Decoloration of dyes such as methylene blue and tartrazine solutions is investigated by subjecting dye solution to electrogenerated oxygen or chlorine species in electrolytes at a Pt anode. Decoloration is weak in the presence of electrogenerated oxygen species but increases in the KCl electrolyte. Decoloration in this solution is accomplished by the electrogenerated hypochlorite ion. Also, when placed in contact with a Pt anode, cotton fabric dyed with reactive dyes is decolorized significantly after short-term electrolysis in an electrolyte containing KCl, but decoloration of dyed fabrics is very weak in an electrolyte that is free from KCl.
Get full access to this article
View all access options for this article.
References
1.
Chen, C.C., and Rajeshwar, K., ChemicalAttack on Polypyrrole by Electrolytically Generated Solution Species in Aqueous Chloride Medium , J. Electrochem. Soc.141, 2942-2946 (1994 ).
2.
Dannacher, J. , and Schlenker, W., Was ist Aktivsauerstoff? Der Mechanismus der Wasserstoffperoxide-Bleiche in Waschprozess, Textilveredlung25, 205-207 (1990).
3.
Fukatsu, K., and Kokot, S., Effects of Halogen Ions on Degradation of Azo Dyes with Electrolysis , Sen-i Gakkaishi53, 15-19 (1997).
4.
Gregory, P., and Stead, C.V., The Degradation of Watersoluble Azo Compounds by Dilute Sodium Hypochlorite Solution, J. Soc Dyers Colour.94, 402-407 (1978).
5.
Karunditu, A.W. , Carr, C.M., and Dodd, K., Activated Hydrogen Peroxide Bleaching of Wool, Textile Res. J.64, 570-572 (1994).
6.
Kokot, S., Marahusin, L., Schweinsberg, D.P., and Jermini, M., Characterizing Oxidatively Damaged Cotton Fabrics, Part II: A Model of the Catalytic Damage Phenomenon Using Electrogenerated Oxygen, Textile Res. J.64, 710-716 (1994).
7.
Kokot, S., Marahusin, S., and Schweinsberg, P. , A Morphological Study of Cotton Fabric Damage by ElectroGenerated Oxygen, Textile Res. J.63, 313-319 (1993).
8.
Lassali, T.A.F. , Boodts, J.F.C., and Trasatti , S., Electrocatalytic Activity of the Ternary Oxide Ru0.3PtxTi(0.7-X) O 2 for Chlorine Evolution, Electrochim. Acta39, 1545-1549 (1994).
9.
Marahusin, L. , Kokot, S., and Schweinsberg , D.P., TheDegradation of Cotton Fabric by Electro-Generated Oxygen: Polarization Behaviour at the Pt Anode, CorrosionSci.33, 1281-1293 (1992 ).
10.
Marahusin, L., Kokot, S., and Schweinsberg , D.P., Electrogeneration of Oxygen at Copper and Iron Electrodes and Its Interaction with Cotton Fabric, CorrosionSci.34, 1007-1016 (1992 ).
11.
Meyer, U., Kokot, S., Weber, R., and Ziircher, J., Wie entstehen Katalytschäden? Versuche zur Aufklärung des Entstehungsmechanismus , Textilveredlung22, 185-190 ( 1987).
12.
Nippon Kagakukai, "Kagaku Benran" (Handbook of Chemistry), Maruzen , Tokyo, 1993, pp. 1316-1317.
13.
Ohura, R., Katayama, A., and Takagishi, T., Degradation of Sulfonated Azo Dyes with Sodium Percarbonate; Textile Res. J.62, 552-556 (1992).
14.
Olsen, E.S., "Textile Wet Processes: Volume 1, Preparation of Fibers and Fabrics ," Noyes Publications, NJ, 1983, pp. 127-151.
15.
Schweinsberg, D.P., Marahusin, L., and Kokot, S., Alkaline Oxidation of Copper in the Presence of a Natural Polymer, Ed. Rev. Metallurg.6, 89-95 (1993).
16.
Smith, P.W.G. , and Tatchell, A.R., "Organic Chemistry for General Degree Students: Volume I Fundamental Aliphatic Chemistry," Pergamon Press , Oxford, U.K., 1965 , p. 120.
17.
Taher, A.M.M. , and Cates, D.M., Bleaching Cellulose, Part I: A Free Radical Mechanism, Textile Chem. Colour.7, 220-224 (1975).
18.
Thompson, K.M. , Griffith, W.P., and Spiro, M., Mechanism of Peroxide Bleaching at High pH , J. Chem. Soc. Chem. Commum. (21), 1600-1601 (1992).
19.
Turnbull, B.W. , An Alternative to the ASTM G5 Standard Electrochemical Cell, in "Proc. Pacific Corrosion '87," vol. 1, A. C. A. Inc., Melbourne, Australia, 1987.
