Alumina (Al₂O₃) microfiltration membranes with holey interior structure exhibit the combined desirable properties of both superior permeability and good retention performance. These membranes are purposely made to consist of a holey intermediate layer with a thickness in the range 12.9‐15.5 μm and a top filtration layer of very thin thickness in the range 1.8‐2.8 μm, fabricated by cosintering with sacrificial carbon (C) particles. The holey structure in the intermediate layer, which can be well controlled by regulating the amount of C particles added to Al₂O₃ particles, contains plenty of holes of 1‐5 μm in size, thereby possessing much reduced water flow resistance. The thin top filtration layer, which contains uniformly distributed nanopores of 90‐100 nm in size, functions as the selective layer, thereby ensuring a good retention performance. At the C particle content of 30 wt. %, the Al₂O₃ membrane with holey interior structure demonstrates a super‐high pure water flux (3358 Lm^‐2h^‐1), which is almost twice that of the membrane without holey interior structure (1697 Lm^‐2h^‐1), while the mechanical strength and retention performance are well maintained.

中文翻译：

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通过牺牲性C颗粒实现具有多孔内部结构的高渗透性Al2O3微滤膜

具有多孔内部结构的氧化铝（Al ₂ O ₃）微滤膜具有优异的渗透性和良好的保留性能，同时具有理想的综合性能。这些膜特意制成由一个多孔的中间层组成，该中间层的厚度为12.9-15.5μm，顶部过滤层的厚度很薄，为1.8-2.8μm，是通过与牺牲碳（C）颗粒共烧结制成的。可以通过调节添加到Al ₂ O _3中的C颗粒的数量来很好地控制中间层中的多孔结构颗粒中包含大量1-5μm的孔，从而大大降低了水流阻力。薄的顶部过滤层包含尺寸均匀分布的90-100 nm的纳米孔，用作选择层，从而确保了良好的保留性能。在C颗粒含量为30重量％时。％，具有多孔内部结构的Al ₂ O ₃膜表现出超高纯水通量（3358 Lm ^-2 h ^-1），几乎是没有多孔内部结构的膜（1697 Lm ^-2 h ^-1）的两倍），同时保持了良好的机械强度和保持性能。