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Metal–Organic Framework Nanosheets for Thin-Film Composite Membranes with Enhanced Permeability and Selectivity
ACS Applied Nano Materials ( IF 5.3 ) Pub Date : 2020-09-02 , DOI: 10.1021/acsanm.0c01860 Yue Wen 1 , Xingran Zhang 1 , Xuesong Li 1 , Zhiwei Wang 1 , Chuyang Y. Tang 2
ACS Applied Nano Materials ( IF 5.3 ) Pub Date : 2020-09-02 , DOI: 10.1021/acsanm.0c01860 Yue Wen 1 , Xingran Zhang 1 , Xuesong Li 1 , Zhiwei Wang 1 , Chuyang Y. Tang 2
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Widespread applications of reverse osmosis (RO)-based processes call for high-performance thin-film composite (TFC) membranes. In this study, a TFC membrane by incorporating an ultrathin 2D metal–organic framework (MOF) (ZnTCPP) interlayer was developed for water purification, and the mechanisms in enhancing membrane permeability and selectivity were revealed. The introduction of the 2D MOF nanosheet interlayer nearly tripled the membrane water permeance (4.82 ± 0.55 L m–2 h–1 bar–1) with a simultaneous increase of NaCl rejection (97.4 ± 0.6%) compared to the control, successfully overcoming the permeability–selectivity trade-off. The combined use of quartz crystal microbalance and transmission electron microscopy revealed that the MOF interlayer induced the significant changes in the polyamide membrane structure that favors water permeation, i.e., decreased intrinsic thickness, increased void volume fraction, and enhanced effective filtration surface area. Such improvements in the polyamide structure can be attributed to the synergistic effects of enhanced confinement to interfacially degassed nanobubbles and reduced diffusivity of m-phenylenediamine monomers due to the MOF interlayer. This interlayer also increased the cross-linking degree of the polyamide layer (contributing to the increase of membrane selectivity) and served as a gutter layer (to further enhance membrane permeance by reducing the geometric restriction of the support layer). Our study highlights the potential of using ultrathin MOF nanosheets to fabricate high-performance TFC membranes for desalination and water purification.
中文翻译：
金属-有机骨架纳米片，用于薄膜复合膜，具有增强的渗透性和选择性
基于反渗透（RO）工艺的广泛应用要求高性能薄膜复合（TFC）膜。在这项研究中，通过结合超薄2D金属-有机骨架（MOF）（ZnTCPP）中间层的TFC膜被开发用于水净化，并揭示了增强膜渗透性和选择性的机理。二维MOF纳米片夹层的引入使膜的透水率几乎增加了两倍（4.82±0.55 L m –2 h –1 bar –1），与对照组相比，NaCl截留率同时提高（97.4±0.6％），成功克服了渗透率-选择性之间的折衷。石英晶体微天平和透射电子显微镜的结合使用表明，MOF夹层在聚酰胺膜结构中引起了明显的变化，有利于水的渗透，即，减小了固有厚度，增加了空隙体积分数并提高了有效过滤表面积。聚酰胺结构的这种改善可归因于对界面脱气的纳米气泡的限制作用增强和m扩散系数降低的协同作用。-苯二胺单体归因于MOF中间层。该中间层还提高了聚酰胺层的交联度（有助于提高膜的选择性），并用作檐槽层（通过减少支撑层的几何限制进一步提高了膜的渗透性）。我们的研究强调了使用超薄MOF纳米片制造用于脱盐和水净化的高性能TFC膜的潜力。
更新日期：2020-09-25
中文翻译：
金属-有机骨架纳米片，用于薄膜复合膜，具有增强的渗透性和选择性
基于反渗透（RO）工艺的广泛应用要求高性能薄膜复合（TFC）膜。在这项研究中，通过结合超薄2D金属-有机骨架（MOF）（ZnTCPP）中间层的TFC膜被开发用于水净化，并揭示了增强膜渗透性和选择性的机理。二维MOF纳米片夹层的引入使膜的透水率几乎增加了两倍（4.82±0.55 L m –2 h –1 bar –1），与对照组相比，NaCl截留率同时提高（97.4±0.6％），成功克服了渗透率-选择性之间的折衷。石英晶体微天平和透射电子显微镜的结合使用表明，MOF夹层在聚酰胺膜结构中引起了明显的变化，有利于水的渗透，即，减小了固有厚度，增加了空隙体积分数并提高了有效过滤表面积。聚酰胺结构的这种改善可归因于对界面脱气的纳米气泡的限制作用增强和m扩散系数降低的协同作用。-苯二胺单体归因于MOF中间层。该中间层还提高了聚酰胺层的交联度（有助于提高膜的选择性），并用作檐槽层（通过减少支撑层的几何限制进一步提高了膜的渗透性）。我们的研究强调了使用超薄MOF纳米片制造用于脱盐和水净化的高性能TFC膜的潜力。
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