Laboratory for Advanced Nonwoven Technology, Key Laboratory of Eco-Textiles, Ministry of Education, Jiangnan University, Wuxi, 214122, P. R. China.
The International Joint Research Laboratory for Eco-Textile Technology (IJRLETT) at Jiangnan University, Wuxi, 214122, P. R. China.
Macromol Rapid Commun. 2022 Jan;43(2):e2100286. doi: 10.1002/marc.202100286. Epub 2021 Nov 15.
Microporous membrane with a hydrophobic surface, high porosity, and narrow pore size distribution is the ideal membrane distillation (MD) membrane. The electrospun membranes for MD are a new type and effective way to seawater desalination. Herein, a novel polyvinylidene fluoride (PVDF)/tetrabutylammonium chloride (TBAC) electrospun nanofiber membrane (ENMs) fabricated apply to for direct contact membrane distillation (DCMD). Combine with the spinning condition, the characteristic and content of TBAC significant effect on the multimorphology structure of nanofiber. Therefore, the porous structure and morphology of PVDF/TBAC ENMs can be well-designed by optimizing relative humidity and TBAC concentration in spinning process, three different structure nanofiber membranes are obtained. Lab-scale setup is used to test membrane separation performance. The result indicates that the ultrafine ENMs with 0.025 mol L TBAC presented a steady water flux of about 20.6 L m h and a high-efficiency salt rejection rate of over 99%. PVDF/TBAC ENMs are expected to provide a solution for development of efficient water treatment membrane.
具有疏水性表面、高孔隙率和窄孔径分布的微孔膜是理想的膜蒸馏（MD）膜。用于 MD 的静电纺丝膜是海水淡化的一种新型有效方法。本文中，通过制备一种新型聚偏氟乙烯（PVDF）/四丁基氯化铵（TBAC）静电纺纳米纤维膜（ENMs）应用于直接接触膜蒸馏（DCMD）。结合纺丝条件，TBAC 的特性和含量对纳米纤维的多形态结构有显著影响。因此，通过优化纺丝过程中的相对湿度和 TBAC 浓度，可以很好地设计 PVDF/TBAC ENMs 的多孔结构和形态，得到三种不同结构的纳米纤维膜。采用实验室规模装置测试膜分离性能。结果表明，含有 0.025molL TBAC 的超细 ENMs 具有约 20.6Lmh 的稳定水通量和超过 99%的高效盐截留率。PVDF/TBAC ENMs 有望为高效水处理膜的发展提供解决方案。
