Preparation of Polysulfone/Zeolitic Imidazolate Framework-8@Potassium Copper Hexacyanoferrate Composite Membranes for Selective Extraction of Rubidium

作者：Peijun Liu, Guan‐Ping Jin, Yili Fu, Bolin Liu, Xu Zhang, Huaitao Jiang · 发表于：Industrial & Engineering Chemistry Research · 年份：2025 · DOI：10.1021/acs.iecr.4c04332 · 被引用次数：5 · 研究领域：Chemical Synthesis and Characterization、Extraction and Separation Processes、Metal-Organic Frameworks: Synthesis and Applications

The development of extraction methods for rare and valuable rubidium (Rb) from the aqueous phase remains a challenge today. In this work, based on the promising physicochemical properties of polysulfone (PSF), the strong binding ability of zeolitic imidazolate framework-8 (ZIF-8) to Cu 2+, as well as the excellent adsorption ability of potassium copper hexacyanoferrate (KCuFC) toward Rb +, a novel PSF/ZIF-8@KCuFC composite membrane was developed. The prepared composite membrane was applicable for efficient separation of Rb + from the aqueous solution. The theoretical maximum adsorption capacity of Rb + could reach 204.45 mg/g at 45 °C. The composite membrane possessed remarkable desorption and regeneration properties, which were demonstrated by a 0.5 mol/L NH 4 Cl/HCl solution and six adsorption/desorption cycles, respectively. Furthermore, the PSF/ZIF-8@KCuFC composite membrane could still uptake Rb + with good effect from actual salt lake brine, and the recovery efficiency was maintained at about 38% during ten adsorption/desorption processes.