Study on the interaction of anionic dye–nonionic surfactants in a mixture of anionic and nonionic surfactants by absorption spectroscopy

摘要: Abstract The interaction between an anionic dye C.I. Reactive Orange 16 (RO16) and different surfactants, i.e., the surfactant sodium dodecylsulfate (SDS) nonionic surfactants polyoxyethylene ethers (CmPOEn; m = 12, 18, n = 4, 10 23) has been researched spectrophotometrically in a certain micellar concentration range. Light absorbances visible spectral range are measured as function of mole fraction at four temperatures 24 h over periodic time intervals. For this reason, typical system occurred 1.0 × 10−2 mol/l for 1.0 × 10−4 mol/l concentrations. It is evident from experimental measurements that while form complex with RO16 aqueous solution studied range, does not. formation CmPOEn–RO16 SDS solutions fractions its determined compared to those obtained dye–surfactant binary mixtures. Spectrophotometric indicated value absorbance SDS–RO16 greater than surfactant–RO16 systems. This state explains ionic hydrophobic interactions less interactions. addition mixture causes increase absorbance. due changed hydrophobic–hydrophilic balance Furthermore, we observed alkyl chain length number do not have enormous effect on values