Abstract
The discoloration of aqueous dye solutions induced by UV‐light in the presence of Fe(III) ion and humic acid (HA) were studied under the conditions typical for natural surface waters with high dissolved organic carbon (DOC) concentrations. The presence of Fe(III) and HA in the dye solutions significantly enhance the discoloration efficiency. The discoloration rate of dye solutions decreased with increasing pH values in the pH range studied (3–6), while it increased with increasing concentrations of Fe(III) over the range of 2.0 × 10‐5‐2.0 × 10‐4mol/L. The optimal concentration of HA under the examined condition was 0.5 mg/L. The initial concentration of dye solution also has some effects on the discoloration efficiency of dyes.
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