Green dyeing process optimization of fibres using protic ionic liquids

Safira Moura Barros, Miguel Iglesias

Research output: Contribution to conferencePosterpeer-review


Textile dyeing industry is the most chemically intensive and the second polluter of clean water (after agriculture). Usually, it uses non-eco-friendly traditional processes, with large amounts of water and chemicals as additives, which can have a huge environmental impact and could be harmful to human health. Recently, papers have been published focusing in finding alternative sustainable process to reduce the amount of water and chemicals used, as well as improve the quality of the dyeing and keep the cost of the process low. Protic Ionic Liquids (PIL) come into the light as new versatile media for many chemical syntheses, enzymatic catalysis and green engineering processes. PILs are made up of a pair of positive and negative ions, but they are liquid at room temperature unlike conventional molten salts. Also, PILs have low cost, most of them are biodegradable and they mostly have simple synthesis. In this work, a reduced number of dyeing agents was used to optimize an alternative green procedure available in the open literature. Textile dyes, a cationizer pre-treatment fibre technique, and protic ionic liquids as additives in aqueous solution were analysed for the dyeing process of six different fabric types. The results with 30% m/m of PILs in aqueous solution shows colour strength up to 250 times higher than the alternative procedure available, and the cationization technique had a key role in colour fixation. In addition, cytotoxicology assays of the fabrics dyed in PILs aqueous solution were evaluated and they did not present any toxicology. Consequently, the alternative procedure proposed reduces its environmental impact, and on the other hand increased its dye quality, according to the dyeing agents results in terms of quality measurements such as absorption of colour and wash fastness standards of the dyed fibre. Moreover, this work innovates dyeing processing in using a reactive dye as an “universal dye”, aiming for a more sustainable and safe profile for the textile industry.
Original languageEnglish
Number of pages1
Publication statusPublished - 4 Jul 2022
EventRoyal Australian Chemical Institute National Congress 2022: Chemistry: Catalysing solutions to global challenges - Brisbane Exhibition & Convention Centre, Brisbane, Australia
Duration: 3 Jul 20228 Jul 2022


ConferenceRoyal Australian Chemical Institute National Congress 2022
Abbreviated titleRACI2022
Internet address

Bibliographical note

Poster presentation W-228 Wednesday 6 July 2022


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