Solubilization of Organic Dyes in Surfactant Micelles Master of Science Thesis in the Master Degree Programme Materials and Nanotechnology
نویسنده
چکیده
In this study, the solubilization of two organic dyes, Sudan I (1-Phenylazo-2-naphtol) and Quinizarin (1,4-Dihydroxyanthraquinone), was studied in the presence of different types of surfactants (2 polymerics, 2 nonionics, 2 anionic, and one cationic) using UV-Vis spectroscopy. The effects of temperature, pH and addition of different electrolytes (NaCl, Na2CO3, NaI, NaOH, NaSCN) on dye solubilization were investigated mainly for Berol 535 (C11EO5), DTAB (C12 quaternary ammonium bromide) and SDS (C12 sodium sulphate). The effect of mixed micelles of different surfactants (DTAB:Berol 535 and SDS:Berol 535) on dye solubilization at different concentrations of NaCl was also studied. No synergy effect was observed for the solubilization of dyes in the binary mixture of surfactant micelles. The results showed that the solubilization of both dyes in the surfactant micelles increased with the temperature and addition of salt. However, the anionic surfactant (SDS) precipitated in the solution at high salt concentration (>20 g/l) and room temperature due to its high Krafft point and this had an adverse effect on dye solubilization. This was overcome by adding a nonionic surfactant to the solution or increasing the temperature. The absorbance spectrum of both dyes in surfactant micelles was similar to that obtained in ethanol and water/ethanol. This suggested that both dyes are located in rather polar region of the micelles (palisade region) and close to the surfactants head groups.
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