具有水解稳定性的 Cu-咪唑酯 MOF 纳米片，用于选择性捕获并同时去除多种重金属离子,Environmental Science: Nano

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具有水解稳定性的 Cu-咪唑酯 MOF 纳米片，用于选择性捕获并同时去除多种重金属离子
Environmental Science: Nano ( IF 5.8 ) Pub Date : 2024-03-05 , DOI: 10.1039/d3en00754e
Prathmesh Bhadane ₁ , Priya Mahato ₁ , Dhruv Menon ₂ , Biraj Kanta Satpathy ₁ , Lisi Wu ₃ , Swaroop Chakraborty ₃ , Prateek Goyal ₁ , Iseult Lynch ₃ , Superb K. Misra ₁

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全球水安全危机需要寻求可大规模部署的经济高效、可持续的水净化解决方案。当前类别的吸附剂主要针对高度特异性的一元金属离子系统定制，很大程度上限制了它们对现实场景的适用性。因此，为了创建有效的净化过程，必须了解吸附剂在多组分系统中的潜力。在这里，水解稳定的铜-咪唑盐（Cu-Im）金属有机骨架（MOF）纳米片作为分子筛用于捕获多种重金属污染物。这些纳米片在环境温度和大气压下快速合成（30 分钟内），无需进行后修饰或功能化。针对四种重金属离子的吸附实验显示出显着的吸附能力：Pb( II )为492 mg g ^-1 ， Cd( II )为327 mg g ^-1，Mn( II )为233.1 mg g ^-1 ， Mn( II )为72.6 mg g ^{-1 。}对于 Ni( II )。值得注意的是，在多组分和工业废水环境中，与其他非功能化 MOF 和沸石等多孔材料相比，Cu-Im 表现出卓越的去除效率。此外，Cu-Im表现出强大的可回收性，在三个吸附循环中对Pb( II )、Mn( II )、Cd( II )和Ni( II )的去除效率保持在99%、90%、60%和70%。使用模型水生生物细胞模型（斑马鱼 ZF4 细胞系）进行的兼容性评估显示，在 48 小时内细胞活力没有显着降低。Cu-Im 的稳定性使用机器学习算法以全球 125 个 MOF 谱为基准。此外，Cu-Im 符合“绿色化学”十二项原则中的七项，将自身打造为应对紧迫的全球挑战的可持续、可扩展、稳定和可重复使用的解决方案。

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Hydrolytically stable nanosheets of Cu–imidazolate MOF for selective trapping and simultaneous removal of multiple heavy metal ions

The global water security crisis necessitates the pursuit of cost-effective and sustainable water purification solutions that can be deployed at large scales. The current class of adsorbents are predominantly tailored towards highly specific unary metal ion systems, largely constraining their applicability to realistic scenarios. Thus, to create effective decontamination processes, it is essential to understand the adsorbent's potential in multicomponent systems. Here, hydrolytically stable copper–imidazolate (Cu–Im) metal–organic framework (MOF) nanosheets are presented as molecular sieves for trapping multiple heavy metal contaminants. These nanosheets are synthesized rapidly (within 30 minutes), at ambient temperature and atmospheric pressure, obviating the necessity for post-modification or functionalization. Adsorption experiments targeting four heavy metal ions revealed remarkable adsorption capacities: 492 mg g⁻¹ for Pb(II), 327 mg g⁻¹ for Cd(II), 233.1 mg g⁻¹ for Mn(II) and 72.6 mg g⁻¹ for Ni(II). Notably, in multi-component and industrial effluent settings, Cu–Im exhibited superior removal efficiency compared to other non-functionalised MOFs and classes of porous materials such as zeolites. Furthermore, Cu–Im demonstrated robust recyclability, maintaining removal efficiencies of 99% for Pb(II), 90% for Mn(II), 60% for Cd(II) and 70% for Ni(II) over three adsorption cycles. Compatibility assessments using a model aquatic organism cell model, the zebrafish ZF4 cell line, revealed no significant reduction in cell viability up to 48 hours. Cu–Im's stability is benchmarked against a global spectrum of 125 MOFs using machine learning algorithms. Moreover, Cu–Im complies with seven of the twelve principles of ‘Green Chemistry’, establishing itself as a sustainable, scalable, stable and reusable solution to a pressing global challenge.

更新日期：2024-03-05

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