Cu0-Functionalized, ZIF-8-Derived, Nitrogen-Doped Carbon Composites for Efficient Iodine Elimination in Solution

文献类型： 外文期刊

第一作者： Chen, Jiuyu

作者： Chen, Jiuyu;Gao, Chensheng;Liu, Zhiwen;Chen, Jingwen;Liu, Fei

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关键词： ZIF-8; Cu-0 nanoparticles; iodine; adsorption; DFT studies

期刊名称：NANOMATERIALS （ 影响因子：4.3； 五年影响因子：4.7 ）

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年卷期： 2025 年 15 卷 2 期

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收录情况： SCI

摘要： The development of copper-based materials with a high efficiency and low cost is desirable for use in iodine (I-2) remediation. Herein, Cu-0-nanoparticles-functionalized, ZIF-8 (Zeolite Imidazole Framework-8)-derived, nitrogen-doped carbon composites (Cu@Zn-NC) were synthesized by ball milling and pyrolysis processes. The as-prepared composites were characterized using SEM, BET, XRD, XPS, and FT-IR analyses. The results showed that the morphology of ZIF-8 changed from a leaf-like structure into an irregular structure after the introduction of a copper salt and carbonization. The copper in the pyrolysis samples was mainly in the form of Cu-0 particles. The presence of an appropriate amount of Cu-0 particles could increase the specific surface area of Cu@Zn-NC. The subsequent batch adsorption results demonstrated that the as-fabricated composites showed high I-2 adsorption amounts (1204.9 mg/g) and relatively fast dynamics in an iodine-cyclohexane solution when the Cu content was 30% and the pyrolysis temperature was 600 degrees C, outperforming the other Cu-based materials. The isothermal adsorption followed both Langmuir and Dubinin-Radushkevich isotherm models, while the kinetics of I-2 adsorption followed a pseudo-second-order kinetic model. The activation energy (E-alpha) of the adsorbent was determined to be 47.2 kJ/mol, according to the Arrhenius equation. According to the experimental and DFT analyses, I-2-Zn interactions and I-2-Cu-0 chemisorption jointly promoted the elimination of iodine. In general, this study provided an operative adsorbent for the highly effective capture of iodine in solution, which might be worth applying on a large scale.

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