Yuan Furong, Gao Qifeng, Lv Zixiao, Zhang Yaoling, Liu Xin, Peng Jiaoyu, Li Zhan
Key Laboratory of Green and High-end Utilization of Salt Lake Resources, Qinghai Engineering and Technology Research Center of Comprehensive Utilization of Salt Lake Resources, Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining 810008, China.
Qinghai Engineering and Technology Research Center of Comprehensive Utilization of Salt Lake Resources, Xining 810008, China.
Nano Lett. 2024 Nov 13;24(45):14346-14354. doi: 10.1021/acs.nanolett.4c04040. Epub 2024 Oct 29.
Efficient lithium extraction from salt lakes is essential for a sustainable resource supply. This study tackles the challenge of separating Li from Mg in complex brines by innovatively integrating two-dimensional (2D) graphene oxide (GO) with bimetallic metal-organic frameworks (MOFs). Zn and Co ions are confined within GO interlayers through an in situ synthesis, forming a 2D Zn-Co MOFs/GO membrane (Zn-Co-GOM). This design exploits the unique advantages of bimetallic MOFs, including enhanced structural stability and superior ion separation capabilities due to the synergistic effects of Zn and Co. The Zn-Co-GOM demonstrates an impressive separation factor of 191 for Li over Mg, significantly surpassing traditional membranes. This exceptional selectivity is achieved through a combination of size exclusion effects and ion transport energy barriers. Our approach not only enhances the practical application of membrane technology for lithium extraction from salt lakes but also provides valuable insights into the underlying separation mechanisms.
从盐湖中高效提取锂对于可持续的资源供应至关重要。本研究通过创新性地将二维（2D）氧化石墨烯（GO）与双金属金属有机框架（MOF）相结合，应对了在复杂卤水中分离锂和镁的挑战。锌离子和钴离子通过原位合成被限制在氧化石墨烯层间，形成二维锌 - 钴金属有机框架/氧化石墨烯膜（Zn - Co - GOM）。这种设计利用了双金属金属有机框架的独特优势，包括由于锌和钴的协同效应而增强的结构稳定性和卓越的离子分离能力。Zn - Co - GOM对锂相对于镁的分离因子高达191，令人印象深刻，显著超过传统膜。这种优异的选择性是通过尺寸排阻效应和离子传输能垒的共同作用实现的。我们的方法不仅增强了膜技术从盐湖中提取锂的实际应用，还为潜在的分离机制提供了有价值的见解。
