Degradation of 2,4,6-trichlorophenol (2,4,6-TCP) by zero-valent iron (ZVI) activating three common peroxides (peroxymonosulfate (PMS), hydrogen peroxide (H2O2), and peroxydisulfate (PS)) was investigated. The effects of ZVI dosage, peroxides concentration, initial pH, and Cl- concentration were examined. The 2,4,6-TCP degradation efficiencies by Fe0/peroxides (PMS, H2O2, PS) were compared. Results showed that the order for degradation efficiency was H2O2≥PMS>PS. The degradation efficiency of 2,4,6-TCP in ZVI/peroxides systems were optimal at c(Ox) = 1 mmol•L-1; c(Fe0) = 0.1 g/L; initial pH = 3.2. Additionally, pH had a vital effect on 2,4,6-TCP degradation. At pH<3.2, ferrous play a vital role in all reaction, and accelerate the reaction rate rapidly. The existence of NaCl showed different results in the four systems. Chloride had little effect on 2,4,6-TCP degradation when chloride concentration at 5 mM, whereas the presence of 300 mM chloride significantly accelerated the degradation of 2,4,6-TCP from 72.7% to 95.2% in ZVI-PMS system. Notably, the other three systems showed opposite results. In contrast, the AOX (Absorbable Organic Halogen) values were highest in ZVI-PMS-Cl- system, due to the formation of lots of refractory chlorinated phenols as identified by GC-MS. These findings are good for choosing the most suitable technology for chlorophenol wastewater treatment.

中文翻译：

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基于 Fe0 的高级氧化工艺 (AOP) 与普通过氧化物对 2,4,6-TCP 的降解效率。

研究了通过零价铁 (ZVI) 激活三种常见的过氧化物（过硫酸盐 (PMS)、过氧化氢 (H2O2) 和过硫酸盐 (PS)）降解 2,4,6-三氯苯酚 (2,4,6-TCP) . 检查了 ZVI 剂量、过氧化物浓度、初始 pH 值和 Cl- 浓度的影响。比较了 Fe0/过氧化物（PMS、H2O2、PS）对 2,4,6-TCP 的降解效率。结果表明，降解效率的顺序为H2O2≥PMS>PS。2,4,6-TCP 在 ZVI/过氧化物体系中的降解效率在 c(Ox) = 1 mmol•L-1 时最佳；c(Fe0) = 0.1 克/升；初始 pH = 3.2。此外，pH 值对 2,4,6-TCP 降解具有重要影响。在pH<3.2时，亚铁在所有反应中都起着至关重要的作用，并迅速加快反应速度。NaCl 的存在在四个系统中显示出不同的结果。当氯化物浓度为 5 mM 时，氯化物对 2,4,6-TCP 降解几乎没有影响，而 300 mM 氯化物的存在显着加速了 ZVI-PMS 系统中 2,4,6-TCP 的降解从 72.7% 到 95.2% . 值得注意的是，其他三个系统显示出相反的结果。相比之下，AOX（可吸收有机卤素）值在 ZVI-PMS-Cl- 系统中最高，这是由于 GC-MS 鉴定出大量难熔氯化酚的形成。这些发现有利于选择最合适的氯酚废水处理技术。AOX（可吸收有机卤素）值在 ZVI-PMS-Cl- 系统中最高，这是由于 GC-MS 鉴定出大量难熔氯化酚的形成。这些发现有利于选择最合适的氯酚废水处理技术。AOX（可吸收有机卤素）值在 ZVI-PMS-Cl- 系统中最高，这是由于 GC-MS 鉴定出大量难熔氯化酚的形成。这些发现有利于选择最合适的氯酚废水处理技术。