文献类型：期刊文献

英文题名：Cyclodextrin-Embedded Nanofilms With "Knot-Thread" Structure for Efficient Lithium Extraction

作者：Zhou, Linlong[1,2];Gu, Shuyun[1,2];Li, Siyao[1,2];Xu, Zhi[1,2]

机构：[1]East China Univ Sci & Technol, Sch Chem Engn, State Key Lab Chem Engn, 130 Meilong Rd, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Sch Chem Engn, Shanghai Key Lab Multiphase Mat Chem Engn, 130 Meilong Rd, Shanghai 200237, Peoples R China

年份：2025

卷号：35

期号：43

外文期刊名：ADVANCED FUNCTIONAL MATERIALS

收录：;EI(收录号：20251918398717);WOS:【SCI-EXPANDED(收录号:WOS:001483200900001)】；

基金：This work was financially supported by the National Key Research & Development Program of China (Grant No. 2024YFB3815600), National Natural Science Foundation of China (Grant No. 22308099, 22478109, and 23FAA02066), the open foundation of State Key Laboratory of Chemical Engineering (No. SKL- ChE-23B01).

语种：英文

外文关键词：cyclodextrin; Interfacial polymerization; lithium extractions; polyamide nanofilms; sieving membranes

摘要：Membrane separation technology holds large potential for sustainable lithium extraction from salt lakes. Accurate lithium and magnesium separation is determinative of the lithium extraction efficiency. However, it still poses a huge hurdle for conventional nanofiltration membranes to break through the limited permeance and poor Mg2+/Li+ selectivity. Here, a new monomer cyclodextrin-pentaethylenehexamine (CD-PEHA) containing CD cavity as knot and long amino chains as thread is synthesized as a building block to fabricate CD-embedded polyamide nanofilms via interfacial polymerization. The protonated amino groups along the thread and the annular shape of CD cavity intensify the free volume and electropositivity of the CD-embedded membrane simultaneously, which is favorable for Mg2+/Li+ separation. The optimum CD-embedded membranes feature a remarkable Mg2+/Li+ separation selectivity of 51.8 and a high permeance of 10.8 L m(-2) h(-1) bar(-1), which is preferable than most of the state-of-the-art membranes for lithium extraction. In addition, high-purity Li2CO3 product is obtained via a three-stage nanofiltration process from simulated salt-lake brine. This tailored molecular weaving strategy may herald a promising outlook for the development of advanced membranes for lithium extraction.