Petrified Hollow Fiber Membranes with Hierarchical Pores
Petrified Hollow Fiber Membranes with Hierarchical Pores
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DOI：
10.1021/acsmaterialslett.2c00063
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发表时间：
2022-04
影响因子：
11.4
通讯作者：
Lu Liu;Ching-En Ku;Chen Zhang
中科院分区：
文献类型：
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作者：
Lu Liu;Ching-En Ku;Chen Zhang
多孔氧化物中空纤维膜广泛应用于过滤和化学分离。它们传统上是通过1200°C以上的相转化烧结形成的，这限制了它们的大规模应用。受天然木材石化过程的启发，我们报道了在更低的温度(600°C)下通过石化聚合物中空纤维模板来制备多孔氧化物中空纤维膜。这些新型石化中空纤维膜再现了其聚合物中空纤维模板的不对称大孔结构，从而允许在没有二次包覆层的情况下截留大分子溶质。它们具有独特的层次化微/中/大孔结构，同时具有高比表面积和大孔容。这项工作的发现为多孔氧化膜的更广泛应用铺平了道路。更广泛地说，它们允许简单而廉价地控制分级多孔氧化物的几何形状。
Porous oxide hollow fiber membranes are broadly useful for filtration and chemical separation. They are traditionally formed by phase inversion-sintering above 1200 °C, which is expensive limiting their large-scale applications. Inspired by the natural wood petrification process, we report fabrication of porous oxide hollow fiber membranes via petrification of polymer hollow fiber templates at a much lower temperature (600 °C). These novel petrified hollow fiber membranes reproduce the asymmetric macropore structure of their polymer hollow fiber templates, thereby allowing rejection of macromolecular solutes without a secondary coating layer. They have a unique hierarchical micro-/meso-/macroporous structure with simultaneous high surface area and large pore volume. The findings of this work pave the way for wider applications of porous oxide membranes. More broadly, they allow simple and inexpensive control of the geometry of hierarchically porous oxides.