Removel of cationic dyes from water by solvent extraction using amphiphilic polyurethane reverse micelles

Several methods (e.g., adsorption, UV/H2O oxidation, precipitation) are normally employed to remove organic dyes and purify water.1 Recently liquid/liquid extraction technique using reverse micelle approach were gained more attention.2 The reverse micelles are nanometer-sized aggregates of amphiphilic molecules in nonpolar solvent. In this approach, to investigate removing organic dyes from water using a novel amphiphilic polyurethane reverse micelles(APU), experiments were conducted by mixing a know quanity of dye in aqueous phase and solvent-containing APU in a vial. The dye is solubilized in the hydrophilic core of the reverse micelles, which are present in the organic solvent phase. While phase transferring and receding the dye in aqueous phase, the organic phase was colorized. The oil layer was separated for a UV-vis measurement. The removel of different cationic dyes (e.g., methylene blue, malachite green, Nile blue and Rhodamine B, fuchsin) , and the anionic dyes including methyl orange (MO), Congo red and methyl blue (MeB) were studied by conducting experiments. The obtained results demonstrated that the lowest encapsulation were for the anionic guests, while the cationic dyes due to the ionic interactions between the dye and the APU was successfully encapsulated and transferred to organic phase,

کلیدواژه ها:

Amphiphilic polyurethane ، Reverse micelle ، Liquid/liquid extraction ، Removel of dyes.