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On the other hand, nitrobenzene was mainly decomposed by direct UV photolysis because Br2˙- does not react with nitrobenzene. The contribution of hydroxyl radical (HO˙) to 1,4-dioxane degradation was much lower than that of Br2˙- because its concentration was 4-5 order of magnitude lower than that of Br2˙-. However, the HO˙ concentration elevated with a decrease in the concentration of bromide ion (Br-). Consequently, the reactivity of Br2˙- with pollutants and the Br- concentration have critical impacts on the advanced oxidation