Dyeing of Modified Cotton Fiber with Natural Terminalia arjuna Dye: Optimization of Dyeing Parameters Using Response Surface Methodology

The study demonstrated that the natural yellow-brown colorant extracted from the bark of Terminalia arjuna may be an alternative, sources of synthetic dyes for the potential dyeing of double premordanted cotton fiber. Parameters that influence the dye uptake as well as surface color strength of dyed cotton were studied in batch experiments and optimized by using response surface methodology. The results showed that the maximum color strength of dyed cotton was achieved to be 17.2060.11 under the optimum conditions of mordant concentration (3.75% owf), dye concentration (8.9%), pH of the dye bath (8.7), temperature (69.34 degrees C),and time (82.17 min), respectively. The CIELab values in the color space diagram showed a good improvement of color quality of natural polymers treated by tannic acid-alum mordant. Fourier Transforms Infrared spectra and Scanning Electron Microscope observation have been used to characterize the changes induced by arjun dyeing. Good and durable fastness properties confirm its application in the textile industries. (C) 2016 American Institute of Chemical Engineers Environ Prog, 35: 719-728, 2016