Anthraquinones as mediators for the indirect cathodic reduction of dispersed organic dyestuffs

被引:53
作者
Bechtold, T [1 ]
Burtscher, E [1 ]
Turcanu, A [1 ]
机构
[1] Univ Innsbruck, Inst Text Chem & Text Phys, A-6850 Dornbirn, Austria
基金
奥地利科学基金会;
关键词
cyclic voltammetry; spectroelectrochemistry; anthraquinones; vat dyes; indirect reduction;
D O I
10.1016/S0022-0728(99)00057-1
中图分类号
O65 [分析化学];
学科分类号
070302 ; 081704 ;
摘要
9,10-Anthraquinone-2-sulfonic acid Na-salt (AQS2), 9,10-anthraquinone-1,5-disulfonic Na-salt (AQDS1,5) and 1,4-dihydroxy-9,10-anthraquinone (DHAQ1,4) were investigated as to their ability to act as mediators for indirect electrochemical reduction of dispersed organic dyestuffs. A characterisation of the reducing efficiency was obtained from CV-experiments when comparing the cathodic current maxima of the AQ solution containing the dyestuff with the cathodic peak current without reducible vat dye. Voltammograms in a flow cell show that the limiting current density is dependent mainly on the diffusion transport of the AQ, while the addition of reducible dispersed dyestuff is of minor influence. Spectroelectrochemical experiments performed with 9,10-anthraquinone-1,5-disulfonic Na-salt in presence of Vat Yellow 1 permit a photometric observation of the coupled redox reactions. (C) 1999 Elsevier Science S.A. All rights reserved.
引用
收藏
页码:80 / 87
页数:8
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