HKUST-1 金属有机框架(MOF)由于其配位不饱和金属位点、高表面积和微孔性,是最突出的 MOF 候选材料之一。我们的研究调查了将铁掺杂到 HKUST-1 MOF 中对其水稳定性的影响,并证明了其去除 Pb(II) 的可用性。使用简单的一锅溶剂热法合成具有不同 Fe 掺杂浓度(5-20 mol%)的 Fe 掺杂 HKUST-1 MOF。通过各种表征技术(XPS、XRD、FTIR、ICP-OES)和 MD 模拟,我们证明了 Fe 结合到 HKUST-1 框架中,这是通过 Fe 取代 Cu(II) 位点发生的。使用实验和建模方法进行的水稳定性研究表明,与原始 HKUST-1 MOF 相比,部分取代的 Fe-HKUST-1 MOF 具有更大的表面积保留,结晶度损失很小。低至 5 mol% 的 Fe 取代显着提高了 HKUST-1 MOFs 的水稳定性,其中结构在长达 10 小时的水处理中保持完整。类似地,5 mol% Fe 掺杂使从 HKUST-1 MOF 框架中浸出的 Cu 量减少了 53%。Fe掺杂的HKUST-1 MOFs表现出非常高的Pb(II)选择性、>90%的Pb(II)去除效率和565 mg/g的高Pb(II)吸附容量 其中结构在长达 10 小时的水处理中完好无损。类似地,5 mol% Fe 掺杂使从 HKUST-1 MOF 框架中浸出的 Cu 量减少了 53%。Fe掺杂的HKUST-1 MOFs表现出非常高的Pb(II)选择性、>90%的Pb(II)去除效率和565 mg/g的高Pb(II)吸附容量 其中结构在长达 10 小时的水处理中完好无损。类似地,5 mol% Fe 掺杂使从 HKUST-1 MOF 框架中浸出的 Cu 量减少了 53%。Fe掺杂的HKUST-1 MOFs表现出非常高的Pb(II)选择性、>90%的Pb(II)去除效率和565 mg/g的高Pb(II)吸附容量-1。这项研究开辟了使用掺杂作为提高 HKUST-1 MOF 水稳定性的策略的可能性,并在此过程中提高了其在环境修复应用中的适用性。
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Fe doped bimetallic HKUST-1 MOF with enhanced water stability for trapping Pb(II) with high adsorption capacity
HKUST-1 Metal-Organic Framework (MOF), due to its coordinatively unsaturated metal sites, high surface area and microporosity, is one the most prominent MOF candidates. Our study investigates the consequence of doping iron into HKUST-1 MOF on its hydrostability, and demonstrates its usability for Pb(II) removal. A simple one-pot solvothermal process was used to synthesize Fe doped HKUST-1 MOF with varying dopant concentrations of Fe (5-20 mol%). Through various characterisation techniques (XPS, XRD, FTIR, ICP-OES) and MD simulations we demonstrated the incorporation of Fe into the HKUST-1 framework, which happened through Fe substituting the Cu(II) sites. Water stability studies using experimental and modelling approaches demonstrated that partial substituted Fe-HKUST-1 MOFs have a greater surface area retention with very little loss in crystallinity as compared to pristine HKUST-1 MOF. Fe substitution of as low as 5 mol% yielded a significant enhancement in the hydrostability of HKUST-1 MOFs, wherein the structure was intact for up to 10 hrs of water treatment. Similarly, 5 mol% Fe doping had a 53% reduction in the amount of Cu being leached out from the HKUST-1 MOF framework. Fe doped HKUST-1 MOFs showed exceptionally high Pb(II) selectivity, Pb(II) removal efficiency of >90%, and a high Pb(II) adsorption capacity of 565 mg g-1. This study opens up the possibility of using doping as a strategy to enhance the hydrostability of HKUST-1 MOF and in the process improve its applicability for environmental remediation applications.