Formation and characterization of polytetrafluoroethylene nanofiber membranes for vacuum membrane distillation
Formation and characterization of polytetrafluoroethylene nanofiber membranes for vacuum membrane distillation
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DOI：
10.1016/j.memsci.2013.11.027
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发表时间：
2014-03
影响因子：
9.5
通讯作者：
Tao Zhou;Yongyi Yao;Ruili Xiang;Yurong Wu
中科院分区：
文献类型：
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作者：
Tao Zhou;Yongyi Yao;Ruili Xiang;Yurong Wu
以聚四氟乙烯/聚乙烯醇复合膜为前驱体，采用烧结法制备了膜蒸馏用聚四氟乙烯复合膜。研究了烧结温度和时间对膜形貌和性能的影响。通过接触角、红外光谱和扫描电镜对膜进行表征，观察纤维在烧结过程中的结构演变。在适当的条件下形成独特的念珠状结构。讨论了纤维形态与膜的疏水性、机械强度和孔隙率的关系。研究了膜厚度对液体入口压力的影响，以确保膜在真空条件下可用。此外，膜在真空膜蒸馏配置进行了测试。通过纯水通量和脱盐率的测定，评价了膜的渗透性能和分离性能。
The polytetrafluoroethylene nanofiber membranes for membrane distillation were prepared by sintering the precursor electrospun polytetrafluoroethylene/polyvinyl alcohol composite membranes. The effects of sintering temperature and time on the morphology and properties of the prepared membranes were investigated. The prepared membranes were characterized by contact angles, IR and SEM to observe the structure evolution of the fibers during the sintering process. A unique moniliform structure was formed in proper conditions. The relationship between fiber morphology and membrane hydrophobicity, mechanical strength and porosity were discussed. The effect of membrane thickness on the liquid entry pressure was also studied to make sure the membrane was available in vacuum conditions. Moreover, membrane was tested in vacuum membrane distillation configuration. The pure water flux and salt rejection were tested to evaluate the membrane permeability and separation property.