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采用2-甲基咪唑为主配体、1,2,4-三氮唑(3NIM)为修饰配体，与钴离子反应制备三氮唑修饰ZIF-67材料，通过配体修饰调节其表面形貌，得到了一种具有与ZIF-67相同晶体结构的金属-有机骨架材料ZIF-67 (3NIM)。红外光谱结果显示三氮唑配体进入ZIF-67的骨架中；热重分析表明，该材料具有良好的热稳定性；场发射扫描电镜结果表明，其粒径较3NIM修饰前增大，但随着修饰配体浓度的升高团簇现象变得更为严重。将ZIF-67 (3NIM)材料应用于碘单质的气相和液相吸附中，在75℃下对碘蒸气的吸附量可达到6.66g/g，较未修饰的ZIF-67 (碘吸附量5.16g/g)提高了29%；在环己烷溶液中的碘去除率也有显著提高，去除率最高可达97.5%。结果表明，氨基配体修饰的ZIF-67系列材料有望用于放射性碘的高效去除。
Abstract：2-methylimidazole was used as the main ligand and 1,2,4-triazole(3 NIM) as the modified ligand to react with cobalt ions to prepare triazole-modified ZIF-67 material,and adjust its surface shape through ligand modification.A class of metal-organic framework materials ZIF-67(3 NIM) with the same crystal structures as ZIF-67 was obtained.The infrared spectroscopy results show that the triazole ligand enter the framework of ZIF-67;TG analysis shows that the material has good thermal stability;field emission scanning electron microscopy results show that its particle size is larger than that before 3 NIM modification,but the cluster phenomenon becomes more serious with the increase of the concentration of the modified ligand.The ZIF-67(3 NIM) materials were applied to the gas phase and liquid phase adsorption experiments of elemental iodine.The adsorption capacity of iodine vapor at 75℃ can reach6.66 g/g,which increases by 29% of the unmodified ZIF-67(iodine adsorption capacity,5.16 g/g).The removal rate of iodine from the cyclohexane solution was also significantly increased with the removal rate up to 97.5%.Studies showed that ZIF-67 series materials modified with amino ligands are expected to be used for the efficient removal of radioactive iodine.
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基本信息:
DOI：10.16026/j.cnki.iea.2022010025
中图分类号:O641.4;O647.3;X771
引用信息:
[1]黄菊,陈乐,燕天祥,等.三氮唑修饰ZIF-67材料的制备及其对碘的捕获研究[J].离子交换与吸附,2022,38(01):25-34.DOI:10.16026/j.cnki.iea.2022010025.
基金信息:
国家自然科学基金(No.11775037,12175024); 江苏省高等学校自然科学研究重大项目(No.21KJA530001)
2022-02-20
2022-02-20