Chen Yixin, Chen Zexi, Chu Sheng
School of Materials Science and Engineering, Sun Yat-Sen University, Guangzhou 510006, China.
ACS Omega. 2025 Jan 30;10(5):4326-4335. doi: 10.1021/acsomega.4c06512. eCollection 2025 Feb 11.
Metal-organic frameworks (MOFs) hold significant potential for applications in gas adsorption and separation, catalysis, chemical sensing, and drug delivery. Zeolitic imidazolate frameworks (ZIFs) are a type of MOF composed of metal ions and imidazolate ligands, structurally similar to zeolite structures. ZIF-8, a widely studied ZIF material, is composed of zinc ions (Zn) and 2-methylimidazole as fundamental building blocks featuring unique porous structures, a high specific surface area, and excellent thermal and chemical stability. This study introduces a rapid room-temperature synthesis method for bimetallic ZIF-8 through the hydroxide double salt (HDS) precursor. Various characterization techniques confirmed that the synthesized bimetallic ZIF-8 exhibits uniform particle size and high crystallinity. Experimental results indicate that the HDS precursor provides numerous active sites, facilitating rapid nucleation and resulting in uniformly sized bimetallic ZIF-8 particles. By optimizing the ultrasonic time of HDS, the concentration of 2-methylimidazole, and the reaction time, the synthesis conditions were refined, producing bimetallic ZIF-8 particles with an average size of 135.0 nm and a minimum polydispersity index (PDI) of 0.024. Additionally, the copper ion adsorption performance was evaluated, with the synthesized bimetallic ZIF-8 showing the highest adsorption capacity of 1196.82 mg/g at pH 6, demonstrating its effectiveness in heavy metal removal.
金属有机框架材料（MOFs）在气体吸附与分离、催化、化学传感及药物递送等领域具有巨大的应用潜力。沸石咪唑酯骨架材料（ZIFs）是一种由金属离子和咪唑酯配体组成的MOF，其结构与沸石结构相似。ZIF-8是一种被广泛研究的ZIF材料，由锌离子（Zn）和2-甲基咪唑作为基本结构单元构成，具有独特的多孔结构、高比表面积以及优异的热稳定性和化学稳定性。本研究介绍了一种通过氢氧化物双盐（HDS）前驱体在室温下快速合成双金属ZIF-8的方法。各种表征技术证实，合成的双金属ZIF-8呈现出均匀的粒径和高结晶度。实验结果表明，HDS前驱体提供了大量活性位点，促进了快速成核，从而得到粒径均匀的双金属ZIF-8颗粒。通过优化HDS的超声时间、2-甲基咪唑的浓度和反应时间，对合成条件进行了优化，制备出平均粒径为135.0 nm、多分散指数（PDI）最小为0.024的双金属ZIF-8颗粒。此外，还评估了其对铜离子的吸附性能，合成的双金属ZIF-8在pH值为6时显示出最高吸附容量为1196.82 mg/g，证明了其在去除重金属方面的有效性。
