Quantitative measurement techniques for binary dyemixtures: a case study in an adsorption system

摘要

Three binary dye mixtures prepared from the basic textile dyes Astrazon Blue FGRL (AB), Astrazon RedGTLN (AR), and Astrazon Golden Yellow GL-E (AY), were employed to demonstrate two different mixture characteristics.The first type of mixture (AB + AY) was the case where the optical absorbance spectra of the dye mixtures exhibited doublepeaks. Each peak occurred at the same wavelength as the single dye and the area under each light absorbance curve variedwith the concentration of the dye in the solution. The second type was the case of the other two mixture combinations(AR + AY and AB + AR) whose spectra exhibited a single peak. In this case, shifts of the spectral peaks were observed asthe composition of the mixture changed, and the area beneath the light absorbance curve corresponded to the quantity ofthe dyes in the mixture. With these techniques, it was possible to determine the quantity of each individual dye componentin the binary dye mixture. The application of these techniques was demonstrated through estimation of the amount of dyeadsorbed from simulated dye wastewater by dried biomass of Caulerpa lentillifera.