Abstract
Nowadays, various physical and chemical methods have been presented by researchers around the World for discoloration of denim fabrics. Although they have their own advantages and disadvantages, some of them have been used in garment industry for many years. In the present study, indigo dyed denim was discolored with one of the most popular advanced oxidation procedures (AOP) using combination of H2O2/UV. We observed a very effective discoloration (ΔE* = 17.44 after 150 min UV exposure). UV–vis spectra showed the disappearance of absorption peaks of indigo due to decomposition of chromophores and aromatic rings. Based on the FTIR spectra from discolored denim, we concluded that photolysis reactions occurred on denim following by generation of OH and OOH radicals. Cotton fibers in discolored denim samples showed disorientation, wrinkling and defibrillation depending on UV exposure duration. Hence, H2O2/UV process could be recommended to as a simple and effective method for denim discoloration.
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