The adsorption of phenol and ten substituted phenols on activated carbon was examined. For a comparative study, the substituted phenols were selected after nature, position, and number of functional groups; they are: o-, m-, p-cresol, o-, m-, p-chlorphenol, m-, p-nitrophenol, resorcine, and methyl-resorcine, p-chloraniline was also studied. The single solute data were statistically fitted on 13 isotherm models: the Freundlich, Langmuir, Freundlich-Langmuir, BET, Dubinin-Raduskevitch, the three parameters empirical equation proposed by Radke and Prausnitz, Redlich-Petersen, Tdth, Myers, as well as generalised, Volmer, virial and sigmoidal isotherms. A computer program was developed to determine the most precise parameter models. The prediction results on the adsorption isotherms are compared by absolute relative percent deviations.
The present paper deals with the competitive adsorption on activated carbon of three aqueous bi-solute systems (phenol/p-nitrophenol, phenol/pchlorphenol, p-nitrophenol/p-chlorphenol) and of the tri-solute system phenol/p-nitrophenol/p-chlorphenol. In this context two experimental methods to evaluate the equilibrium characteristics for the adsorption of phenols on powdered activated carbon were used. The competitive adsorption data were statistically fitted on four models: the Langmuir competitive model, the Freundlich-Langmuir competitive model, and the Fritz-Schlunder model, the last one in two particular cases for the monosolute representation. The prediction for all models, excepting the FritzSchlunder model, were performed using only single-solute data, while the parameters for the Fritz-Schlunder model were obtained using both single and multi-solute data.
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