Bromide (Br^-), which is omnipresent in water bodies, can not only affect the degradation kinetics of target pollutants but may also form undesired byproducts (such as bromate (${\text{BrO}}_{\text{3}}^{\text{-}}$) and brominated disinfection byproducts (Br-DBPs)) through sulfate radical ($\text{S}{\text{O}}_{\text{4}}^{·\text{-}}$)-based advanced oxidation processes (AOPs). This study found that Br^- significantly suppressed the degradation of diethyl phthalate (DEP) based on the ultraviolet (UV)/persulfate (PS) treatment and was efficiently converted into reactive species (radicals and free bromine) by the $\text{S}{\text{O}}_{\text{4}}^{·\text{-}}$ or hydroxyl radical (HO^•) generated in the UV/PS system. These reactive bromine species could, in turn, brominate the phenolic degradation intermediates of DEP as well as natural organic matter (NOM), yielding Br-DBPs, including tribromomethane (TBM), which was observed when Br^-, DEP and/or NOM coexisted in this UV/PS system. However, the Br-DBPs were a short-lived form of bromine during the transformation of Br^– and were degraded by the excessive oxidants (e.g., $\text{S}{\text{O}}_{\text{4}}^{\bullet \text{-}}$ and HO^•). Instead, Br^- was eventually transformed into ${\text{BrO}}_{\text{3}}^{\text{-}}$, with free bromine acting as the requisite intermediate. The ${\text{BrO}}_{\text{3}}^{\text{-}}$ formation initially showed a delay before increasing monotonically. In general, raising the PS dosage and the initial Br^- concentrations enhanced both the maximum concentration of TBM and the formation of ${\text{BrO}}_{\text{3}}^{\text{-}}$, while increasing the amounts of DEP and NOM facilitated the former and inhibited the latter. The maximum concentration of TBM increased while the formation of ${\text{BrO}}_{\text{3}}^{\text{-}}$ was suppressed with increasing pH from 5.0 to 8.0. In addition, through simulating the steady-state concentration of radicals, it was found that the contribution of bromine atom radical (Br^•) towards oxidizing free bromine to ${\text{BrO}}_{\text{3}}^{\text{-}}$ was far greater than those of $\text{S}{\text{O}}_{\text{4}}^{\bullet \text{-}}$ and HO^•. The findings demonstrate the potential negative effects of Br^- on $\text{S}{\text{O}}_{\text{4}}^{·\text{-}}$-based AOPs, which need to be considered when this technology is applied in practice.

溴（溴^- ），这是在水体无所不在，不仅可以影响目标污染物的降解动力学，但也可形成不需要的副产物（如溴酸盐（${\text{溴}}_{\text{3}}^{\text{--}}$）和通过硫酸根的溴化消毒副产物（Br-DBPs）（$\text{小号}{\text{Ø}}_{\text{4}}^{·\text{--}}$）为基础的高级氧化工艺（AOP）。本研究发现，溴^-显著基于紫外线（UV）/过硫酸盐（PS）治疗抑制邻苯二甲酸二乙酯（DEP）的降解，并有效地转换成由所述反应性物质（自由基和游离溴）$\text{小号}{\text{Ø}}_{\text{4}}^{·\text{--}}$或在UV / PS系统中产生的羟基自由基（HO ^•）。这些反应性溴物种可以反过来，溴化DEP的酚降解中间体以及天然有机物质（NOM），得到BR-消毒副产物，包括三溴甲烷（TBM），其中观察到当溴^-，DEP和/或NOM共存在此UV / PS系统中。然而，BR-消毒副产物如下：Br的变换期间溴的短命形式^-和由过度的氧化剂（例如被降解，$\text{小号}{\text{Ø}}_{\text{4}}^{\bullet \text{--}}$和HO ^•）。相反，溴^-最终被转化成${\text{溴}}_{\text{3}}^{\text{--}}$，其中游离溴是必需的中间体。的${\text{溴}}_{\text{3}}^{\text{--}}$形成最初显示出延迟，然后单调增加。一般情况下，提高了PS的剂量和初始溴^-浓度增强二者TBM的最大浓度而形成的${\text{溴}}_{\text{3}}^{\text{--}}$，而增加DEP和NOM的量则促进前者并抑制后者。TBM的最大浓度在形成的同时增加。${\text{溴}}_{\text{3}}^{\text{--}}$pH值从5.0增​​加到8.0时，抑制作用被抑制。另外，通过模拟自由基的稳态浓度，发现溴原子自由基（Br ^•）对氧化游离溴为${\text{溴}}_{\text{3}}^{\text{--}}$ 远远大于 $\text{小号}{\text{Ø}}_{\text{4}}^{\bullet \text{--}}$和HO ^•。该发现证明BR的潜在负面影响^-上$\text{小号}{\text{Ø}}_{\text{4}}^{·\text{--}}$的AOP，在实际应用此技术时需要考虑。