Seeding-free synthesis of zeolite FAU membrane for seawater desalination by pervaporation
Seeding-free synthesis of zeolite FAU membrane for seawater desalination by pervaporation
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DOI：
10.1016/j.micromeso.2016.07.050
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发表时间：
2016-11
影响因子：
5.2
通讯作者：
Chen Zhou;Junjie Zhou;A. Huang
中科院分区：
文献类型：
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作者：
Chen Zhou;Junjie Zhou;A. Huang
本研究采用无晶种合成的方法，在α-Al_2O_3管上制备了致密、物相纯的FAU沸石膜。3-氨丙基三乙氧基硅烷(APTES)作为分子连接剂将FAU前体锚定在载体表面，促进FAU分子筛膜的成核和形成。将制得的膜用于渗透汽化海水淡化。在75℃下，随着合成时间从12h增加到24h，FAU沸石膜的水通量从4.22万kg/m−2 h−1降至75℃下的3.42 kg/m−2 h−1，离子截留率从99%增加到99.9%。对于在75℃下反应20h的FAU沸石膜，随着进料温度从30℃升高到90℃，水通量从0.96g/m−2 h−1增加到5.64g/m−2 h−1，且FAU沸石膜的离子截留率均在99.8%以上。值得注意的是，FAU沸石膜对海水淡化表现出了很高的分离性能，甚至对10wt%的海水淡化也是如此，所开发的FAU沸石膜在海水淡化方面非常有前途。
In this study, dense and phase-pure zeolite FAU membrane has been prepared on α-Al2O3tube using a seeding-free synthesis strategy. 3-aminopropyltriethoxysilane (APTES) acts as a molecular linker for anchoring the FAU precursors onto the support surface to promote the nucleation and the formation of a thin, well intergrown zeolite FAU membrane. The obtained membranes are employed for desalination of seawater by pervaporation. With the increase of the synthesis time from 12 h to 24 h at 75 °C, the water fluxes of the zeolite FAU membranes reduce from 4.22 kg m−2h−1to 3.42 kg m−2h−1at 75 °C due to the increase of the thickness of the zeolite FAU membranes, while the ions rejections increase from 99% to 99.9%. For the zeolite FAU membrane which was prepared at 75 °C for 20 h, with increasing the feed temperature from 30 °C to 90 °C, the water fluxes increase from 0.96 kg m−2h−1to 5.64 kg m−2h−1, and all the ions rejections of the zeolite FAU membrane are above 99.8%. Note that the zeolite FAU membranes show high separation performances for seawater desalination, even for desalination of 10 wt% seawater, the developed zeolite FAU membranes are very promising in seawater desalination.