The Removal of Phenol and Its Derivatives from Aqueous Solutions by Adsorption on Petroleum Asphaltene

Table 3

Isotherm constants and regression data for Langmuir-Freundlich and Temkin isotherms for adsorption of substituted phenols on asphaltene from aqueous solutions.

Adsorbate	Langmuir-Freundlich			Temkin
	𝐾𝐺	𝑁𝑏	𝑅^2	𝐴𝑇	𝑏𝑇	𝑅^2
Phenol	1166.16	1.010	0.998	0.056	382	0.944
o-Cresol	121.21	0.970	0.975	0.089	275	0.953
o-Aminophenol	86.00	0.954	0.986	0.154	316	0.929
o-Chlorophenol	7547.45	1.00	0.997	0.079	30	0.937
o-Nitrophenol	154.75	0.96	0.982	0.216	56	0.886
2,6-Xylenol	178.52	0.98	0.987	0.098	43	0.936
2,5-Xylenol	139.82	0.89	0.913	0.067	233	0.854
3,5-Xylenol	82.29	0.90	0.927	0.090	396	0.894
3,4-Xylenol	20.28	0.62	0.320	0.997	0.632	0.958