Grupo de electroquímica, Instituto de química, Facultad de ciencias exactas y naturales, Universidad de Antioquia, A.A. 1226 Medellín, Colombia.
J Hazard Mater. 2010 Jul 15;179(1-3):120-6. doi: 10.1016/j.jhazmat.2010.02.067. Epub 2010 Mar 1.
An experimental design methodology was applied to evaluate the decolourization of crystal violet (CV) dye by electrocoagulation using iron or aluminium electrodes. The effects and interactions of four parameters, initial pH (3-9), current density (6-28 A m(-2)), substrate concentration (50-200 mg L(-1)) and supporting electrolyte concentration (284-1420 mg L(-1) of Na(2)SO(4)), were optimized and evaluated. Although the results using iron anodes were better than for aluminium, the effects and interactions of the studied parameters were quite similar. With a confidence level of 95%, initial pH and supporting electrolyte concentration showed limited effects on the removal rate of CV, whereas current density, pollutant concentration and the interaction of both were significant. Reduced models taking into account significant variables and interactions between variables have shown good correlations with the experimental results. Under optimal conditions, almost complete removal of CV and chemical oxygen demand were obtained after electrocoagulation for 5 and 30 min, using iron and aluminium electrodes, respectively. These results indicate that electrocoagulation with iron anodes is a rapid, economical and effective alternative to the complete removal of CV in waters. Evolutions of pH and residual iron or aluminium concentrations in solution are also discussed.
采用实验设计方法评估了铁或铝电极的电化学混凝法对结晶紫（CV）染料的脱色效果。优化和评价了初始 pH 值（3-9）、电流密度（6-28 A m(-2)）、底物浓度（50-200 mg L(-1)）和支持电解质浓度（284-1420 mg L(-1)的 Na(2)SO(4)）这四个参数的影响和相互作用。尽管使用铁阳极的效果优于使用铝阳极，但研究参数的影响和相互作用非常相似。置信水平为 95%时，初始 pH 值和支持电解质浓度对 CV 的去除率影响有限，而电流密度、污染物浓度以及两者之间的相互作用则是显著的。考虑到显著变量和变量之间相互作用的简化模型与实验结果具有良好的相关性。在最佳条件下，使用铁和铝电极进行电化学混凝 5 和 30 min 后，CV 和化学需氧量几乎可以完全去除。这些结果表明，铁阳极电化学混凝法是一种快速、经济且有效的方法，可用于去除水中的 CV。还讨论了 pH 值和溶液中残留铁或铝浓度的演变。
