A facile preparation strategy was proposed for preparation of compact zeolite LTA membranes on polyethyleneimine(PEI)modified substrates without seeding.Through the functionalization of substrates by using PEI,compact...A facile preparation strategy was proposed for preparation of compact zeolite LTA membranes on polyethyleneimine(PEI)modified substrates without seeding.Through the functionalization of substrates by using PEI,compact LTA membranes can be formed on various kinds of substrates.A well-intergrown and phase-pure LTA membrane with a thickness of about 3.0μm is successfully prepared on the a-Al_(2)O_(3)disk after crystallization for 24 h at 60℃.Besides LTA membrane,wellintergrown zeolite FAU membranes can also be formed on PEI-modified a-Al_(2)O_(3)substrates,suggesting the universality of this strategy.The zeolite LTA membranes synthesized on PEI-modified a-Al_(2)O_(3)tubes were evaluated for the separation of alcohols/water mixture through pervaporation.The as-synthesized zeolite LTA membranes display high pervaporation performances.For the separation of 10 wt%isopropanol/water solution at 90℃,a high separation factor of44991 and a water flux of 1.73 kg m^(-2)h^(-1)are achieved.展开更多
基金Financial supports by the National Natural Science Foundation of China(Nos.21761132003,21878100)the Fundamental Research Funds for the Central Universities(No.40500-20101222093)are acknowledged。
文摘A facile preparation strategy was proposed for preparation of compact zeolite LTA membranes on polyethyleneimine(PEI)modified substrates without seeding.Through the functionalization of substrates by using PEI,compact LTA membranes can be formed on various kinds of substrates.A well-intergrown and phase-pure LTA membrane with a thickness of about 3.0μm is successfully prepared on the a-Al_(2)O_(3)disk after crystallization for 24 h at 60℃.Besides LTA membrane,wellintergrown zeolite FAU membranes can also be formed on PEI-modified a-Al_(2)O_(3)substrates,suggesting the universality of this strategy.The zeolite LTA membranes synthesized on PEI-modified a-Al_(2)O_(3)tubes were evaluated for the separation of alcohols/water mixture through pervaporation.The as-synthesized zeolite LTA membranes display high pervaporation performances.For the separation of 10 wt%isopropanol/water solution at 90℃,a high separation factor of44991 and a water flux of 1.73 kg m^(-2)h^(-1)are achieved.
