Zeolite Imidazolate Framework-8 Metal–Organic Frameworks Embedded with Bimetallic Fe/Pd Nanoparticles for Reductive Dechlorination,ACS Applied Energy Materials

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Zeolite Imidazolate Framework-8 Metal–Organic Frameworks Embedded with Bimetallic Fe/Pd Nanoparticles for Reductive Dechlorination
ACS Applied Energy Materials ( IF 5.4 ) Pub Date : 2020-07-21 00:00:00 , DOI: 10.1021/acsanm.0c01513
Long Zhou ₁ , Xiaoying Jin ₁ , Zuliang Chen ₁

Affiliation

Bimetallic Fe/Pd nanoparticles are often used for reductive dechlorination. However, the disadvantage of using bimetallic nanoparticles is their potential aggregation, and hence reduced reactivity. To address these problems, a zeolite imidazolate framework-8 (ZIF-8) embedded with bimetallic Fe/Pd nanoparticles was successfully synthesized. Results revealed that 85.2% of 2,4-dichlorophenol was removed by ZIF-8-Fe/Pd at a pH value of 6 within 120 min and 78.8% by ZIF-8 and 46.3% by Fe/Pd, respectively. The surface composition and morphology were subsequently characterized by a variety of techniques. X-ray diffraction revealed a ZIF-8 encapsulating Fe⁰ with 2θ of 44.9°, while Fourier transform infrared showed that incorporating Fe/Pd did not destroy the ZIF-8 structure. Scanning electron microscopy, energy-dispersive spectrometry, and transmission electron microscopy demonstrated that Fe/Pd nanoparticles were uniformly distributed in ZIF-8 and the composite was highly crystalline. X-ray photoelectron spectroscopy indicated that Fe⁰ was presented inside the composite. Finally, a mechanism for the formation of ZIF-8-Fe/Pd was proposed. Testing of both the stabilization and reusability of ZIF-8-Fe/Pd indicated that ZIF-8-supported Fe/Pd nanoparticles have the potential for removing organic contaminates such as 2,4-dichlorophenol by reductive dechlorination.

中文翻译：

沸石咪唑盐骨架-8嵌入双金属Fe / Pd纳米粒子的金属有机骨架用于还原脱氯

双金属Fe / Pd纳米粒子通常用于还原性脱氯。然而，使用双金属纳米颗粒的缺点是其潜在的聚集，因此降低了反应性。为了解决这些问题，成功地合成了嵌入双金属Fe / Pd纳米粒子的沸石咪唑酸酯骨架8（ZIF-8）。结果显示，在120分钟内，pH为6的ZIF-8-Fe / Pd去除了85.2％的2,4-二氯苯酚，ZIF-8和Fe / Pd分别去除了pH值为6的78.8％和26.3％。随后通过多种技术表征表面组成和形态。X射线衍射显示ZIF-8包封Fe ⁰2θ为44.9°，而傅立叶变换红外光谱表明掺入Fe / Pd不会破坏ZIF-8结构。扫描电子显微镜，能量分散光谱和透射电子显微镜表明，Fe / Pd纳米颗粒均匀地分布在ZIF-8中，并且复合物是高度结晶的。X射线光电子能谱表明，Fe ^0存在于复合物中。最后，提出了形成ZIF-8-Fe / Pd的机理。对ZIF-8-Fe / Pd的稳定性和可重复使用性的测试表明，ZIF-8负载的Fe / Pd纳米颗粒具有通过还原脱氯去除有机污染物（例如2,4-二氯苯酚）的潜力。

更新日期：2020-07-21

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