【摘要】 采用陈化法合成了一种铁基沸石咪唑酯骨架材料（Fe-ZIF），考察了该材料在溶液体系中对钨（W）和钼（Mo）元素的吸附与分离性能。在吸附过程中，分别研究了pH、吸附温度、吸附时间对钨和钼吸附分离性能的影响。采用红外光谱表征和模拟计算研究Fe-ZIF的吸附和分离机理。研究结果表明：在制备过程中，合成时间从24 h延长至72 h可显著提升Fe-ZIF的结晶度，Fe-ZIF产率提高至63%。Fe-ZIF为球形颗粒，该颗粒的平均粒径为114.5 nm。在碱性条件下，较低温度、较长时间有利于提升钨的吸附容量以及钨和钼分离系数。最优条件为：p H=9，吸附温度T=35℃，吸附时间t=4 h。在此最优条件下，Fe-ZIF对W最大吸附容量为547 mg/g，分离系数为35.8。经过5次吸附—解吸循环，Fe-ZIF的解吸率保持在74%以上，Fe-ZIF对W的吸附容量保持率为77.3%,Fe-ZIF可以循环使用。材料上的金属位点Fe对WO₄^2-的亲和性强于对MoO₄^2-的亲和性，从而实现了Fe-ZIF对钨的选择性吸附。Fe-ZIF与WO₄^2-形成配位作用，负载在Fe-ZIF表面与孔道内部，实现了Fe-ZIF对WO₄^2-的吸附。Fe-ZIF作为一种可持续且对环境友好的吸附剂，具有良好的钨和钼分离应用效果，有利于实现钨和钼资源的高效与高值化回收利用。更多还原

【Abstract】 A kind of iron-based zeolite imidazolate framework material（Fe-ZIF） was synthesized using aging method in this study, the adsorption and separation performance for tungsten（W） and molybdenum（Mo） was investigated. The effects of pH value, adsorption temperature, and adsorption time on the adsorption and separation performance of tungsten and molybdenum were studied separately. The adsorption and separation mechanism of Fe-ZIF was investigated using infrared spectroscopy characterization and computational simulations. The results show that the crystallization of Fe-ZIF can be improved and the yield can be increased to 63% by extending the synthesis time from 24 h to 72 h in the process of preparation. Fe-ZIF exhibits spherical morphology with an average particle size of 114.5 nm. The alkaline conditions, lower temperatures, and longer time are beneficial for the improvement of the adsorption capacity and separation factor. Under the optimal conditions of pH=9, T=35 ℃, and t=4 h, the maximum adsorption capacity of Fe-ZIF for W is 547 mg/g, and the separation factor is 35.8. After five cycles of adsorption-desorption, the dersorption efficiency of Fe-ZIF remains above 74%, and the adsorption capacity retention efficiency for Mo is 77.3%, which indicates that Fe-ZIF has reusability. The Fe metal sites on the material exhibit stronger affinity for WO₄^2-than for MoO₄^2-, enabling the selective adsorption of tungsten by Fe-ZIF. WO₄^2-to form coordination interactions with Fe-ZIF, loading onto both the surface and internal pores of the material, thereby achieving the adsorption of WO₄^2-by Fe-ZIF. Fe-ZIF is a sustainable and environmentally-friendly adsorbent, and this material demonstrates promising potential for tungsten and molybdenum separation applications, which facilitates the efficient and high-value recycling and utilization of tungsten and molybdenum resources.更多还原