We did this study to use two different types of geopolymers based on metakaolin or metakaolin combined with slag to decolorize the colour from the dyeing bath leftovers from the liquid waste of reactive red dye 195 in an effort to reduce pollution and protect the environment. The findings demonstrated that this technique offered colour reduction as a low-cost and affordable option.

In the light of our strategy based on reducing pollution and protecting the environment, and as a continuation of our previous work, we conducted this study to remove the color from the residues of the dyeing bath from the liquid waste of Reactive Red 195 using two different types of geopolymers based on metakaolin -slag mixtures in a ratio of 4 : 1 and 3 : 2. The results showed that this method gave environmental safety and colour reduction.