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Date of Publication:2022-10-09

Journal:化工进展

Volume:36

Issue:11

Page Number:4170-4175

ISSN No.:1000-6613

Abstract:A continuous and uniform seed layer was obtained by modifying the surface defects of the low-cost macroporous α-Al2O3 tube support by the two-step hot-dip coating method. The ultra-thin NaA zeolite membranes were prepared by microwave-assisted synthesis in a short time,and they were used for pervaporative desalination. It is found that the permeation flux of water decreased slightly with the increase of salt concentration and the increase of operating temperature had a significant effect on the water flux. When the salt concentration of feed was 0.6mol/L and the operating temperature was 85℃,the water flux reached 11.03kg/(m2·h). But the ion retention rate was not affected by the operating temperature and the concentration of the feed solution,and remained at more than 99.9％. In addition,NaA zeolite membrane showed high stability in the pervaporative desalination,and the performance was stable for more than 72h in the 0.6mol/L NaCl solution at 75℃. The method can effectively improve water flux and ions rejection while reducing the cost of membrane preparation, which indicates that NaA zeolite membrane has a good application prospect in the field of membrane desalination.

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