A novel Fenton-like catalyst was synthesized by immobilizing nano-Fe2O3 (nFe2O3) on MIL-53(Cu). The pseudo-first-order rate constant of bisphenol A degradation in the nFe2O3/MIL-53(Cu)/H2O2 system reached 0.0123 min-1, while the values in MIL-53(Cu)/H2O2 and nFe2O3/H2O2 systems were only 0.0026 and 0.0040 min-1, respectively. The characterization of nFe2O3/MIL-53(Cu) reveals that the supreme catalytic activity of this material could be ascribed to iron-copper synergy, smaller size, and better dispersion of nFe2O3 particles. Moreover, a method of trapping Cu(I) by neocuproine was developed, which could shield Cu(I) from interacting with iron and H2O2, and thus allow quantitative differentiation of the contribution to the enhanced catalytic activity by each of the factors. Using this method, 19% of the enhancement was determined to be contributed by synergistic effect, while 24% of the enhancement was due to the smaller size and better dispersion of the nFe2O3 particles on MIL-53(Cu) support. In addition, the performance of nFe2O3/MIL-53(Cu) only dropped 10.7% after five treatment cycles in real wastewater, showing good potential in practical application. We believe this study sheds light on the tailored design of Fenton-like catalysts and elucidates the catalytic mechanisms of supported bimetallic catalysts.

中文翻译：

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通过 MIL-53(Cu) 载体增强 nFe2O3 的类芬顿催化活性：机理研究。

通过将纳米 Fe2O3 (nFe2O3) 固定在 MIL-53(Cu) 上合成了一种新型类芬顿催化剂。nFe2O3/MIL-53(Cu)/H2O2体系中双酚A降解准一级速率常数达到0.0123 min-1，而MIL-53(Cu)/H2O2和nFe2O3/H2O2体系中仅为分别为 0.0026 和 0.0040 min-1。nFe2O3/MIL-53(Cu) 的表征表明，这种材料的最高催化活性可归因于铁铜协同作用、更小的尺寸和更好的 nFe2O3 颗粒分散性。此外，开发了一种通过新铜灵捕获 Cu(I) 的方法，该方法可以保护 Cu(I) 不与铁和 H2O2 相互作用，从而可以定量区分每个因素对增强催化活性的贡献。使用这种方法，确定 19% 的增强是由协同效应贡献的，而 24% 的增强是由于 nFe2O3 颗粒在 MIL-53(Cu) 载体上的尺寸更小和分散性更好。此外，nFe2O3/MIL-53(Cu)在实际废水处理5次循环后性能仅下降10.7%，显示出良好的实际应用潜力。我们相信这项研究揭示了类芬顿催化剂的定制设计，并阐明了负载型双金属催化剂的催化机制。