Reverse osmosis (RO) membranes have been widely applied in the increasingly discharged radioactive wastewater treatment. However, conventional RO membranes suffer from the issues of the limited nuclides rejections and the relatively low water permeance. In this work, a new type of RO membrane with decoration of crown ethers (15C5 and 18C6) was prepared an interfacial polymerization process to remove the radionuclide-contaminated components. Due to the special hollow structure of crown ethers (CEs) and the hydrogen bonding within the amidogen, the obtained MPD@15C5-TMC and MPD@18C6-TMC membranes exhibited smoother surfaces and thinner polyamide active layers than the pristine MPD-TMC membrane. The optimized MPD@15C5-TMC and MPD@18C6-TMC RO membranes presented excellent pure water permeances up to 2.16 and 2.91 L m h bar, and maintained high rejections towards Cs, Sr and Co, respectively. Furthermore, the membrane possessed a remarkable operational stability and an excellent anti-fouling property. These results confirmed the possibility of adopting crown ethers for RO membrane fabrication and verified their great potential for the practical application in removing radioactive elements from wastewater.

中文翻译：

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具有冠醚装饰的反渗透膜，用于增强放射性核素筛分

反渗透（RO）膜已广泛应用于排放日益增加的放射性废水处理中。然而，传统的RO膜存在核素截留率有限和水渗透性相对较低的问题。本工作采用界面聚合工艺制备了一种冠醚（15C5和18C6）装饰的新型RO膜，以去除放射性核素污染的组分。由于冠醚（CE）的特殊中空结构和酰胺内的氢键，所获得的MPD@15C5-TMC和MPD@18C6-TMC膜比原始MPD-TMC膜表现出更光滑的表面和更薄的聚酰胺活性层。优化后的 MPD@15C5-TMC 和 MPD@18C6-TMC RO 膜表现出优异的纯水渗透性，分别高达 2.16 和 2.91 L mh bar，并对 Cs、Sr 和 Co 分别保持高截留率。此外，该膜还具有显着的运行稳定性和优异的防污性能。这些结果证实了采用冠醚制造RO膜的可能性，并验证了其在去除废水中放射性元素的实际应用中的巨大潜力。