Pan Yanan, Zhang Yue, Thompson Connor, Liu Guoliang, Zhang Wencai
Department of Mining and Minerals Engineering, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061, United States.
Department of Chemistry, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061, United States.
ACS Appl Mater Interfaces. 2024 Oct 9;16(40):54259-54271. doi: 10.1021/acsami.4c13253. Epub 2024 Sep 29.
Electrospun nanosorbent fibers specifically designed for efficient lithium extraction were developed, exhibiting superior physicochemical properties. These fibers were fabricated using a polyacrylonitrile/dimethylformamide matrix, with viscosity and dynamic mechanical analysis showing that optimal interactions were achieved at lower contents of layered double hydroxide. This meticulous adjustment in formulation led to the creation of lithium porous nanosorbent fibers (Li-PNFs-1). Li-PNFs-1 exhibited outstanding mechanical attributes, including a yield stress of 0.09 MPa, a tensile strength of 2.48 MPa, and an elongation at a break of 19.7%. Additionally, they demonstrated pronounced hydrophilicity and hierarchical porous architecture, which greatly favor rapid wetting kinetics and lithium adsorption. Morphologically, they exhibited uniform smoothness with a diameter averaging 546 nm, indicative of orderly crystalline growth and a dense molecular arrangement. X-ray photoelectron spectroscopy and density functional theory using Cambridge Serial Total Energy Package revealed modifications in the spatial and electronic configurations of polyacrylonitrile due to hydrogen bonding, facilitating lithium adsorption capacity up to 13.45 mg/g under optimal conditions. Besides, kinetics and isotherm showed rapid equilibrium within 60 min and confirmed the chemical and selective nature of Li uptake. These fibers demonstrated consistent adsorption performance across multiple cycles, highlighting their potential for sustainable use in industrial applications.
开发了专门用于高效锂提取的电纺纳米吸附纤维，其具有优异的物理化学性质。这些纤维是使用聚丙烯腈/二甲基甲酰胺基质制造的，粘度和动态力学分析表明，在层状双氢氧化物含量较低时可实现最佳相互作用。这种配方上的精心调整导致了锂多孔纳米吸附纤维（Li-PNFs-1）的产生。Li-PNFs-1表现出出色的机械性能，包括屈服应力为0.09MPa、拉伸强度为2.48MPa以及断裂伸长率为19.7%。此外，它们表现出明显的亲水性和分级多孔结构，这极大地有利于快速的润湿动力学和锂吸附。从形态上看，它们呈现出均匀的光滑度，平均直径为546nm，表明晶体生长有序且分子排列致密。使用剑桥序列总能量包的X射线光电子能谱和密度泛函理论表明，由于氢键作用，聚丙烯腈的空间和电子构型发生了改变，在最佳条件下锂吸附容量可达13.45mg/g。此外，动力学和等温线表明在60分钟内达到快速平衡，并证实了锂吸收的化学和选择性性质。这些纤维在多个循环中表现出一致的吸附性能，突出了它们在工业应用中可持续使用的潜力。
