The oxidation of thallium(I) (Tl (Ⅰ)) to Tl (ⅠII) is referred to as an efficient means for Tl removal. Bromide (Br¯) inevitably occurs in nearly all water sources at concentrations of 0.01–67 mg/L (0.14–960 μM). The effect of Br¯ remains largely unclear but likely of critical importance on the redox fate and thus the removal potential of Tl (Ⅰ) during typical oxidation treatment processes. Here, we investigate the kinetics and tackle the mechanism of Tl (Ⅰ) oxidation by permanganate (KMnO₄) under the influence of Br¯. The results demonstrated that Br¯ at environmental levels exhibited significant catalytic effect on Tl (Ⅰ) oxidation kinetics by KMnO₄ at acidic pH of 4.0–7.0, while no significant effect of Br¯ was observed for Tl(I) oxidation under alkaline conditions of pH 8.0 and 9.0. It was found that the enhanced oxidation kinetics under acidic conditions was driven by the combined effect of and autocatalysis mediated by MnO₂ and a fast oxidation kinetics served by in-situ formed bromine species. Through quantifying the relative contributions of those bromine species to the homogenous oxidation of Tl(I), HOBr, Br₂ and Br₂O were found to play roles in catalyzing the oxidation of Tl(I) by KMnO₄. The results discussed herein highlight the critical role of Br¯ on the Tl(I) complex oxidation process by KMnO₄ and may have implications for evaluating the redox cycle and removal potential of Tl in bromide-containing water treatment.

铊（I）（Tl（Ⅰ））氧化成Tl（ⅠII）被认为是去除Tl的有效手段。溴化物 (Br¯) 不可避免地存在于几乎所有水源中，浓度为 0.01–67 mg/L (0.14–960 μM)。在典型的氧化处理过程中，Br¯ 的影响在很大程度上仍不清楚，但可能对氧化还原命运和 Tl (Ⅰ) 的去除潜力至关重要。在这里，我们研究了在Br¯的影响下高锰酸盐（KMnO ₄ ）氧化Tl（Ⅰ）的动力学并解决了机理。结果表明，环境水平的Br对KMnO _{4对Tl(Ⅰ)的氧化动力学具有显着的催化作用。}在 4.0-7.0 的酸性 pH 值下，在 pH 值 8.0 和 9.0 的碱性条件下，没有观察到 Br¯ 对 Tl(I) 氧化的显着影响。发现酸性条件下增强的氧化动力学是由 MnO ₂介导的自催化和原位形成的溴物质所提供的快速氧化动力学共同作用驱动的。通过量化这些溴物种对 Tl(I) 均相氧化的相对贡献，发现 HOBr、Br ₂和 Br ₂ O 在催化 KMnO ₄氧化 Tl(I) 中发挥作用。本文讨论的结果突出了 Br¯ 在 KMnO _{4的 Tl(I) 复合氧化过程中的关键作用}并且可能对评估含溴化物水处理中 Tl 的氧化还原循环和去除潜力有影响。