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 (SO4-) generation rate were 5.56 mM h-1 and 8.62 μM h-1, respectively. The generation rate and Rct of HO and SO4- at pH 3 and 50 °C in the Fe(II)/PS/HC system are 7584.6 μM h-1, 0.013 and 24.02 μM h-1, 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 × 10-2 min-1 at pH 3 and 50 °C. The activation energy was 10.68 kJ mol-1. In addition, the mechanism of PCP treatment in the Fe(II)/PS/HC system was a redox reaction, and the HO-/SO4- contribution was 81.1 and 18.9%, respectively. In this study, we first examined PCP oxidation through HO and SO4- 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.

中文翻译：

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过硫酸盐与水力空化作用及亚铁在五氯苯酚分解中的应用。

水动力空化（HC）和Fe（II）是高级氧化过程，其中五氯苯酚（PCP）通过活化过硫酸盐（PS）的氧化还原方法进行处理。使用电子自旋共振（ESR）自旋俘获技术和纯化合物进行自由基俘获，研究了水溶液中PS的HC和Fe（II）活化的动力学和机理。Fe（II）/ PS的最佳比例为1：2，羟基自由基（HO）和硫酸根自由基（SO4-）的生成速率分别为5.56 mM h-1和8.62μMh-1。在Fe（II）/ PS / HC系统中，在pH 3和50°C下，HO和SO4-的生成速率和Rct分别为7584.6μMh-1、0.013和24.02μMh-1、3.95。自由基的数目随着pH的增加而减少，并且随着温度的升高而增加。在pH 3和50°C下，PCP反应速率常数为4.39×10-2 min-1。活化能为10.68 kJ mol-1。此外，在Fe（II）/ PS / HC系统中PCP处理的机理是氧化还原反应，HO- / SO4-的贡献分别为81.1％和18.9％。在这项研究中，我们首先仅使用Fe（II）/ PS / HC工艺通过HO和SO4-定量研究了PCP氧化。此外，结果为HC和Fe（II）活化PS提供了基础，也为除PCP以外的类似有机处理提供了数据基础。