The article presents a study on the synergistic effect of electrooxidation in activating persulfate (PDS) with iron phosphide (Fe3P) for the simultaneously removal of organic (phenol) and inorganic (As) pollutants. The removal efficiencies and kinetics of pollutants removal in a developed EF/Fe3P/PDS system with combination of electro-Fenton (EF) and PDS activation were explored. The optimal conditions for pollutants removal in the EF/Fe3P/PDS system were identified as initial pH of 3, a current density of 3.6 mA cm−2, 0.10 g Fe3P and 4 mM PDS, achieving complete removal of phenol and As within 30 min and 94 % TOC removal in 4 h. The removal efficiencies of phenol were 35 %, 55 % and 100 % in the Fe3P/PDS, EF/PDS and EF/Fe3P/PDS systems, demonstrating the synergistic effect of EF and Fe3P on the activation of PDS. The reaction mechanism and synergistic effect of EF and PDS activation for phenol and As removal were evaluated by electrochemical experiments, characterization of the morphology and composition of Fe3P, electron paramagnetic resonance (EPR) and quenching detection. PDS and in-situ generated H2O2 could be activated by Fe3P to form SO4•− and •OH for efficient removal of pollutants, as well, Fe3P played an important role in absorbing As(V) at pH 7. X-ray photoelectron spectroscopy (XPS) results illustrate a decrease of Fe2+/Fetotal ratio from 63.33 % to 35.41 %, which also suggests that Fe element was mainly involved in the oxidation pathway. The study highlights the potential of the EF/Fe3P/PDS system as an effective method for treating wastewater containing both organic and inorganic pollutants, with the benefit of As adsorption. The findings contribute to the development of environmentally friendly and cost-effective wastewater treatment technologies.

中文翻译：

---

电氧化对磷化铁过硫酸盐活化去除苯酚和砷的有效协同作用：性能和机理


本文介绍了电氧化在活化过硫酸盐 （PDS） 和磷化铁 （Fe3P） 以同时去除有机（苯酚）和无机 （As） 污染物方面的协同作用的研究。探讨了在开发的结合电芬顿 （EF） 和 PDS 活化的 EF/Fe3P/PDS 系统中去除污染物的效率和动力学。EF/Fe3P/PDS 系统中去除污染物的最佳条件确定为初始 pH 值为 3、电流密度为 3.6 mA cm-2、0.10 g Fe3P 和 4 mM PDS，在 30 分钟内实现苯酚和 As 的完全去除，并在 4 小时内去除 94% 的 TOC。Fe3P/PDS、EF/PDS 和 EF/Fe3P/PDS 体系中苯酚的去除效率分别为 35 %、55 % 和 100 %，证明了 EF 和 Fe3P 对 PDS 活化的协同作用。通过电化学实验、Fe3P 形貌和组成的表征、电子顺磁共振 （EPR） 和淬灭检测评价 EF 和 PDS 活化去除苯酚和 As 的反应机理和协同效应。PDS 和原位生成的 H2O2 可被 Fe3P 活化形成 SO4•− 和 •OH 以有效去除污染物，此外，Fe3P 在 pH 值为 7 时在吸收 As（V） 方面起着重要作用。X 射线光电子能谱 （XPS） 结果表明，Fe2+/Fetotal 比率从 63.33 % 降低到 35.41 %，这也表明 Fe 元素主要参与氧化途径。该研究强调了 EF/Fe3P/PDS 系统作为处理含有有机和无机污染物的废水的有效方法的潜力，并具有 As 吸附的优势。这些发现有助于开发环保且具有成本效益的废水处理技术。