Abstract A one-pot strategy for the preparation of NH2-MIL-88B(Fe)/CDs composite was successfully developed via a simple solvothermal synthesis method. NH2-MIL-88B(Fe)/CDs composites were characterized by XRD, FT-IR, SEM, TEM, XPS, UV–vis DRS, PL, transient photocurrent response and Mott-Schottky plots. The synthesized NH2-MIL-88B(Fe)/CDs composites exhibit stronger photocatalytic activity than the original NH2-MIL-88B(Fe) in both photoreduction of Cr(VI) and photodegradation of MB. This is mainly because on the one hand, there is an interaction at the interface between CDs and NH2-MIL-88B(Fe), and on the other hand, CDs in the composite as local electron acceptors can effectively enhance charge transfer and inhibit electron-hole recombination. The experimental results show that the pH value greatly affects the reduction efficiency of Cr(VI) over photocatalyst, and the addition of hole trapping agent is beneficial to photocatalytic reduction. Moreover, we have proposed the possible photocatalytic mechanism on composites through trapping experiments of active species. Importantly, cycling experiments have also revealed that NH2-MIL-88B(Fe)/CDs photocatalysts have good chemical stability and reusability, and have broad industrial application prospects.

中文翻译：

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锚定在金属有机骨架 NH2-MIL-88B(Fe) 上的碳纳米点作为一种新型可见光驱动光催化剂：光催化性能和机理研究

摘要 通过一种简单的溶剂热合成方法，成功开发了一种用于制备NH2-MIL-88B(Fe)/CDs 复合材料的一锅法。NH2-MIL-88B(Fe)/CDs 复合材料通过 XRD、FT-IR、SEM、TEM、XPS、UV-vis DRS、PL、瞬态光电流响应和 Mott-Schottky 图进行表征。合成的 NH2-MIL-88B(Fe)/CDs 复合材料在 Cr(VI) 的光还原和 MB 的光降解方面都表现出比原始 NH2-MIL-88B(Fe) 更强的光催化活性。这主要是因为一方面CDs与NH2-MIL-88B(Fe)的界面处存在相互作用，另一方面复合材料中的CDs作为局部电子受体可以有效增强电荷转移并抑制电子- 孔重组。实验结果表明，pH值对Cr(VI)在光催化剂上的还原效率有很大影响，空穴捕获剂的加入有利于光催化还原。此外，我们通过活性物种的捕获实验提出了复合材料可能的光催化机制。重要的是，循环实验还表明NH2-MIL-88B(Fe)/CDs光催化剂具有良好的化学稳定性和重复使用性，具有广阔的工业应用前景。