还原蓝RSN的直接电化学还原

Direct electrochemical reduction of Vat Blue RSN

直接电化学还原过程中,染料和电极接触不良导致电化学还原效率低。采用三维多孔的石墨毡电极作为工作电极,在不添加任何媒介及保险粉的条件下对还原蓝RSN进行直接电化学还原研究。探讨还原蓝RSN直接电化学的还原历程,以及温度、电流和碱浓度对电化学还原的影响。结果表明,还原蓝RSN在石墨毡电极上可发生两步还原反应,需在合适的电压、温度及碱浓度下进行,否则会过还原或还原不充分。

The poor contact between vat dye and electrodes and the low efficiency of direct electrochemical reduction were the main problems that hinder the development of direct electrochemical reduction of vat dye.A three-dimensional porous carbon felt electrode was used as the working electrode,and the direct electrochemical reduction of Vat Blue RSN was carried out without adding mediums and sodium dithionite.The direct electrochemical reduction mechanism and the influences of reduction temperature,current and alkali concentration on electrochemical reduction were studied.The results showed that the direct electrochemical reduction of Vat Blue RSN on graphite felt electrode could take place in two steps.The reduction process needed to be under the conditions of appropriate voltage,temperature and alkali concentration,otherwise the dye would be over-reduced or insufficiently reduced.