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[交流] 恢复力更强的聚酯膜助力高性能反渗透海水淡化

恢复力更强的聚酯膜助力高性能反渗透海水淡化

▲ 作者:YUJIAN YAO, PINGXIA ZHANG, FEI SUN, WEN ZHANG, MENG LI, GANG SHA, ET AL.

▲ 链接:

https://www.science.org/doi/10.1126/science.adk0632

▲ 摘要:

近半个世纪以来,薄膜复合反渗透膜一直是海水淡化和水净化的黄金标准技术。聚酰胺膜具有优异的透水性和拒盐性,但也有耐氯性差、结垢倾向高和拒硼率低的缺点。

研究组通过分子设计聚酯膜复合反渗透膜来解决这些问题,使用共溶剂辅助界面聚合法使3,5-二羟基-4-甲基苯甲酸与均苯三甲酰氯反应。这种聚酯膜具有优异的透水性,对氯化钠和硼高截留,以及完全耐氯。

与聚酰胺膜相比,该膜的超光滑、低能量表面还可防止污垢和矿物结垢。通过进一步优化水盐选择性,该膜有望超越聚酰胺膜,为大大减少海水淡化的预处理步骤提供新途径。

▲ Abstract:

Thin-film composite reverse osmosis membranes have remained the gold standard technology for desalination and water purification for nearly half a century. Polyamide films offer excellent water permeability and salt rejection but also suffer from poor chlorine resistance, high fouling propensity, and low boron rejection. We addressed these issues by molecularly designing a polyester thin-film composite reverse osmosis membrane using co-solvent–assisted interfacial polymerization to react 3,5-dihydroxy-4-methylbenzoic acid with trimesoyl chloride. This polyester membrane exhibits substantial water permeability, high rejection for sodium chloride and boron, and complete resistance toward chlorine. The ultrasmooth, low-energy surface of the membrane also prevents fouling and mineral scaling compared with polyamide membranes. These membranes could increasingly challenge polyamide membranes by further optimizing water-salt selectivity, offering a path to considerably reducing pretreatment steps in desalination.

人工智能Artificial Intelligence

Fusion of memristor and digital compute-in-memory processing for energy-efficient edge computing
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