Foam Separation of Dyes Using Anionic, Cationic, and Amphoteric Surfactants

Journal of Oleo Science
Yusuke GotoKeisuke Matsuoka

Abstract

Foam separation can selectively remove a target substance from a solution via adsorption of the substance with the surfactant at the surface of the bubble. A cationic dye, methylene blue, and an anionic dye, Fast Green FCF, were prepared as substances to be removed via foam separation. Anionic (sodium dodecyl sulfate, SDS), cationic (dodecyltrimethylammonium chloride, DTAC), and amphoteric (3-(dodecyldimethylammonio)propane-1-sulfonate, SB-12) surfactants were used in the foam separation process. The effectiveness of the surfactants for removing the cationic methylene blue increased as follows: DTAC < SB-12 < SDS. On the other hand, the effectiveness of the surfactants for removing the anionic Fast Green FCF was in the opposite order. The dyes were effectively adsorbed by the foams via electrostatic interactions between the oppositely charged surfactant and the dye molecules. Since amphoteric surfactants have both anionic and cationic charges in a molecule, they could effectively remove both dyes in the foam separation process. Therefore, it was found that the amphoteric surfactant was highly versatile. Analysis of the kinetics of the removal rate showed that the aqueous solutions of monomers could remove the dyes more effectiv...Continue Reading

References

May 18, 2005·Journal of Colloid and Interface Science·Feryal Akbal
Jun 3, 2008·Langmuir : the ACS Journal of Surfaces and Colloids·Kamalakanta Behera, Siddharth Pandey
Jun 23, 2009·Journal of Colloid and Interface Science·Sylvain Prévost, Michael Gradzielski
Jul 6, 2010·Journal of Hazardous Materials·Ke LuZhao-Liang Wu
Mar 1, 2012·Langmuir : the ACS Journal of Surfaces and Colloids·R PetkovaN D Denkov
Aug 31, 2017·Journal of Chromatography. a·Dhweeja Dasarathy, Yoichiro Ito
Jan 15, 2019·Journal of Hazardous Materials·Rajesh GhoshS Pushpavanam
Apr 11, 2019·Journal of Separation Science·Shayan SadeghYoichiro Ito

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