School of Civil, Environmental, and Architectural Engineering, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea.
Korea Environmental Industry and Technology, 215 Jinheung-no, Eunpyeong-gu, Seoul 03367, Republic of Korea.
Ultrason Sonochem. 2020 Sep;66:105106. doi: 10.1016/j.ultsonch.2020.105106. Epub 2020 Mar 29.
Hydrodynamic cavitation (HC) and Fe(II) are advanced oxidation processes, in which pentachlorophenol (PCP) is treated by the redox method of activating persulfate (PS). The kinetics and mechanism of the HC and Fe(II) activation of PS were examined in aqueous solution using an electron spin resonance (ESR) spin trapping technique and radical trapping with pure compounds. The optimum ratio of Fe(II)/PS was 1:2, and the hydroxyl radical (HO) and sulfate radical (SO) generation rate were 5.56 mM h and 8.62 μM h, respectively. The generation rate and R of HO and SO at pH 3 and 50 °C in the Fe(II)/PS/HC system are 7584.6 μM h, 0.013 and 24.02 μM h, 3.95, respectively. The number of radicals was reduced as the pH increased, and it increased with increasing temperature. The PCP reaction rate constants was 4.39 × 10 min at pH 3 and 50 °C. The activation energy was 10.68 kJ mol. In addition, the mechanism of PCP treatment in the Fe(II)/PS/HC system was a redox reaction, and the HO/SO contribution was 81.1 and 18.9%, respectively. In this study, we first examined PCP oxidation through HO and SO quantification using only the Fe(II)/PS/HC process. Furthermore, the results provide the foundation for activation of PS by HC and Fe(II), but also provide a data basis for similar organic treatments other than PCP.
水动力空化（HC）和 Fe(II) 是高级氧化工艺，其中五氯苯酚（PCP）通过激活过硫酸盐（PS）的氧化还原方法进行处理。使用电子顺磁共振（ESR）自旋捕获技术和纯化合物的自由基捕获，在水溶液中研究了 HC 和 Fe(II) 激活 PS 的动力学和机制。Fe(II)/PS 的最佳比例为 1:2，羟基自由基（HO）和硫酸根自由基（SO）的生成速率分别为 5.56 mM h 和 8.62 μM h。在 Fe(II)/PS/HC 体系中，pH 3 和 50°C 时，HO 和 SO 的生成速率和 R 分别为 7584.6 μM h、0.013 和 24.02 μM h、3.95。随着 pH 值的升高，自由基的数量减少，随着温度的升高而增加。PCP 的反应速率常数在 pH 3 和 50°C 时为 4.39×10 min。活化能为 10.68 kJ mol。此外，Fe(II)/PS/HC 体系中 PCP 处理的机制是一种氧化还原反应，HO/SO 的贡献分别为 81.1%和 18.9%。在本研究中，我们首次仅通过 Fe(II)/PS/HC 工艺研究了 PCP 的氧化过程，并用 HO 和 SO 进行了定量分析。此外，研究结果为 HC 和 Fe(II) 激活 PS 提供了依据，同时也为其他有机化合物的类似处理提供了数据基础。
