Sanromán M A, Pazos M, Ricart M T, Cameselle C
Department of Chemical Engineering, University of Vigo, Lagoas-Marcosende s/n, Vigo 36200, Spain.
Chemosphere. 2004 Oct;57(3):233-9. doi: 10.1016/j.chemosphere.2004.06.019.
The electrochemical decolourisation of structurally different dyes (bromophenol blue, indigo, poly R-478, phenol red, methyl orange, fuchsin, methyl green and crystal violet) by means of the application of DC electric current was assessed. It was found that the electrochemical process allowed a colour removal of all dyes studied, although the decolourisation rate largely depended on the chemical structure of the different dyes. Nearly complete decolourisation was achieved for bromophenol blue followed by methyl orange and methyl green, whereas phenol red was hardly decolourised (30% in 60 min). In mixtures of two dyes, the decolourisation rate became similar for both dyes. However, the addition of a redox mediator, (Co(2+/3+)) clearly enhanced the degradation rate of all tested dyes, but the simplest dye molecules were attacked firstly, followed by dyes with more complex chemical structures. The results revealed the suitability of the process to effectively decolourise wastewaters from dyeing process.
通过施加直流电流评估了结构不同的染料（溴酚蓝、靛蓝、聚R - 478、酚红、甲基橙、品红、甲基绿和结晶紫）的电化学脱色情况。结果发现，电化学过程能够去除所有研究的染料的颜色，尽管脱色率在很大程度上取决于不同染料的化学结构。溴酚蓝几乎完全脱色，其次是甲基橙和甲基绿，而酚红几乎未被脱色（60分钟内为30%）。在两种染料的混合物中，两种染料的脱色率变得相似。然而，添加氧化还原介质（Co(2 + / 3 +)）明显提高了所有测试染料的降解率，但最简单的染料分子首先受到攻击，其次是化学结构更复杂的染料。结果表明该过程适用于有效脱色染色过程产生的废水。
