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In this paper, ionic liquids [C 6 mim][BF 4 ] and [C 8 mim][BF 4 ] have been used, for the first time, as alternative solvents for the extraction of organic pollutants such as phenols and phenyl amines from aqueous solution. The experimental results shown that partition coefficients of these compounds were strongly affected by pH of aqueous phase, and the molecular forms of these solutes were found to be efficiently extracted by the ionic liquids. This suggested that the partitioning of the phenols and phenyl amines was driven mainly by the dispersion interactions between the molecular forms of the solutes and cation of the ionic liquids and the hydrogen bonding interactions between the solutes and anion of the ionic liquids. Thermodynamic properties have also been determined for representative extraction processes. It is shown that the partitioning process is exothermic in nature and controlled by enthalpy term. Preliminary recovery experiments suggest that [C 8 mim][BF 4 ] ionic liquid may be adapted to removal organic pollutants from aqueous solution with good recycling.

Equilibrium Partitioning of Phenols and Phenyl Amines between [BF 4 ] - Based Ionic Liquids and Aqueous Solution