Shandong Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science & Engineering, Shandong University, Qingdao, 266237, PR China.
College of Environment & Ecology, Chongqing University, Chongqing, 400044, PR China.
Chemosphere. 2021 Aug;276:130203. doi: 10.1016/j.chemosphere.2021.130203. Epub 2021 Mar 8.
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 < 7.0. The role of MnO was further confirmed by the relationship of MnO formation and BPA/aniline removal, the inhibitory effect of Ca 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 MnO. Due to the reduction of permanganate and stabilization of the in situ formed colloidal MnO by water matrix, the oxidation rate of pollutant in real water is higher than that in pure water.
高锰酸盐是水处理中用于去除有机污染物的常用氧化剂之一。本研究表明，在 pH 值为 5.0 的条件下，苯胺的存在会大大提高高锰酸盐对双酚 A（BPA）的降解速率。2、5 和 10 μM 的苯胺分别将 BPA 的降解速率提高了 104%、326%和 601%。苯胺还原高锰酸盐会形成胶体 MnO，并对 BPA 的氧化起到重要作用。MnO 的反应活性对 pH 值敏感，在酸性条件下活性较高，这导致在 pH 值 < 7.0 的条件下，观察到高锰酸盐对 BPA 的去除因苯胺的存在而增强。MnO 的作用还通过 MnO 的形成与 BPA/苯胺去除之间的关系以及 Ca 对存在苯胺时 BPA 氧化的抑制作用得到进一步证实。除了苯胺/BPA 体系之外，那些与高锰酸盐快速反应的污染物很可能会增强对 MnO 具有高反应活性的共存污染物的降解。由于水基质还原高锰酸盐并稳定原位形成的胶体 MnO，实际水中污染物的氧化速率高于纯水。
