To surmount the obstacles of traditional Fenton method and synchronously utilize Cu and polyphenol in water, an improved Fenton-like reaction applying calcium peroxide (CaO) as HO source and regulating by the complex of Cu-tartaric acid (TA, a representative of polyphenol) was constructed. A typical antibiotic, metronidazole (MTZ) could be effectively eliminated by the Cu/TA/CaO system, and the optimized parameters were as follows: 0.1 mmol/L Cu, 2 mmol/L TA, 2 mmol/L CaO, and initial pH 5. UV spectrum confirmed the formation of Cu-TA complex, which promoted the Cu/Cu circulation through decreasing the Cu/Cu couple redox potential, which further enhanced the HO decomposition and the formation of reactive species. Hydroxyl radical was dominant for MTZ degradation, followed by oxygen and superoxide radical. The degradation intermediates of MTZ were detected and their evolution way was speculated. Furthermore, the ternary process showed a wide pH tolerance (3–8) for removing MTZ and broad applicability for eliminating other dyes and antibiotics. This work provided a reference for Cu-based Fenton-like strategy for organic wastewater settlement.

中文翻译：

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铜离子和酒石酸络合物增强过氧化钙芬顿反应降解甲硝唑

为了克服传统Fenton法的障碍，同步利用水中的Cu和多酚，采用过氧化钙（CaO）作为H2O来源并通过Cu-酒石酸（TA，多酚的代表）络合物调节的改进类Fenton反应被建造了。 Cu/TA/CaO体系可以有效消除典型抗生素甲硝唑（MTZ），优化参数为：0.1 mmol/L Cu、2 mmol/L TA、2 mmol/L CaO和初始pH 5.紫外光谱证实了Cu-TA络合物的形成，通过降低Cu/Cu电偶氧化还原电位促进了Cu/Cu循环，进一步促进了H2O分解和活性物种的形成。羟基自由基在 MTZ 降解中占主导地位，其次是氧自由基和超氧自由基。检测了MTZ的降解中间体并推测了其演化途径。此外，三元工艺在去除 MTZ 方面表现出广泛的 pH 耐受性 (3-8)，并且在消除其他染料和抗生素方面具有广泛的适用性。该工作为铜基类芬顿有机废水沉降策略提供了参考。