State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Textiles, Donghua University, Shanghai 201620, China.
School of Textile and Clothing, Nantong University, Nantong 226019, China.
ACS Appl Mater Interfaces. 2020 Jul 15;12(28):31852-31862. doi: 10.1021/acsami.0c08504. Epub 2020 Jul 6.
Creating a desirable porous membrane with high-flux and energy-saving properties for the purification of water containing submicron-sized contaminants, especially pathogenic microbes, is of great significance, yet a great challenge. Herein, we demonstrate a facile methodology to construct an innovative membrane with continuous cellulose Voronoi-nanonet structures nonsolvent-induced phase separation. This approach enables cellulose Voronoi nanonets to tightly weld with electrospun nanofibrous substrates by controlling the solvent-nonsolvent mutual diffusion process. The resultant membranes exhibit integrated properties of small pore size (0.23 μm), high porosity (90.7%), good interconnectivity, and ultrathin thickness (∼600 nm, 2 orders of magnitude thinner than the conventional microfiltration membrane). As a result, the prepared membranes can effectively intercept submicron particles (∼0.3 μm) with robust rejection efficiency (>99.80%) and ultrahigh permeation flux (maximum of 8834 L m h) under an extremely low driving pressure (≤20 kPa). More importantly, prominent bacterial rejection efficiency with a log reduction value (LRV) of 8.0 (overcoming the previous limitation of LRV <7) and outstanding antifouling function are also achieved for the membranes. The successful fabrication of such a versatile membrane may provide new insights into the development of next-generation high-performance separation materials for various applications.
为了净化含有亚微米级污染物（特别是致病微生物）的水，制备具有高通量和节能特性的理想多孔膜具有重要意义，但这也是一个巨大的挑战。在此，我们展示了一种通过非溶剂诱导相分离构建具有连续纤维素 Voronoi 纳米网结构的创新膜的简便方法。该方法通过控制溶剂-非溶剂相互扩散过程，使纤维素 Voronoi 纳米网能够与静电纺纳米纤维基底紧密焊接。所得膜具有小孔径（0.23 μm）、高孔隙率（90.7%）、良好的连通性和超薄厚度（约 600nm，比传统微滤膜薄 2 个数量级）等综合特性。因此，所制备的膜可以在极低的驱动压力（≤20kPa）下有效截留亚微米颗粒（约 0.3μm），具有强大的截留效率（>99.80%）和超高渗透通量（最大 8834Lm h）。更重要的是，该膜还实现了突出的细菌截留效率（LRV 为 8.0）和出色的抗污染功能（超过之前 LRV<7 的限制）。这种多功能膜的成功制备可能为开发用于各种应用的下一代高性能分离材料提供新的思路。
