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Dual-Bioinspired Design for Constructing Membranes with Superhydrophobicity for Direct Contact Membrane Distillation
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2018-02-12 00:00:00 , DOI: 10.1021/acs.est.7b06227 Zhigao Zhu 1 , Yuanren Liu 1 , Haoqing Hou 2 , Wenxin Shi 1 , Fangshu Qu 1 , Fuyi Cui 1 , Wei Wang 1
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2018-02-12 00:00:00 , DOI: 10.1021/acs.est.7b06227 Zhigao Zhu 1 , Yuanren Liu 1 , Haoqing Hou 2 , Wenxin Shi 1 , Fangshu Qu 1 , Fuyi Cui 1 , Wei Wang 1
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Water flux and durability are the two critical parameters that are closely associated with the practical application of membrane distillation (MD). Herein, we report a facile approach to fabricate superhydrophobic polyimide nanofibrous membranes (PI NFMs) with hierarchical structures, interconnected pores, and high porosity, which was derived from the electrospinning, dual-bioinspired design, and fluorination processes. Bioinspired adhesive based on polydopamine/polyethylenimine (PDA/PEI) composite was first linked onto membrane substrates and then assembled lotus leaf hierarchical structure by binding the negatively charged silica nanoparticles (SiO2 NPs) via electrostatic attraction. The resultant superhydrophobic PI NFMs exhibit a water contact angle of 152°, robust hot water resistance of 85 °C, and high water entry pressure of 42 kPa. Moreover, the membrane with omniphobicity presents high water flux over 31 L m–2 h–1 and high salts rejection of ∼100% as well as robust durability for treating high salinity wastewater containing typical low surface tension and dissolved contaminants (ΔT = 40 °C). Significantly, the novel dual-bioinspired method can be used as a universal tool to modify various materials with hierarchical structures, which is expected to provide more effective alternative membranes for MD and even for other selective wetting separation fields.
中文翻译：
具有双重疏水性的膜直接接触膜蒸馏的双重生物启发设计。
水通量和耐久性是与膜蒸馏（MD）的实际应用密切相关的两个关键参数。在本文中，我们报道了一种简便的方法来制造具有分层结构，相互连接的孔和高孔隙率的超疏水聚酰亚胺纳米纤维膜（PI NFM），该膜源自静电纺丝，双重生物启发设计和氟化过程。首先将基于聚多巴胺/聚乙烯亚胺（PDA / PEI）复合材料的生物启发粘合剂粘合到膜基质上，然后通过结合带负电的二氧化硅纳米颗粒（SiO 2NPs）通过静电吸引。所得的超疏水PI NFM具有152°的水接触角，85°C的坚固耐热水性和42 kPa的高进水压力。此外，具有憎水性的膜在31 L m –2 h –1的水通量下表现出较高的水通量，排盐率高达〜100％，并且对于处理典型的低表面张力和溶解性污染物（ΔT = 40）的高盐度废水具有很强的耐久性。°C）。重要的是，新颖的双重生物启发方法可以用作通用工具来修饰具有分层结构的各种材料，这有望为MD甚至其他选择性润湿分离领域提供更有效的替代膜。
更新日期：2018-02-13
中文翻译：
具有双重疏水性的膜直接接触膜蒸馏的双重生物启发设计。
水通量和耐久性是与膜蒸馏（MD）的实际应用密切相关的两个关键参数。在本文中，我们报道了一种简便的方法来制造具有分层结构，相互连接的孔和高孔隙率的超疏水聚酰亚胺纳米纤维膜（PI NFM），该膜源自静电纺丝，双重生物启发设计和氟化过程。首先将基于聚多巴胺/聚乙烯亚胺（PDA / PEI）复合材料的生物启发粘合剂粘合到膜基质上，然后通过结合带负电的二氧化硅纳米颗粒（SiO 2NPs）通过静电吸引。所得的超疏水PI NFM具有152°的水接触角，85°C的坚固耐热水性和42 kPa的高进水压力。此外，具有憎水性的膜在31 L m –2 h –1的水通量下表现出较高的水通量，排盐率高达〜100％，并且对于处理典型的低表面张力和溶解性污染物（ΔT = 40）的高盐度废水具有很强的耐久性。°C）。重要的是，新颖的双重生物启发方法可以用作通用工具来修饰具有分层结构的各种材料，这有望为MD甚至其他选择性润湿分离领域提供更有效的替代膜。
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