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Abstract
The effect of UV radiation on the removal of formic, oxalic and maleic acids from water by metallic ion (Fe2+ or Cu2+)/H2O2 and metallic ion/O3 was studied and compared. The results showed that metallic ion/O3/UV has higher efficiency than metallic ion/H2O2/UV for oxalic acid removal. UV radiation significantly increases the efficiency of metallic ion/H2O2 for formic and maleic acids removal while its effect on the efficiency of metallic ion/O3 for formic acid removal is minor. However, at pH 2, O3 alone showed higher efficiency than metallic ion/H2O2/UV for formic acid removal. Contrary to the relative efficiency of metallic ions in the previous systems, Cu2+ exhibited higher rate than Fe2+ for the removal of the degradation products of maleic acid by O3. UV radiation exhibited a minor effect on the efficiency of Cu2+/O3, while it exhibited a large effect on the efficiency of Fe2+/O3 for the removal of the degradation products of maleic acid.