- 作者: Mostafa, O.I. ; Abd El-Aal, A.Y. ; El Bayaa, A.A. et al.
- 作者服務機構: Chemistry Dept., Faculty of Science, Al-Azhar Univ., Nasr City, Cairo, Egypt
- 中文摘要:
The absorption spectra of aqueous solutions of monochlorotriazine reactive dyes, C.I. Reactive Red 9 and Reactive Orange 13 were measured in the presence of 5, 10, 25 and 50% (v/v) of ethanol, pyridine and dioxane-water mixtures and in varied concentrations of KCl, NaCl and LiCl. The varying position, intensity and shape of absorption bands are interpreted in terms of aggregation and disaggregation of dyes in solutions. The aggregation behaviour of the reactive dyes in solutions and in the presence of additives is related to their apparent deviations from Beer's law and aggregation numbers (N). The aggregation constant (K) of the monomer/dimer equilibrium is calculated.
Dyes in ethanol-water mixtures record a larger aggregation number and aggregation constant than in the presence of pyridine. Dioxane is classified as a non-polar solvent and hence has a more disaggregating influence. The value of the aggregation number and constant are increased with increasing salt concentration and the order of degree of aggregation is KCl>NaCl>LiCl related to the order of ionic radii of K/sup +/, Na/sup +/ and Li/sup +/ ions. - 英文摘要: --
- 中文關鍵字: Aggregation; Reactive Dye; Aggregation Constant; Solvent Effect; Salt Effect
- 英文關鍵字: 凝集;反應性染料;凝集常數;溶劑效應;鹽類效應