Abstract Ultrasonic-assisted pretreatment prior to hydrothermal synthesis is employed for the first time in the preparation of T-type zeolite membranes on α-Al2O3 hollow fibers by secondary growth. The synthesis time can be shortened from 40 h to 24 h with only 0.5 h ultrasonic pretreatment of the synthesis solution. Elongating ultrasonic treatment time to 1.0 h has no further improvement for the formation of dense membrane. Typically, the pure phase T-type zeolite membrane synthesized in 24 h with 0.5 h ultrasonic pretreatment has a separation factor of > 10,000 and a flux of 12.2 kg m−2 h−1 for 90.0 wt% isopropanol aqueous solution at 75 °C. When the porosity of the hollow fiber support is 68%, the flux is as high as 14.3 kg m−2 h−1, which is the highest flux ever reported. The high flux of the membrane can be mainly ascribed to the special structure and porosity of the α-Al2O3 hollow fiber support. Finally, a mechanism for ultrasonic-assisted membrane preparation is proposed.

中文翻译：

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在氧化铝空心纤维上超声辅助制备高通量 T 型沸石膜

摘要 超声辅助水热合成前预处理首次在α-Al2O3中空纤维上二次生长制备T型沸石膜。合成溶液仅需0.5小时超声预处理，合成时间可从40小时缩短至24小时。将超声波处理时间延长至 1.0 h 对致密膜的形成没有进一步的改善。通常，在 24 小时内用 0.5 小时超声预处理合成的纯相 T 型沸石膜具有 > 10,000 的分离因子和 12.2 kg m-2 h-1 的通量，用于 75 °C 的 90.0 wt% 异丙醇水溶液。当中空纤维载体的孔隙率为 68% 时，通量高达 14.3 kg m-2 h-1，这是有史以来报告的最高通量。膜的高通量主要归因于α-Al2O3中空纤维载体的特殊结构和孔隙率。最后，提出了超声辅助膜制备的机制。