This study proposed a sequential redox process to partially degrade tetrabromobisphenol A (TBBPA) within a reactor to a great extent. After 72 hours in an anoxic environment, 20 ppm of TBBPA could be effectively degraded by sulfurized zerovalent iron nanoparticles (S-nZVI) at concentrations of 2 g L^-1 and 4 g L^-1. Biphenol A (BPA) together with tri-, di-, and monobromobisphenol A was detected by high-performance liquid chromatography (HPLC) suggesting that TBBPA was debrominated by S-nZVI in a stepwise manner. Following the S-nZVI treatment, a persulfate-advanced oxidation process (PS-AOP) system with persulfate concentrations varied from 5 to 20 mM was incorporated to degrade the final debrominated byproduct, BPA, for 2 hours. The two-stage anoxic/oxic reactions at the same reactor with initial conditions (0.037 mM TBBPA, 4 g L^-1 of S-nZVI, pH 6 in anoxic stage, 20 mM of PS in the latter oxic stage) were investigated. The sulfurized layer played an important role in such a system and hypothetically contributes to increasing electron transfer from Fe⁰ core as well as hydrophobicity of the NP surface. It was demonstrated that the S-nZVI/PS-AOP system could effectively remediate TBBPA and BPA and consequently provide a promising strategy to remedy brominated organic pollutants in the environment.

中文翻译：

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连续硫化纳米级零价过硫酸铁工艺降解四溴双酚A的可行性

该研究提出了一种顺序氧化还原过程，以在很大程度上在反应器内部分降解四溴双酚 A (TBBPA)。在缺氧环境中放置 72 小时后，浓度为 2 g L ^-1和 4 g L ^{-1 的}硫化零价铁纳米粒子 (S-nZVI) 可有效降解 20 ppm TBBPA. 通过高效液相色谱 (HPLC) 检测到双酚 A (BPA) 以及三、二和单溴双酚 A，表明 TBBPA 以逐步方式被 S-nZVI 脱溴。在 S-nZVI 处理后，加入过硫酸盐浓度从 5 到 20 mM 不等的过硫酸盐高级氧化工艺 (PS-AOP) 系统，以降解最终脱溴副产物 BPA 2 小时。研究了在具有初始条件（0.037 mM TBBPA、4 g L ^-1的 S-nZVI、缺氧阶段的 pH 值 6、后一个好氧阶段的 20 mM PS）的同一反应器中的两阶段缺氧/好氧反应。硫化层在这样的系统中发挥了重要作用，并且假设有助于增加来自 Fe ^{0 的}电子转移核以及 NP 表面的疏水性。结果表明，S-nZVI/PS-AOP 系统可以有效地修复 TBBPA 和 BPA，从而为修复环境中的溴化有机污染物提供了一种有前景的策略。