Reverse micelles for the removal of dyes from aqueous solutions.
The ability of reverse micelles to solvate organic dyes in the aqueous core was investigated with methyl orange (MO) and methylene blue (MB) using hexadecyl trimethyl ammonium bromide (HTAB) and sodium dodecyl benzene sulphonate (SDBS) surfactants in a polar amyl alcohol medium. The removal trend of the dyes from water was studied with different concentrations of the dyes. The effects of NaCl and CaCl2 salts on removal efficiency of the surfactants were investigated and results were compared. It was observed that the separation of dyes from the aqueous phase to the organic phase depends on the electrostatic interaction between the dye molecule and surfactant head groups. In the case of NaCl, with increasing salt concentration, the removal (%) of dye decreases. For CaCl2, removal of methyl orange shows a gradual increase with increasing dye concentration, whereas, for methylene blue, its removal decreases with increasing dye concentration.
School of Environmental Sciences, Department of Botany, Institute of Technology, Banaras Hindu University, Varanasi 221 005, India. sanjaymaji@gmail.com
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D005591:Chemical Fractionation / Q000379:methods; D003102:Colloids / Q000737:chemistry*; D004396:Coloring Agents / Q000737:chemistry* / Q000302:isolation & purification*; D007220:Industrial Waste / Q000517:prevention & control; D008823:Micelles; D012996:Solutions / Q000737:chemistry; D013501:Surface-Active Agents / Q000737:chemistry*; D014867:Water / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000737:chemistry / Q000302:isolation & purification*; D018508:Water Purification / Q000379:methods*
D003102:Colloids; D004396:Coloring Agents; D007220:Industrial Waste; D008823:Micelles; D012996:Solutions; D013501:Surface-Active Agents; D014874:Water Pollutants, Chemical; D014867:Water