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Non-solvent Flux Augmentation of an LDPE-Coated Polytetrafluoroethylene Hollow Fiber Membrane for Direct Contact Membrane Distillation
ACS Omega ( IF 3.7 ) Pub Date : 2021-09-24 , DOI: 10.1021/acsomega.1c02887 Mohamad Razif Mohd Ramli 1 , Abdul Latif Ahmad 1 , Ebenezer Idowu Oluwasola 1, 2 , Choe Peng Leo 1
ACS Omega ( IF 3.7 ) Pub Date : 2021-09-24 , DOI: 10.1021/acsomega.1c02887 Mohamad Razif Mohd Ramli 1 , Abdul Latif Ahmad 1 , Ebenezer Idowu Oluwasola 1, 2 , Choe Peng Leo 1
Affiliation
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Membrane distillation (MD) is a thermal technology for the desalination process that requires a hydrophobic microporous membrane to ensure that the membrane can maintain the liquid–vapor interface. This work aims to enhance the water permeation flux of the previously coated membrane by modifying the surface of the polytetrafluoroethylene hollow fiber (PTFE HF) membrane with a selected non-solvent such as acetone, cyclohexanone, and ethanol in low-density polyethylene as a polymeric coating solution. However, the modification using acetone and cyclohexanone solvents was unsuccessful because a reduction in membrane hydrophobicity was observed. The modified PTFE HF membrane with ethanol content exhibits high wetting resistance with a high water contact angle, which can withstand pore wetting during the direct contact MD process. Since MD operates under a lower operating temperature range (50–90 °C) compared to the conventional distillation, we herein demonstrated that higher flux could be obtained at 7.26 L m–2 h–1. Thus, the process is economically feasible because of lower energy consumption. Performance evaluation of the modified PTFE HF membrane showed a high rejection of 99.69% for sodium chloride (NaCl), indicating that the coated membrane preferentially allowed only water vapor to pass through.
中文翻译：
用于直接接触膜蒸馏的 LDPE 涂层聚四氟乙烯中空纤维膜的非溶剂通量增加
膜蒸馏 (MD) 是一种用于脱盐过程的热技术，需要疏水性微孔膜以确保膜能够保持液-气界面。本工作旨在通过在低密度聚乙烯中使用选定的非溶剂如丙酮、环己酮和乙醇对聚四氟乙烯中空纤维 (PTFE HF) 膜的表面进行改性来提高先前涂层膜的水渗透通量作为聚合物。涂层溶液。然而，使用丙酮和环己酮溶剂的改性不成功，因为观察到膜疏水性降低。含有乙醇的改性 PTFE HF 膜表现出高抗润湿性和高水接触角，可以承受直接接触 MD 过程中的孔隙润湿。–2小时–1。因此，由于能耗较低，该过程在经济上是可行的。改性 PTFE HF 膜的性能评估显示对氯化钠 (NaCl) 的截留率高达 99.69%，表明涂层膜优先只允许水蒸气通过。
更新日期：2021-10-06
中文翻译：
用于直接接触膜蒸馏的 LDPE 涂层聚四氟乙烯中空纤维膜的非溶剂通量增加
膜蒸馏 (MD) 是一种用于脱盐过程的热技术，需要疏水性微孔膜以确保膜能够保持液-气界面。本工作旨在通过在低密度聚乙烯中使用选定的非溶剂如丙酮、环己酮和乙醇对聚四氟乙烯中空纤维 (PTFE HF) 膜的表面进行改性来提高先前涂层膜的水渗透通量作为聚合物。涂层溶液。然而，使用丙酮和环己酮溶剂的改性不成功，因为观察到膜疏水性降低。含有乙醇的改性 PTFE HF 膜表现出高抗润湿性和高水接触角，可以承受直接接触 MD 过程中的孔隙润湿。–2小时–1。因此，由于能耗较低，该过程在经济上是可行的。改性 PTFE HF 膜的性能评估显示对氯化钠 (NaCl) 的截留率高达 99.69%，表明涂层膜优先只允许水蒸气通过。
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