ± 140	0.34 ± 0.01	0.992	2.91–4.57
	CTAB	3400 ± 230	0.54 ± 0.03	0.985	2.93–3.57
	SDBS	1800 ± 90	0.42 ± 0.02	0.980	2.57–3.49
	Tween 20	1700 ± 90	0.31 ± 0.02	0.960	2.42–3.55
BC700	None	16000 ± 520	0.22 ± 0.01	0.980	3.24–5.50
	CTAB	3200 ± 290	0.44 ± 0.04	0.965	3.77–4.49
	SDBS	4400 ± 280	0.33 ± 0.03	0.960	2.72–4.28
	Tween 20	5700 ± 240	0.31 ± 0.02	0.981	2.83–4.58

^aValues after ± sign indicate relative standard deviation.