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Optimizing stretching conditions in fabrication of PTFE hollow fiber membrane for performance improvement in membrane distillation
Journal of Membrane Science ( IF 9.5 ) Pub Date : 2018-03-01 , DOI: 10.1016/j.memsci.2017.12.070 Kuiling Li , Yong Zhang , Lili Xu , Fanfu Zeng , Deyin Hou , Jun Wang
Journal of Membrane Science ( IF 9.5 ) Pub Date : 2018-03-01 , DOI: 10.1016/j.memsci.2017.12.070 Kuiling Li , Yong Zhang , Lili Xu , Fanfu Zeng , Deyin Hou , Jun Wang
Abstract PTFE is one of the most approved hydrophobic materials for MD membranes. However, PTFE membrane was researched and applied on MD insufficiently due to its complex fabrication process. In this work, stretching conditions were comprehensively investigated to form a membrane with high flux and salt rejection. It was found that stretching led to increased cracks at an early stage, and turned to lead to the elongation of fibrils and physical dimension shrinkage of hollow fibers. A porosity prediction model was established to evaluate the improvement of porosity. It was found that a low stretching temperature was helpful for pore size control and hence a relative high stretching ratio can be carried out to achieve a higher porosity. Therefore high flux and rejection was achieved due to the higher porosity and well controlled pore size. Stretching rate of 30%/s gave rise to the most concentrated pore size distribution. NaCl rejection rate was high up to 99.99% for the membrane fabricated at a stretching ratio of 2.4 and a stretching temperature of 40 °C.
中文翻译:
优化PTFE中空纤维膜制备拉伸条件以提高膜蒸馏性能
摘要 PTFE 是最被认可的用于 MD 膜的疏水材料之一。然而,由于制备工艺复杂,聚四氟乙烯膜在MD上的研究和应用不足。在这项工作中,全面研究了拉伸条件以形成具有高通量和盐截留率的膜。研究发现,拉伸导致早期裂纹增加,进而导致原纤伸长和中空纤维物理尺寸收缩。建立孔隙度预测模型来评价孔隙度的改善情况。发现低拉伸温度有利于孔径控制,因此可以进行相对高的拉伸比以获得更高的孔隙率。因此,由于更高的孔隙率和良好控制的孔径,实现了高通量和截留率。30%/s 的拉伸速率产生最集中的孔径分布。在拉伸比为 2.4 和拉伸温度为 40 °C 时制备的膜的 NaCl 截留率高达 99.99%。
更新日期:2018-03-01
中文翻译:
优化PTFE中空纤维膜制备拉伸条件以提高膜蒸馏性能
摘要 PTFE 是最被认可的用于 MD 膜的疏水材料之一。然而,由于制备工艺复杂,聚四氟乙烯膜在MD上的研究和应用不足。在这项工作中,全面研究了拉伸条件以形成具有高通量和盐截留率的膜。研究发现,拉伸导致早期裂纹增加,进而导致原纤伸长和中空纤维物理尺寸收缩。建立孔隙度预测模型来评价孔隙度的改善情况。发现低拉伸温度有利于孔径控制,因此可以进行相对高的拉伸比以获得更高的孔隙率。因此,由于更高的孔隙率和良好控制的孔径,实现了高通量和截留率。30%/s 的拉伸速率产生最集中的孔径分布。在拉伸比为 2.4 和拉伸温度为 40 °C 时制备的膜的 NaCl 截留率高达 99.99%。