关键词: 电化学染色, 还原橄榄T, 间接电化学还原

Abstract: Commonly, in textile industry, addition of strong reducing agents is necessary to form the reduced dyestuff which is soluble in alkaline aqueous medium. The method produces heavy environmental pollution and economic burden, because reducing agents cannot be recycled and the disposal of dyeing bath and rinsing water cause high costs. Electrochemical reduction has the features of high security, low cost and less environmental problems, making it a promising alterative to chemical reduction of vat dyes. Therefore, it becomes a research hotspot nowadays. In this study, the electrochemical reduction of Vat Olive T was investigated in a Fe-TEA system by cyclic voltammetry (CV) and electrolytic experiments. Fe(III)-TEA complexes have good electrochemical activity in alkaline solution, which are well suited for the indirect electrochemical reduction of Vat Olive T and can avoid over-reduction of Vat Olive T. Furthermore, the effects of operating parameters including reaction current density, temperature, concentration of NaOH and Fe(III)-TEA mediator had been studied by L9(34) orthogonal experiments. The results show that high current efficiency (59.09%) can be successfully achieved under optimized conditions and the current density is found to be the main influence factor.

Key words: electrochemical dyeing, vat olive T, indirect electrochemical reduction