Interaction of anionic azo dye and TTAB: cationic surfactant

Journal of the Brazilian Chemical Society

Sayed Mehdi Ghoreishi¹  Mohsen Behpour¹  Mehdi Shabani-nooshabadi¹ 

[1] ,University of Kashan Faculty of Science Department of ChemistryKashan,Iran

关键词: ion selective electrode;    anionic azo dye;    dye-surfactant interactions;    TTAB;    Acid Red 14;    Acid Red 1;    Acid Orange 7;   

DOI  :  10.1590/S0103-50532009000300008

来源: SciELO

【 摘 要 】

Interaction between three anionic azo dyes, C.I. Acid Red 14 (AR14), C.I. Acid Red 1 (AR1), C.I. Acid Orange 7 (AO7) and a cationic surfactant tetradecyltrimethylammonium bromide (TTAB) has been investigated using surfactant selective electrode technique. The TTAB selective electrode was constructed and used to determine the concentration of TTAB monomers and also surfactant ions bounded to dyes by electromotive force data. The dye-surfactant complex formation constant, K1, and the standard free energy change, ΔG1º, could be obtained from the experimental data. The results indicate that in the TTAB/AO7 system, where the more hydrophobic dye AO7 is used, the dye-surfactant interactions are stronger than in other systems. The results also indicate that both the electrostatic attractive and the hydrophobic interactions are very important for the formation of the complex between the oppositely-charged dyes and the surfactant. Maximum binding capacities of the dyes and also the degree of binding of the surfactant to the dyes were calculated from the experimental data.

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