Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, China.
Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, China.
Sci Total Environ. 2022 Sep 15;839:156231. doi: 10.1016/j.scitotenv.2022.156231. Epub 2022 May 26.
Ag@resorcinol-formaldehyde resin (Ag@RF) core-shell nanomaterials were prepared by Stöber method, and introduced into polyamide (PA) selective layer of thin-film nanocomposite (TFN) membranes through the interfacial polymerization (IP) process. Due to the abundant hydroxyl groups on the surface and suitable particle size, Ag@RF nanoparticles (Ag@RFs) could be uniformly dispersed in the piperazine aqueous solution and participate in the IP process to precisely regulate the microstructure of the PA selective layer. The resulting "crater structure" and irregular granular structure enlarged the permeable area and contributed to the surface hydrophilicity. For the nanofiltration application, the water flux of TFN membrane modified by Ag@RFs to NaSO solution reached 150 L·m·h which was 87.5% greater than TFC, and salt rejection was maintained. The antibacterial efficiency of the prepared TFN membrane on E. coli reached 99.6% in the antibacterial experiment. In addition, due to the special structure of Ag@RFs, the TFN membrane also showed an expected slow-release capability of Ag, allowing for long-term anti-biofouling properties. This work demonstrates that Ag@RF core-shell nanoparticles with high compatibility of organic nanoparticles and antibacterial properties of Ag nanoparticles could be used as promising nanofillers for designing functional nanofiltration TFN membranes.
Ag@resorcinol-formaldehyde 树脂（Ag@RF）核壳纳米材料采用 Stöber 法制备，并通过界面聚合（IP）过程引入到薄膜复合纳滤膜（TFN）的聚酰胺（PA）选择层中。由于表面丰富的羟基和合适的粒径，Ag@RF 纳米颗粒（Ag@RFs）可以在哌嗪水溶液中均匀分散，并参与 IP 过程，从而精确调控 PA 选择层的微观结构。所得到的“火山口结构”和不规则颗粒结构增大了渗透面积，有助于提高表面亲水性。对于纳滤应用，Ag@RFs 改性的 TFN 膜对 NaSO 溶液的水通量达到 150 L·m·h，比 TFC 提高了 87.5%，同时保持了盐的截留率。在抗菌实验中，制备的 TFN 膜对大肠杆菌的抗菌效率达到 99.6%。此外，由于 Ag@RFs 的特殊结构，TFN 膜还表现出预期的 Ag 缓慢释放能力，从而具有长期的抗生物污染性能。这项工作表明，具有高有机纳米颗粒相容性和 Ag 纳米颗粒抗菌性能的 Ag@RF 核壳纳米颗粒可用作设计功能性纳滤 TFN 膜的有前途的纳米填充材料。
