Employing alloys as membrane support has shown promising industrial potential for application, because alloys exhibit excellent mechanical strength and ductility. However, alloys present intractable shortcomings, like large pore size and inadequate bonding strength, hindering membranes' formation and thereby limiting their widely use. In this work, a novel interlayer strategy was proposed to make a non-uniformly macroporous alloy suitable for zeolite membranes growth. Electroplated interlayers were firstly applied to refine supports’ pore size distribution, leading to improved surface homogeneity and average pore size. Layered double hydroxide (LDH) interlayers were then incorporated to regulate the surface hydroxyl content, hydrophilicity, and roughness, thus promoting the Linde type A (LTA) zeolite hetero-nucleation. The obtained LTA/LDH/Ni–P/Alloy membranes presented a HO/N selectivity of 107 and HO permeability of 10,520 GPU (30 °C, 0.1 MPa, and a relative humidity of 90%), and its HO permeability was much higher than conventional polymer membrane. Subsequently, the strategy showed its universality in the fabrication of CAU-1 membranes, a type of metal-organic frameworks (MOFs), where the as-synthesized sample displayed a dense morphology. The results of this study open new insights for the usage of cost-effective coarse alloy support and exploration of facile support modification methods.

中文翻译：

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在粗合金载体上制备具有高水蒸气渗透性的致密 LTA 膜的层间策略

采用合金作为膜载体已显示出广阔的工业应用潜力，因为合金表现出优异的机械强度和延展性。然而，合金存在一些棘手的缺点，如孔径大和结合强度不足，阻碍了膜的形成，从而限制了其广泛使用。在这项工作中，提出了一种新颖的夹层策略来制造适合沸石膜生长的非均匀大孔合金。电镀中间层首先用于细化载体的孔径分布，从而改善表面均匀性和平均孔径。然后引入层状双氢氧化物（LDH）中间层来调节表面羟基含量、亲水性和粗糙度，从而促进林德A型（LTA）沸石异质成核。所得LTA/LDH/Ni-P/Alloy膜的H2O/N选择性为107，H2O渗透率为10,520 GPU（30℃，0.1MPa，相对湿度90%），且H2O渗透率更高与传统的聚合物膜相比。随后，该策略在 CAU-1 膜（一种金属有机框架 (MOF)）的制造中显示出其普遍性，其中合成的样品显示出致密的形态。这项研究的结果为使用具有成本效益的粗合金支撑和探索简便的支撑改性方法开辟了新的见解。