CAS Key Laboratory for Nano-Bio Interface, Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences, Suzhou, 215123, China.
State Key Laboratory of Fire Science, University of Science and Technology of China, 96 Jinzhai Road, Hefei, Anhui, 230026, China.
Environ Res. 2022 Nov;214(Pt 4):114113. doi: 10.1016/j.envres.2022.114113. Epub 2022 Aug 27.
Various articles have been written about MOFs, which are organic-inorganic polymer structures that are unique in three-dimensional porosity, crystalline structure, and their ability to adsorb cadmium ion pollutants from aqueous solutions. These materials possess active metal sites, highly porous structures, high specific surfaces, high chemical functionality, and porous topologies. It is necessary to study adsorption kinetics, isotherms, and mechanisms in order to better understand the adsorption process. Adsorption kinetics can provide information about the adsorption rate and reaction pathway of adsorbents. Adsorption isotherms analyze the possibility of absorbances based on the Gibbs equation and thermodynamic theories. Moreover, in practical applications, knowledge of the adsorption mechanism is essential for predicting adsorption reactions and designing MOFs structures. In this review, the latest suggested adsorption mechanisms, kinetics, and isotherms of MOFs-based materials for removing cadmium ions are presented. A comparison is then conducted between different MOFs and the mechanisms of cadmium ion removal. We also discuss the future role of MOFs in removing environmental contaminants. Lastly, we discuss the gap in research and limitations of MOFs as adsorbents in actual applications, and probable technology development for the development of cost-efficient and sustainable MOFs for metal ion removal.
已经有很多关于金属有机骨架（MOFs）的文章，它们是具有独特三维孔隙率、晶体结构和从水溶液中吸附镉离子污染物能力的有机-无机聚合物结构。这些材料具有活性金属位点、高多孔结构、高比表面积、高化学功能和多孔拓扑结构。为了更好地理解吸附过程，有必要研究吸附动力学、吸附等温线和机制。吸附动力学可以提供关于吸附剂吸附速率和反应途径的信息。吸附等温线基于吉布斯方程和热力学理论分析了吸附的可能性。此外，在实际应用中，了解吸附机制对于预测吸附反应和设计 MOFs 结构至关重要。在这篇综述中，介绍了用于去除镉离子的基于 MOFs 的材料的最新建议的吸附机制、动力学和等温线。然后对不同 MOFs 之间以及镉离子去除机制进行了比较。我们还讨论了 MOFs 在去除环境污染物方面的未来作用。最后，我们讨论了 MOFs 作为吸附剂在实际应用中的研究差距和局限性，以及可能的技术发展，以开发用于金属离子去除的具有成本效益和可持续性的 MOFs。
