Preparation and optimization of mordenite nanocrystal-layered membrane for dehydration by pervaporation
Preparation and optimization of mordenite nanocrystal-layered membrane for dehydration by pervaporation
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DOI：
10.1016/j.micromeso.2014.12.032
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发表时间：
2015-05
影响因子：
5.2
通讯作者：
Yaqi Zhang;Y. Nakasaka;T. Tago;A. Hirata;Yuki Sato;T. Masuda
中科院分区：
文献类型：
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作者：
Yaqi Zhang;Y. Nakasaka;T. Tago;A. Hirata;Yuki Sato;T. Masuda
成功制备了由丝光沸石包覆层和保护层组成的丝光沸石纳米层状膜。将所获得的丝光沸石膜应用于在60至100 °C的温度下使用渗透蒸发方法从水/有机溶液（有机溶剂：乙醇、丙酮、异丙醇或乙酸）中分离水。在每个水/有机溶液体系中，水通过丝光沸石膜的渗透率几乎相同，而与进料溶液中的有机溶剂类型无关。相反，有机分子的渗透性取决于它们的极性。母液的预老化温度和形成保护层的加热速率影响形成保护层的二次生长过程，导致保护层中晶体的形貌和尺寸不同。水通量随着保护层中的晶体尺寸的减小而增加，因为丝光沸石晶体之间的非沸石孔的数量随着晶体尺寸的减小而增加。
Mordenite nanocrystal-layered membranes consisting of a mordenite nanocrystal layer and protection layer were successfully prepared. The obtained mordenite membranes were applied to the separation of water from water/organic solutions (organic solvents: ethanol, acetone, iso-propanol, or acetic acid) using a pervaporation method at temperatures from 60 to 100 °C. Water permeance through the mordenite membrane in each water/organic solution system was almost identical regardless of organic solvent types in the feed solution. In contrast, the permeance of the organic molecules depended on their polarities. The pre-aging temperature of the mother liquid and the heating rate for formation of the protection layer affected the secondary growth process that formed the protection layer, leading to different morphologies and sizes of the crystals in the protection layer. Water flux increased with decreasing crystal size in the protection layer because the number of non-zeolitic pores among the mordenite crystal increased as the crystal size decreased.