<br>Fenton 反应中 Fe（III）还原增强 Ni-EDTA 的解构：深入了解羰基的作用,Journal of Environmental Chemical Engineering

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Fenton 反应中 Fe（III）还原增强 Ni-EDTA 的解构：深入了解羰基的作用
Journal of Environmental Chemical Engineering ( IF 7.4 ) Pub Date : 2023-09-23 , DOI: 10.1016/j.jece.2023.111097
Meiling Chen , Lin Ding , Shijun Zhu , Xiuqin Xiong , Xinkai Yuan , Yanhua Peng , Liming Yang , Hui Shi , Penghui Shao , Xubiao Luo

Fenton 反应过程中缓慢的 Fe（II）/Fe（III）循环强烈阻碍了实际应用中的氧化效率。在本研究中，活性炭（AC）辅助 Fenton 反应系统用于处理含有 Ni-乙二胺四乙酸（Ni-EDTA）的电镀废水。发现 AC 可增强 Fenton/Fenton 样反应中 Ni-EDTA 的去除。报道的结果表明，AC 可以通过电子转移有效地促进 Fe（II）从 Fe（III）物种再生以改善反应，而不是直接增强 H2O2 分解以加速羟基自由基（•OH）的产生。淬灭实验和 EPR 还表明 •OH 和 •O2− 参与了自由基氧化过程，其中 •OH 的贡献占主导地位。XPS 和 FT-IR 分析进一步证实，AC 表面的羰基（CO）确实可以作为优势活性位点和电子供体直接还原 Fe（III）。此外，电化学测试表明，交流可以提高 Fe（III）的氧化电位，从而促进 Fe（III）和 H2O2 之间的反应，从而使电子从 H2O2 转移到 Fe（III）以促进 Fe（II）/Fe（III）循环。这项研究可能有助于对 AC 催化的 Fenton 氧化过程对解络合重金属-EDTA 的机制有新的认识。

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Decomplexation of Ni-EDTA enhanced by Fe(III) reduction in the Fenton reaction: Insight into the role of carbonyl groups

The slow Fe(II)/Fe(III) cycle during the Fenton reaction process strongly impedes oxidation efficiency in practical applications. In this study, an activated carbon (AC) assisted Fenton reaction system was used to treat electroplating wastewater containing Ni-ethylenediaminetetraacetic acid (Ni-EDTA). AC was found to enhance the removal of Ni-EDTA in Fenton/Fenton-like reactions. The reported results revealed that AC could effectively promote the regeneration of Fe(II) from Fe(III) species via electron transfer to improve the reaction rather than directly enhancing the H2O2 decomposition to accelerate the production of hydroxyl radicals (•OH). Quenching experiments and EPR also demonstrated that •OH and •O2− took part in the radical oxidation process, in which the contribution of •OH was dominant. XPS and FT-IR analysis further confirmed that the carbonyl group (CO) on the surface of AC could indeed act as the dominant active site and an electron donor to directly reduce Fe(III). In addition, electrochemical tests indicated that AC could increase the oxidation potential of Fe(III) to boost the reaction between Fe(III) and H2O2, thus enabling the transfer of electrons from H2O2 to Fe(III) to facilitate the Fe(II)/Fe(III) cycle. This study might contribute to a new insight into the mechanisms of AC-catalyzed Fenton oxidation processes for the decomplexation heavy metal-EDTA.

更新日期：2023-09-23

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