草酸盐在高锰酸盐氧化 4-氯苯酚中的作用。
Role of oxalate in permanganate oxidation of 4-chlorophenol.
机构信息
Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes of Ministry of Education, College of Environment, Hohai University, Nanjing, 210098, PR China; State Environmental Protection Key Laboratory of Monitoring and Analysis for Organic Pollutants in Surface Water, Environment Monitoring Center of Jiangsu Province, Nanjing, 210036, PR China.
Key Laboratory of the Three Gorges Reservoir Region's Eco-Environment, Ministry of Education, School of Urban Construction and Environmental Engineering, Chongqing University, Chongqing, 400045, PR China.
出版信息
Chemosphere. 2018 Jul;203:117-122. doi: 10.1016/j.chemosphere.2018.03.119. Epub 2018 Mar 20.
The role of oxalate in 4-chlorophenol (4-CP) oxidation by permanganate (Mn(VII)) was explored in this study. The performance of oxalate was heavily depended on pH and oxalate concentration. 4-CP degradation by Mn(VII) was significantly enhanced at pH 4.0-6.0 in the presence of oxalate, while negligible influence was observed at pH 7.0-9.0. The oxalate plays a dual role in Mn(VII) oxidation over the pH range of 4.0-6.0: one is the chelate, which coordinates with Mn(III) to form Mn(III)-oxalate complexes, and the other is the reductant, which reacts with Mn(III) to form Mn(II). The stable Mn(III)-oxalate complexes can work as an efficient oxidant for 4-CP. While their unstable counterparts, due to the lower concentration of oxalate or the higher pH, would auto-decomposed to MnO and Mn(II), and then the MnO works as both a catalyst and an oxidant for the decomposition of 4-CP.
本研究探讨了草酸盐在高锰酸盐（Mn(VII)）氧化 4-氯苯酚（4-CP）中的作用。草酸盐的性能严重依赖于 pH 值和草酸盐浓度。在 pH 值为 4.0-6.0 且存在草酸盐的条件下，Mn(VII) 对 4-CP 的降解作用显著增强，而在 pH 值为 7.0-9.0 时几乎没有影响。在 pH 值为 4.0-6.0 的范围内，草酸盐在 Mn(VII)氧化中起着双重作用：一种是螯合剂，与 Mn(III)配位形成 Mn(III)-草酸盐配合物，另一种是还原剂，与 Mn(III)反应形成 Mn(II)。稳定的 Mn(III)-草酸盐配合物可用作 4-CP 的有效氧化剂。而由于草酸盐浓度较低或 pH 值较高，它们不稳定的对应物会自动分解为 MnO 和 Mn(II)，然后 MnO 既作为催化剂又作为氧化剂，促进 4-CP 的分解。
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