摘要
Charged cellulose in nonwoven leads to nano-sized pores and high charged density of CNW. • Donnan exclusion and Debye-length-related electrostatic regulation facilitate Li+ transport and suppress Mg2+ in CNW. • CNW in FO delivers Li + permeation of 920 g·h −1 ·m −2 with Li + /Mg 2+ selectivity of 3.24. • CNW remains stable at wide pH, high salinity, and long-term operation. With the rapid growth of the lithium battery industry, global lithium demand continues to increase, making efficient and selective lithium extraction from salt lake brines increasingly important. In this context, the performance of ion-selective separation membranes is crucial, with surface charge and porous transport structure being widely recognized as key factors influencing separation efficiency. Herein, this study develops a scalable charged cellulose-inserted nonwoven composite membrane (CNW) by embedding charged cellulose molecules into a nonwoven fabric through a simple vacuum-assisted impregnation process. The CNW possesses interconnected porous transport pathways (porosity of 66%) and a negatively charged interface (zeta potential of −49 mV), which support the selective ion transport through the synergistic effects of Donnan exclusion and Debye-length-related electrostatic regulation. Under the optimal conditions, the permeation rates of Li + and Mg 2+ reach 920 and 284 g·h −1 ·m −2 , respectively, while the Li + /Mg 2+ selectivity of 3.24, approximately 3 times higher than that of the original cellulose membrane, under osmotically driven FO operation. Moreover, the membrane maintains stable separation performance and structural integrity during long-term operation. These findings demonstrate that the synergistic regulation of charged interfaces and porous transport pathways provides a promising strategy for scalable and sustainable lithium extraction from salt-lake brines. Download: Download high-res image (187KB) Download: Download full-size image
危险品化学品经营许可证（带存储）