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Emerging investigator series: engineering membrane distillation with nanofabrication: design, performance and mechanisms
Environmental Science: Water Research & Technology ( IF 3.5 ) Pub Date : 2020-05-11 , DOI: 10.1039/d0ew00100g Rui Huang 1, 2, 3, 4, 5 , Zhiquan Liu 6, 7, 8, 9, 10 , Yun Chul Woo 11, 12, 13, 14, 15 , Wenhai Luo 16, 17, 18, 19, 20 , Stephen R. Gray 20, 21, 22, 23 , Ming Xie 1, 2, 3, 4
Environmental Science: Water Research & Technology ( IF 3.5 ) Pub Date : 2020-05-11 , DOI: 10.1039/d0ew00100g Rui Huang 1, 2, 3, 4, 5 , Zhiquan Liu 6, 7, 8, 9, 10 , Yun Chul Woo 11, 12, 13, 14, 15 , Wenhai Luo 16, 17, 18, 19, 20 , Stephen R. Gray 20, 21, 22, 23 , Ming Xie 1, 2, 3, 4
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Anti-fouling and durability are two important parameters that are closely associated with the development and deployment of membrane distillation (MD). In this study, we reported a nanoimprinted, omniphobic polytetrafluoroethylene (PTFE) membrane with a hierarchical rough structure for the MD process. A highly ordered, circular surface pattern was first imparted to a PTFE membrane substrate via a nanoimprint technique. An ultrathin TiO2 layer was deposited onto the nanoimprinted membrane to create a spherical hierarchical rough structure via atomic layer deposition as well as an initiator for chemical fluorination of the membrane. The resultant, nanofabricated membrane exhibited a water contact angle of 155° and a contact angle above 100° against a range of low surface tension liquids. In addition, the nanofabricated membrane displayed a high and stable water flux of around 34 L m−2 h−1 for more than 24 hours, and nearly complete salt rejection with the presence of surfactants. Most importantly, the water flux recovery rate of the resultant membrane was more than 91.3% after three fouling–cleaning cycles, demonstrating excellent fouling reversibility. The new strategy proposed here that combines the nanoimprint technique and superhydrophobic modification sheds light on developing MD membranes with considerable durability and anti-fouling performance.
中文翻译：
新兴研究者系列：纳米制造的工程膜蒸馏：设计，性能和机理
防污性和耐久性是与膜蒸馏（MD）的开发和部署密切相关的两个重要参数。在这项研究中，我们报道了一种纳米压印，全疏水的聚四氟乙烯（PTFE）膜，该膜具有用于MD过程的分级粗糙结构。首先通过纳米压印技术将高度有序的圆形表面图案赋予PTFE膜基材。将超薄TiO 2层沉积到纳米压印膜上，以通过原子层沉积以及膜化学氟化的引发剂。所得的纳米加工膜对一系列低表面张力液体表现出155°的水接触角和100°以上的接触角。另外，纳米加工膜显示出高且稳定的水通量，约为34 L m -2 h -1超过24小时，并在表面活性剂存在下几乎完全除盐。最重要的是，经过三个污垢清洗循环后，所得膜的水通量回收率超过91.3％，这证明了优异的污垢可逆性。这里提出的将纳米压印技术和超疏水改性相结合的新策略为具有显着耐用性和防污性能的MD膜的开发提供了启示。
更新日期：2020-07-02
中文翻译：
新兴研究者系列：纳米制造的工程膜蒸馏：设计，性能和机理
防污性和耐久性是与膜蒸馏（MD）的开发和部署密切相关的两个重要参数。在这项研究中，我们报道了一种纳米压印，全疏水的聚四氟乙烯（PTFE）膜，该膜具有用于MD过程的分级粗糙结构。首先通过纳米压印技术将高度有序的圆形表面图案赋予PTFE膜基材。将超薄TiO 2层沉积到纳米压印膜上，以通过原子层沉积以及膜化学氟化的引发剂。所得的纳米加工膜对一系列低表面张力液体表现出155°的水接触角和100°以上的接触角。另外，纳米加工膜显示出高且稳定的水通量，约为34 L m -2 h -1超过24小时，并在表面活性剂存在下几乎完全除盐。最重要的是，经过三个污垢清洗循环后，所得膜的水通量回收率超过91.3％，这证明了优异的污垢可逆性。这里提出的将纳米压印技术和超疏水改性相结合的新策略为具有显着耐用性和防污性能的MD膜的开发提供了启示。
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