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Chapter 6 • Dyes and their removal technologies from wastewater 129 Table 1 Classification of dyes based on their usage [14-17]. Class of dye Chromophoric group present Applied on substrate Method of application Direct Stilbene, phthalocyanine, azo, oxazine, and polyazo Silk, cotton, paper, nylon, rayon and leather In the midst of dye baths containing slightly alkaline or neutral conditions along with additional electrolyte Basic Diazahemicyanine, azine, oxazine diphenylmethane, anthraquinone, azo, thiazine, xanthine triarylmethane, cyanine, hemicyanine, and acridine Modified nylon, inks, medicine, paper, tannin mordanted cotton, modified wool, polyacrylonitrile, polyester, silk, polyester, and medicine Dye baths amidst acidic environments Vat Indigoids and anthraquinone (including polycyclic quinines) Rayon, wool, cotton, polyestercotton, and cellulosic fibers, Dyes insoluble in aqueous media are solubilized on reduction with NaHSO 3 , after which exhausted on fiber, finally reoxidized Fiber reactive/ reactive Azo, phthalocyanine, basic, anthraquinone, oxazine, triphenylmethane, and formazan Silk, cotton, cellulosic, nylon, and wool Interaction between active site of dye with func

Author

Mouni Roy; Rajnarayan Saha

Publisher

Elsevier

Published

2021

Language

EN