Skip to Main Content
The effect of iron addition in the treated solution on the decomposition of indigo carmine is reported. The effect of iron addition was evaluated for various Fe2+ concentrations ranging from 0 to 118 μmol/L (μM). The decolorization rate and efficiency with Fe2+ addition were higher than those without Fe2+ and increased with the rise in Fe2+ concentrations. The optimal Fe2+ concentrations for decolorization rate and efficiency were 95 and 83 μM, respectively. The pH effect was evaluated in the range of 2.3-11.3 values for the initial solution containing 71 μM Fe2+. The decolorization rate was approximately constant for pH ranging from 4.7 to 8.0. The increases in decolorization rate and efficiency with Fe2+ are attributed to a significant increase in hydroxyl radicals quantity, which is generated by Fenton's reaction of iron and hydrogen peroxide.
Date of Publication: Dec. 2012