Removal of hydrolized reactive dyes from cotton fabric after dyeing

Removal of hydrolysed reactive dye is an important stage in cotton dyeing as it aff ects the exploitation and hygienic properties of textile products. As a major consumer of water and chemicals, this work process is being studied from the point of view of saving natural resources and environmental protection. In this paper, studied was the eff ect of washing agents on the basis of surfactants with diff erent ionogenicity as well as pure water on the removal of hydrolyzed reactive dyes having diff erent functional groups. The obtained results suggest that clean water with a larger bath ratio (1:30) and a washing time of 30 min can be an eff ective remover for hydrolysed monoreactive dye. In the removal of the hydrolysed bifunctional dye, beside the bath ratio and washing times, the concentration of surfactants can also have a signifi cant eff ect on the process effi ciency.