Reducing substances-enhanced degradation of pollutants by permanganate: The role of in situ formed colloidal MnO 2

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 MnO was formed through the reduction of permanganate by aniline and contributed to BPA oxidation considerably. The reactivity of MnO is sensitive to pH and is high under acidic conditions, resulting in the observed enhancement of aniline on BPA removal by permanganate at pH