本文详细介绍了一种由聚乙烯亚胺 (PEI) 和硫酸葡聚糖 (DS) 组成的新型纳米颗粒体系的配制和表征，用于从北美油田盐水中直接提取锂 (DLE)。在锂 (Li) 浓度为 150 ppm 的情况下，制备了不同质量比、不同浓度的 PEI 和 DS 溶液，以产生能够静电吸附溶液中锂离子的纳米颗粒体系。结果表明，纳米颗粒的最终 pH 值、粒径和电荷均受 PEI 和 DS 质量比的影响。将这种基于纳米颗粒的创新 DLE 方法集成到现有的锂处理工艺中，可以显著提高锂的回收率。
试剂。分子量约为25 kDa的多阳离子支链PEI无需进一步纯化即可使用。分子量约为500 kDa的阴离子葡聚糖硫酸钠盐直接使用。
This paper details the formulation and characterization of a novel nanoparticle system composed of polyethyleneimine (PEI) and dextran sulfate (DS) for direct lithium extraction (DLE) from bulk oilfield brines sourced from North America. Different mass ratios of solutions of PEI and DS at varied concentrations were prepared in the presence of 150-ppm lithium (Li) concentration to yield nanoparticle systems that entrap the Li ions in the solution electrostatically. Results indicated that the final pH, size, and charge of the nanoparticles were influenced by the mass ratio of PEI and DS. Integrating this innovative nanoparticle-based DLE method into existing lithium-treatment processes can enhance lithium recovery rates significantly.
Reagents. Polycationic branched PEI with a molecular weight of approximately 25 kDa was used without further purification. Anionic dextran sulfate—sodium salt with a molecular weight of approximately 500 kDa—was used as received.
