Zhou Wen, Zhang Xinxin, Gong Xiaobao, Ding Mingle, Yu Jianyong, Zhang Shichao, Ding Bin
Innovation Center for Textile Science and Technology, College of Textiles, Donghua University, Shanghai 201620, China.
ACS Appl Mater Interfaces. 2022 Aug 3;14(30):35287-35296. doi: 10.1021/acsami.2c12061. Epub 2022 Jul 22.
Seawater desalination is a promising and sustainable solution to alleviate freshwater scarcity; however, most existing desalination membranes suffer from poor channel interconnectivity and toxic solvent processing and encounter a tradeoff dilemma of salt rejection and water flux. Herein, we report a unique and facile one-step green solvent/nonsolvent spinning methodology to assemble environmentally friendly polyamide nanofiber membranes with a precisely designed interconnective/stable channel structure and surface anti-wettability for seawater desalination. Direct electrospinning without any post-treatments via in situ introduction of fluorinated chemicals enables highly interconnective amphiphobic channels within polyamide membranes, and the incorporation of nonsolvent (diacetone alcohol) into polyamide/solvent (ethanol) spinning solutions endows the green alcohol-based polyamide membranes with a stable bonding structure and small pore size. The resultant green solvent/nonsolvent-spun polyamide nanofiber membranes show impressive liquid entry pressure (120.5 kPa) and vapor permeation (12.5 kg m d), achieving robust seawater desalination performance with a salt rejection of 99.97% and permeate flux of 47.4 kg m h. The facile one-step solvent/nonsolvent spinning strategy, highly interconnective amphiphobic channels, and green solvent-based environmental friendliness in this work can open opportunities for future polyamide membranes for practical applications in water purification.
海水淡化是缓解淡水短缺的一种有前景且可持续的解决方案；然而，大多数现有的脱盐膜存在通道互连性差和有毒溶剂处理问题，并且在盐截留率和水通量之间面临权衡困境。在此，我们报道了一种独特且简便的一步绿色溶剂/非溶剂纺丝方法，用于组装具有精确设计的互连/稳定通道结构和表面抗润湿性的环境友好型聚酰胺纳米纤维膜，用于海水淡化。通过原位引入氟化化学品直接进行静电纺丝而无需任何后处理，能够在聚酰胺膜内形成高度互连的两亲疏水性通道，并且将非溶剂（双丙酮醇）掺入聚酰胺/溶剂（乙醇）纺丝溶液中，赋予了绿色醇基聚酰胺膜稳定的键合结构和小孔径。所得的绿色溶剂/非溶剂纺聚酰胺纳米纤维膜表现出令人印象深刻的液体进入压力（120.5 kPa）和蒸汽渗透性能（12.5 kg m⁻² d⁻¹），实现了强大的海水淡化性能，盐截留率为99.97%，渗透通量为47.4 kg m⁻² h⁻¹。本工作中简便的一步溶剂/非溶剂纺丝策略、高度互连的两亲疏水性通道以及基于绿色溶剂的环境友好性，可为未来聚酰胺膜在水净化实际应用中创造机会。
