Reuse of recovered dyes in cyclodextrins in dyeing process

The purpose of the paper is to describe the possibility of reuse of encapsulated textile dyes into the structural cavity of CDs for a new dyeing process. The dyes to be reused represent the unfixed dyes that remain in the textile waste water after the dyeing process. Three types of cyclodextrins were tested individually with each dye and the best results were tested in a tricomy using the CDs with a larger cavity, the CDs. The complexes formed between the dyes and CDs were proved by FTIR analysis, and the fabrics were characterized by spectrophotometric and by CIELab coordinates in order to determine their differences. It has been demonstrated that direct dyes form inclusion complexes with the CDs. It can be affirmed that the cyclodextrins are capable of encapsulating a tricomy mix wastewater successfully. Regarding the dyeing process, it was observed that the colour of the dyed fabrics presents just a minor difference compared with the original dye without the involvement of the cyclodextrins technique, making it viable.