Separation and Purification Technology ( IF 8.1 ) Pub Date : 2023-11-17 , DOI: 10.1016/j.seppur.2023.125766
Chunguang Hou , Zhiguang Pang , Songchen Xie , Ziyun Yang , Ngie Hing Wong , Jaka Sunarso , Yuelian Peng
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Polyvinylpyrrolidone (PVP) is a widely used water-soluble polymer that can act as a pore-forming additive in ultrafiltration membrane preparation. Here, the PVDF hollow fiber membranes were prepared via the c-TIPS method by introducing PVP to the casting solution. The dual PVP roles in the membrane fabrication process enabled the production of PVDF hollow fiber membranes composed of bicontinuous structures. The PVP inhibited PVDF crystallization and then reduced the gelation temperature of the casting solution. They grew faster at coarsening, allowing greater growth of pores, and the formation of gap-connected pores and interlinked pores, which formed the bicontinuous structure. The PVP also acted as an effective pore-forming agent, giving porous outer surface. PVP can be removed almost completely from the membrane and did not lead to the wetting of PVDF membranes. Therefore, the synthesized PVDF membrane under optimal conditions could be used in the DCMD process with a maximum vapor flux of 18 ± 3 kg m−2 h−1, the pure water flux in ultrafiltration process reached 335.91 L m−2 h−1 bar−1, and the tensile stress was 5.8 MPa. This work presents a new route for preparing PVDF hollow fiber membranes using conventional spinning equipment with simple operation and moderately elevated temperature that is scalable to industry level.
中文翻译:
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PVP 的双重作用,通过复杂的热致相分离 (c-TIPS) 制备具有双连续结构的 PVDF 中空纤维膜
聚乙烯吡咯烷酮(PVP)是一种广泛使用的水溶性聚合物,可作为超滤膜制备中的成孔添加剂。在这里,通过将 PVP 引入到浇铸溶液中,通过c-TIPS 方法制备了 PVDF 中空纤维膜。PVP 在膜制造过程中的双重作用使得能够生产由双连续结构组成的 PVDF 中空纤维膜。PVP抑制PVDF结晶,进而降低浇铸溶液的胶凝温度。它们在粗化时生长得更快,使得孔隙更大地生长,并形成间隙连接的孔隙和连通的孔隙,从而形成双连续结构。PVP 还充当有效的成孔剂,赋予多孔的外表面。PVP 几乎可以从膜上完全去除,并且不会导致 PVDF 膜润湿。因此,最佳条件下合成的PVDF膜可用于DCMD工艺,最大蒸汽通量为18±3 kg m -2 h -1,超滤工艺纯水通量达到335.91 L m -2 h -1 bar -1,拉伸应力为5.8MPa。这项工作提出了一种使用传统纺丝设备制备PVDF中空纤维膜的新路线,该设备操作简单,温度适度升高,可扩展到工业水平。