Abstract
Permanganate is one of common oxidants used for organic pollutant abatement in water treatment. This study showed that the degradation rate of bisphenol A (BPA) by permanganate at pH 5.0 in the presence of aniline is much higher than that in the absence of aniline. 2, 5, and 10 μM of aniline enhanced BPA degradation rate by 104%, 326% and 601%, respectively. Colloidal MnO2 was formed through the reduction of permanganate by aniline and contributed to BPA oxidation considerably. The reactivity of MnO2 is sensitive to pH and is high under acidic conditions, resulting in the observed enhancement of aniline on BPA removal by permanganate at pH < 7.0. The role of MnO2 was further confirmed by the relationship of MnO2 formation and BPA/aniline removal, the inhibitory effect of Ca2+ on the oxidation of BPA in the presence of aniline. Besides the aniline/BPA system, the pollutants which react with permanganate rapidly are likely to enhance the degradation of coexisting pollutants which show high reactivity towards MnO2. Due to the reduction of permanganate and stabilization of the in situ formed colloidal MnO2 by water matrix, the oxidation rate of pollutant in real water is higher than that in pure water.
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