[직/편성물 염색] Cathodic Reduction of CI Acid Red 27 and CI Reactive Black 5—Basic Investigations of Decoloration of Textile Waste Water 출판일 : 2001.10.01 저자 : T. Bechtold, E. Burtscher, A. Turcanu 서지사항 : Textile Research Journal, Volume 71, No 10 (2001), 870-878 페이지 등록일 : 2012.08.20 I 조회수 : 93 작성자 : admin |
Reductive decoloration of CI Acid Red 27 and CI Reactive Black 5 is achieved by cathodic
electron transfer. The stoichiometry of the dyestuff reduction is studied with redox titrations
using an Fe(II)-TEA complex as the reducing agent. CI Acid Red 27 is reduced to the
corresponding amines at room temperature, while full reduction of CI Reactive Black 5 is
observed first at elevated temperatures. In potentiostatic reduction experiments, CI Acid Red
27 is decolorized with an uptake of 4e-. CI Reactive Black 5 can be readily decolorized by
cathodic electron transfer. The reaction proceeds via relatively stable hydrazo
intermediates. Investigations with cyclic voltammetry and galvanostatic batch electrolysis
experiments indicate that the rate of decoloration with CI Reactive Black 5 depends
somewhat on transport processes in the diffusion layer of the cathode, but is limited by a
preceding chemical equilibrium.
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