Efficient iodine capture by ethylene diamine grafted ZIF-11-NH2 metal-organic framework

IF 3.2 4区化学 Q2 CHEMISTRY, MULTIDISCIPLINARY

Journal of the Indian Chemical Society Pub Date : 2025-06-28 DOI:10.1016/j.jics.2025.101864

Reza Sacourbaravi, Zeinab Ansari-Asl

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引用次数: 0

Abstract

Generating efficient and clean energy from nuclear power has attracted much attention. However, the improper disposal of radionuclides (especially ¹²⁹I and ¹³¹I), originating from nuclear fuel processes poses significant risks to the environment and human well-being. So, fabricating reliable sorbents to uptake radioactive wastes is an urgent need. ZIF-11 as a typical MOF (metal–organic framework), represents good potential for this purpose. In this study, to enhance the iodine capture performance of ZIF-11, amine-functionalized ZIF-11 (ZIF-11-NH₂) and ethylene diamine (EDA) grafted ZIF-11-NH₂ (EDA@ZIF-11-NH₂) were synthesized. The EDA@ZIF-11-NH₂ (4030 mg g⁻¹) and ZIF-11-NH₂ (2300 mg g⁻¹) exhibited higher adsorption efficiency compared to the pristine ZIF-11 (1050 mg g⁻¹). Various techniques are used to characterize the structure of fabricated compounds, such as FT-IR (Fourier-transform infrared) spectroscopy, PXRD (powder X-ray diffraction), field emission scanning electron microscopy (FESEM), and EDS (energy-dispersive X-ray spectroscopy) mapping. According to the SEM images, the ZIF-11 and ZIF-11-NH₂ have the same morphology. The EDA@ZIF-11-NH₂ was stable and recyclable during the uptake iodine process, indicating its potential as an outstanding sorbent material. The kinetic adsorption analysis demonstrated that the adsorption of iodine onto EDA@ZIF-11-NH₂ followed pseudo-second-order kinetics, indicating that chemisorption is the predominant mechanism governing the adsorption process.

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乙二胺接枝ZIF-11-NH2金属有机骨架的高效碘捕获

利用核能生产高效、清洁的能源已经引起了人们的广泛关注。然而，不当处置源自核燃料加工的放射性核素（特别是129I和131I）对环境和人类福祉构成重大风险。因此，迫切需要研制可靠的吸附剂来吸收放射性废物。ZIF-11作为一种典型的金属有机骨架（MOF），具有良好的应用潜力。为了提高ZIF-11的碘捕获性能，本研究合成了胺功能化的ZIF-11 （ZIF-11- nh2）和乙二胺接枝的ZIF-11- nh2 （EDA@ZIF-11-NH2）。EDA@ZIF-11-NH2 （4030 mg g−1）和ZIF-11- nh2 （2300 mg g−1）的吸附效率高于ZIF-11 （1050 mg g−1）。各种技术被用来表征合成化合物的结构，如FT-IR（傅里叶变换红外）光谱、PXRD（粉末x射线衍射）、场发射扫描电子显微镜（FESEM）和EDS（能量色散x射线光谱）作图。SEM图像显示，ZIF-11和ZIF-11- nh2具有相同的形貌。EDA@ZIF-11-NH2在碘吸收过程中稳定且可回收，表明其作为一种出色的吸附材料的潜力。动力学吸附分析表明，碘在EDA@ZIF-11-NH2上的吸附符合准二级动力学，表明化学吸附是控制吸附过程的主要机制。

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来源期刊

Journal of the Indian Chemical Society 化学-化学综合

CiteScore

3.50

自引率

7.70%

发文量

492

审稿时长

3-8 weeks

期刊介绍： The Journal of the Indian Chemical Society publishes original, fundamental, theorical, experimental research work of highest quality in all areas of chemistry, biochemistry, medicinal chemistry, electrochemistry, agrochemistry, chemical engineering and technology, food chemistry, environmental chemistry, etc.