Direct current electrocoagulation of azo-2-naphthol dye using aluminiumelectrodes: Effect of metal ion on dye colour removal

A solution of azo-2-naphthol dye containing a metal ion was subjected to direct current electrocoagulation (DCE). Different initial dye concentration in the range 0.01-1.0 % (w/v) was investigated with different metal ions including Fe2+, Fe3+ and Cu2+. The results obtained showed significant complexation of the metal ions with dye