Comparative Study of Exhaustion and Fixation Behavior of Mono-Functional and Bi-Functional Reactive Dye on Cotton Knitted FabricDownload PDF
Reactive dyes are the most common dyes utilized in the dyeing of cotton; these still cause significant environment concerns for the textile industry. Waste water treatment of pollutants from dyeing is difficult to conduct economically. One method to reduce residual color in wastewater is to increase exhaustion and fixation values of dyes. Increasing the exhaustion and fixation not only decrease the level of color in the effluent but the application will require lower levels of electrolytes, with an associate reduction of aquatic toxicity of effluent. In this study, the exhaustion of the two structural of reactive dyes was used one is mono-functional and another is bi-functional. It is supposed to find the effect of functional groups on exhaustion and fixation behavior of reactive dyes on cotton substrate in terms of physical and chemical analysis. It has been assessed using Isothermal dyeing experiments. Isothermal exhaustion experiments were conducted on the two dye types at same temperatures and electrolyte concentration. Bi-functional dyes (DCT, VS) had a greater exhaustion on cotton than the corresponding mono-functional dyes (VS). Laboratory dyeing experiments were conducted on the commercial mono-functional and bi-functional dyes. These experiments included an assessment of the effects of time. The fixation of yellow dye is higher than red dye. Exhaustion and fixation behavior of mono-functional reactive dye is lower than bi-functional reactive dye for yellow colorant. But only fixation behavior of yellow dye is lower than red dye.
Keywords: Exhaustion, Fixation, Mono-functional, Bi-functional, K/S value etc.