School of Civil & Architecture Engineering, Xi'an Technological University, Xi'an, 710021, China.
School of Civil & Architecture Engineering, Xi'an Technological University, Xi'an, 710021, China.
Chemosphere. 2020 Jun;248:125956. doi: 10.1016/j.chemosphere.2020.125956. Epub 2020 Jan 28.
Biofouling and organic fouling are major obstacles for polymeric membranes during application. In this work, zeolitic imidazolate framework-8@polydopamine (ZIF-8@PDA) nanoparticles were prepared by an aqueous synthesis strategy and incorporated into the polyamide (PA) selective layer to synthesize thin film nanocomposite membrane (TFN) during interfacial polymerization. The permeability and selectivity of the composite membrane were simultaneously improved with the introduction of ZIF-8@PDA. The water permeability of the TFN membrane increased to 3.74 ± 0.19 L/(m2·h·bar), which is 43.8% higher than that of the control membrane. Besides, the rejection of TFN membrane to sodium chloride is 98.68 ± 0.13%, which shows 0.99% increment than the unmodified membrane. Moreover, organic fouling and biofouling of the TFN membrane were also alleviated thanks to the introduction of the hydrophilic ZIF-8@PDA. The short-term filtration results indicate the performance of the TFN membrane is stable during operation.
生物污染和有机污染是聚合物膜在应用过程中的主要障碍。在这项工作中，通过水相合成策略制备了沸石咪唑酯骨架-8@聚多巴胺（ZIF-8@PDA）纳米粒子，并将其掺入聚酰胺（PA）选择性层中，在界面聚合过程中合成了薄膜纳米复合膜（TFN）。引入 ZIF-8@PDA 同时提高了复合膜的渗透性和选择性。复合膜的水透过率增加到 3.74 ± 0.19 L/（m2·h·bar），比对照膜高 43.8%。此外，TFN 膜对氯化钠的截留率为 98.68 ± 0.13%，比未改性膜高 0.99%。此外，由于引入了亲水性 ZIF-8@PDA，TFN 膜的有机污染和生物污染也得到了缓解。短期过滤结果表明，TFN 膜在运行过程中的性能稳定。
