Innovation Platform of Intelligent and Energy-Saving Textiles, School of Textile Science and Engineering, Tiangong University, Tianjin 300387, China; State Key Laboratory of Separation Membranes and Membrane Processes, Tiangong University, Tianjin 300387, China.
Innovation Platform of Intelligent and Energy-Saving Textiles, School of Textile Science and Engineering, Tiangong University, Tianjin 300387, China.
Environ Res. 2020 Jul;186:109494. doi: 10.1016/j.envres.2020.109494. Epub 2020 Apr 8.
Inspired by fish scales, this study prepares a thermo-responsive underwater oleophobic PNIPAM/PAN/TiO nanofibrous membranes by traditional electrospinning technique using poly-N-isopropylacrylamide (PNIPAM) and polyacrylonitrile (PAN). Thermal properties, mechanical properties, surface chemical composition, wettability, photocatalysis, and oil/water separation of PNIPAM/PAN/TiO membrane are explored compared to pure PNIPAM membrane. Result reveals that PAN/TiO compounds make PNIPAM membrane with a smaller fiber diameter of 141 nm and high tensile stress of 7.4 MPa, and also decompose 98% of rhodamine B after UV light radiation. This bioinspired design structure endows the membrane with superhydrophilicity with a low water contact angle, and underwater superoleophobicity with a high oil contact angle of 157° (petroleum ether) and 151° (dichloromethane). This membrane can efficiency separate oil/water mixture with a high separation efficiency. Moreover, the resultant PNIPAM/PAN/TiO membrane has the bionic fish scale structure, and has wettability respond at lower critical solution temperature making the water flux decreased from 10013 ± 367 L m·h to 7713 ± 324 L m·h, and thus has a potential to be used in purification of reclaimed water and separation of oil from water.
受鱼鳞启发，本研究采用传统静电纺丝技术，以聚 N-异丙基丙烯酰胺（PNIPAM）和聚丙烯腈（PAN）为原料，制备了一种温敏水下疏油 PNIPAM/PAN/TiO 纳米纤维膜。与纯 PNIPAM 膜相比，研究了 PNIPAM/PAN/TiO 膜的热性能、力学性能、表面化学成分、润湿性、光催化性能和油水分离性能。结果表明，PAN/TiO 化合物使 PNIPAM 膜的纤维直径减小到 141nm，拉伸应力提高到 7.4MPa，且罗丹明 B 在紫外光照射下分解率达到 98%。这种仿生设计结构使膜具有超亲水性（低水接触角）和水下超疏油性（石油醚的油接触角为 157°，二氯甲烷的油接触角为 151°）。该膜可高效分离油水混合物，分离效率高。此外，所得的 PNIPAM/PAN/TiO 膜具有仿生鱼鳞结构，在较低的临界溶液温度下具有润湿性响应，使水通量从 10013±367L·m·h 降低到 7713±324L·m·h，因此有望用于再生水的净化和油水分离。
