Research Article

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

Table 2

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

AdsorbateLangmuirFreundlich
n

Phenol127.320.1140.6040.9810.1281.0470.996
o-Cresol46.230.3300.9050.9450.8541.4960.979
o-Aminophenol45.690.4450.9110.9500.8921.4140.997
o-Chlorophenol376.892.9400.2980.6301.8481.0000.997
o-Nitrophenol548.283.1520.3640.7644.0881.1470.987
2,6-Xylenol398.942.0600.8320.7083.2621.2310.975
2,5-Xylenol64.230.2740.6080.9481.4751.9030.908
3,5-Xylenol30.900.2410.8580.9541.3502.0970.979
3,4-Xylenol12.160.0970.8540.9810.0290.9010.970