Gong Dian, Wen Binghai, Wang Lu, Zhang Hongxuan, Chen Huiling, Fan Jingrui, Li Zhi, Guo Long, Shi Guosheng, Zhu Zhigao, Liu Xing, Zeng Gaofeng
CAS Key Laboratory of Low-Carbon Conversion Science and Engineering, Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai 201210, China.
School of Chemical Engineering, University of Chinese Academy of Sciences, Beijing 100049, China.
J Am Chem Soc. 2024 Feb 7;146(5):3075-3085. doi: 10.1021/jacs.3c10051. Epub 2024 Jan 4.
Billions of populations are suffering from the supply-demand imbalance of clean water, resulting in a global sustainability crisis. Membrane desalination is a promising method to produce fresh water from saline waters. However, conventional membranes often encounter challenges related to low water permeation, negatively impacting energy efficiency and water productivity. Herein, we achieve ultrafast desalination over the newly developed alkadiyne-pyrene conjugated frameworks membrane supported on a porous copper hollow fiber. With membrane distillation, the membrane exhibits nearly complete NaCl rejection (>99.9%) and ultrahigh fluxes (∼500 L m h) from the seawater salinity-level NaCl solutions, which surpass the commercial polymeric membranes with at least 1 order of magnitude higher permeability. Experimental and theoretical investigations suggest that the large aspect ratio of membrane pores and the high evaporation area contribute to the high flux, and the graphene-like hydrophobic surface of conjugated frameworks exhibits complete salt exclusion. The simulations also confirm that the intraplanar pores of frameworks are impermeable for water and ions.
数十亿人口正遭受清洁水供需失衡之苦，这导致了一场全球可持续发展危机。膜脱盐是一种从咸水中制取淡水的有前景的方法。然而，传统膜常常面临与低水渗透相关的挑战，这对能源效率和水生产率产生负面影响。在此，我们在支撑于多孔铜中空纤维上的新开发的链二炔 - 芘共轭框架膜上实现了超快速脱盐。通过膜蒸馏，该膜对海水盐度水平的氯化钠溶液表现出近乎完全的氯化钠截留率（>99.9%）和超高通量（约500 L m⁻² h⁻¹），其渗透率比商业聚合物膜至少高一个数量级。实验和理论研究表明，膜孔的大纵横比和高蒸发面积有助于实现高通量，共轭框架的类石墨烯疏水表面表现出完全的盐分排斥。模拟结果还证实框架的平面内孔对水和离子是不可渗透的。
