The complex of heavy metals and organic acids leads to high difficulty in heavy metals separation by traditional technologies. Meanwhile, alkaline precipitation commonly used in industry causes the great consumption of resources and extra pollution. Herein, the effective decomplexation of Cu(Ⅱ)-EDTA and synchronous recycling of Cu were realized by contact-electro-catalysis (CEC) coupled with capacitive deionization (CDI) innovatively. In particular, fluorinated ethylene propylene (FEP) as dielectric powders could generate reactive oxygen species under ultrasonic stimulation, realizing continuous deaminization and decarboxylation of Cu(Ⅱ)-EDTA and accelerating the totally breakage of Cu-O and Cu-N bonds. Additionally, the degradation pathway and intermediates evolution of Cu(Ⅱ)-EDTA were investigated using various characterization methods. It was confirmed that decarboxylation predominantly governed the degradation process of Cu(Ⅱ)-EDTA in CEC. During the course of treatment, the degradation ratio of Cu(Ⅱ)-EDTA reached 86.4 % within 150 min. Impressively, this strategy had satisfactory applicability to other metal combinations and excellent cycle stability. Subsequently, the released Cu ions were captured by CuSe cathode electrode through CDI. This research elucidated the degradation mechanism of persistent organic pollutant during CEC, and provided a novel approach for efficiently treating industrial wastewater containing metal complexes and advancing the exploitation and utilization of new technologies for metal recovery.

中文翻译：

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使用集成接触电催化和电容去离子从电镀废水中同时进行 Cu(II)-EDTA 解络和 Cu(II) 回收


重金属与有机酸的络合物导致传统技术分离重金属的难度较大。同时，工业上普遍采用的碱性沉淀造成了资源的大量消耗和额外的污染。在此，创新性地通过接触电催化（CEC）结合电容去离子（CDI）实现了Cu（Ⅱ）-EDTA的有效解络和Cu的同步回收。特别是氟化乙烯丙烯（FEP）作为介电粉末，在超声波刺激下可产生活性氧，实现Cu（Ⅱ）-EDTA的连续脱氨和脱羧，加速Cu-O和Cu-N键的完全断裂。此外，利用各种表征方法研究了Cu(Ⅱ)-EDTA的降解途径和中间体的演变。证实脱羧作用主要控制CEC中Cu(Ⅱ)-EDTA的降解过程。处理过程中，150 min内Cu(Ⅱ)-EDTA的降解率达到86.4%。令人印象深刻的是，该策略对其他金属组合具有令人满意的适用性和出色的循环稳定性。随后，释放的 Cu 离子通过 CDI 被 CuSe 阴极电极捕获。该研究阐明了CEC过程中持久性有机污染物的降解机理，为高效处理含金属络合物工业废水、推进金属回收新技术的开发利用提供了新途径。