Abstract
The influence of two kinds of cationic surfactants on spectral properties of methyl orange in aqueous solutions has been investigated by means of UV-vis spectroscopy in various pH values and concentration range. For the Gemini14-methyl orange (MO) solutions, a hyperchromic shift was observed from 509-403 nm with the decrease of spectra absorption by increasing the pH values. Spectral behaviour of dye-surfactant solutions with varying concentrations of surfactants confirmed that electrostatic hydrophobic interactions between dye and surfactant played an important role. An H-type aggregation appeared in the concentration ratio 1:2 for Gemini14 and methyl orange, but in the CTAB solutions, the ratio was 1:1. The initial decrease of the absorbance resulted from dye-surfactant complex formation. It can be concluded that the amount of the cationic groups plays an important role in the complex formation.
| Original language | English |
|---|---|
| Pages (from-to) | 729-732 |
| Number of pages | 4 |
| Journal | Asian Journal of Chemistry |
| Volume | 23 |
| Issue number | 2 |
| State | Published - 2011 |
Keywords
- Absorption spectroscopy
- Dye-surfactant interaction
- Gemini surfactant
- Methyl orange