While membranes are widely used in sustainable separations, they are mostly made from petroleum-based polymers and toxic solvents, which are not only harmful to the environment, but also pose a major risk to the safety and health of people. Aiming to enhance the sustainability of fabricating membranes, a biobased silk nanofiber (SNF) membrane is uniquely developed from natural silkworms using green solvents and pressure-assisted deposition method for dye/salt fractionation. One key feature is the replacement of traditional toxic solvents used for SNF extraction to a green solvent, deep eutectic solvent (DES) which is utilized and recycled for SNF preparation. The use of DES can effectively weaken the bonding to disintegrate the silk fibers into microfibrils without destroying the inherent properties of silk fibers. Various SNF loadings are explored to investigate the self-assembling of SNF and optimize the separation performance. The optimized SNF membrane exhibits a high separation factor of 110.7 and remarkable stability in continuously separating NaCl and rose bengal for 100 h. As compared to the conventional membranes for dye/salt fractionation, the newly developed biobased SNF membrane significantly reduces the environmental hazard by incorporating renewable polymers and green solvents, offering a promising pathway towards the establishment of a sustainable membrane industry.

中文翻译：

---

天然蚕丝纳米纤维膜的绿色制备用于有效染料/盐分馏

虽然膜广泛用于可持续分离，但它们大多由石油基聚合物和有毒溶剂制成，不仅对环境有害，而且对人们的安全和健康构成重大风险。为了提高制造膜的可持续性，生物基丝纳米纤维（SNF）膜是使用绿色溶剂和用于染料/盐分馏的压力辅助沉积方法从天然蚕中独特开发的。一个关键特点是将用于 SNF 提取的传统有毒溶剂替换为一种绿色溶剂，即低共熔溶剂 (DES)，可利用和回收用于 SNF 制备。使用DES可以有效削弱结合力，将丝纤维分解成微纤丝，而不破坏丝纤维的固有性能。探索了各种 SNF 负载量，以研究 SNF 的自组装并优化分离性能。优化后的SNF膜表现出110.7的高分离因子，并且在连续分离NaCl和玫瑰红100 h时具有显着的稳定性。与传统的染料/盐分馏膜相比，新开发的生物基SNF膜通过结合可再生聚合物和绿色溶剂，显着降低了环境危害，为建立可持续膜工业提供了一条有前途的途径。