The digestion/regeneration of metal-organic frameworks (MOFs) has important applications for catalysis, drug delivery, environmental decontamination, and energy storage, among other applications. However, research in this direction is limited and very challenging. Here, we develop a facile method to digest and regenerate a series of zirconium-based metal-organic frameworks (Zr-MOFs) by bicarbonate or carbonate salts. As an example, UiO-66 demonstrates well the mechanism of reversible digestion/regeneration processes. By analyzing the digested zirconium species via X-ray diffraction, Fourier transform infrared spectroscopy and Raman scattering spectroscopy, a digestion mechanism based on the formation of dissoluble complexes [Zr₂(OH)₂(CO₃)₄]²⁻ is proposed. Impressively, ultrafine Pd nanoparticles can be extracted from Pd@PCN-224 via this strategy. This work, thus, may provide new insight for the development of renewable MOFs and their practical applications.

金属有机框架 (MOF) 的消化/再生在催化、药物输送、环境净化和能量储存等方面具有重要应用。然而，这方面的研究是有限的，而且非常具有挑战性。在这里，我们开发了一种简便的方法，通过碳酸氢盐或碳酸盐消化和再生一系列锆基金属有机骨架 (Zr-MOF)。例如，UiO-66 很好地展示了可逆消化/再生过程的机制。通过 X 射线衍射、傅立叶变换红外光谱和拉曼散射光谱分析消解的锆物质，基于可溶性络合物 [Zr ₂ (OH) ₂ (CO ₃ ) _{4形成的消解机制}] ²⁻提出。令人印象深刻的是，通过这种策略可以从 Pd@PCN-224 中提取超细 Pd 纳米粒子。因此，这项工作可能为可再生 MOF 的开发及其实际应用提供新的见解。