Fabrication and evaluation of effective zeolite membranes for water desalination
Fabrication and evaluation of effective zeolite membranes for water desalination
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DOI：
10.1016/j.desal.2021.114974
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发表时间：
2021-05
期刊：
影响因子：
9.9
通讯作者：
Yanju Wang;Huazhen Rong;Lei Sun;Panpan Zhang;Yuting Yang;Lingchang Jiang;Shengcheng Wu;G. Zhu-G.
中科院分区：
文献类型：
--
作者：
Yanju Wang;Huazhen Rong;Lei Sun;Panpan Zhang;Yuting Yang;Lingchang Jiang;Shengcheng Wu;G. Zhu-G.
采用种子生长法在不锈钢多孔网上分别制备了MFI、LTA和AEI型分子筛的致密无裂纹膜。采用实验和模拟相结合的方法研究了水在沸石中的吸附行为。在1.0 atm进料侧压力下，在所制备的膜上对盐水的渗透蒸发脱盐进行了实验评价。基于尺寸排阻效应，三种分子筛膜均表现出良好的离子截留率（>99%）。随着测试温度的升高，水渗透率提高，而不牺牲离子排斥。此外，可逆的水的吸收计算的吸附-脱附等温线发挥了关键的影响，水在沸石孔的流动性。因此，较高的可逆水吸收有助于促进水分子穿过沸石膜的运输，这由盐水脱盐中AEI > LTA > MFI膜的水渗透性顺序证明。可见，可逆吸水是渗透蒸发脱盐过程中控制水渗透性的一个重要特征，这将为今后脱盐膜材料的选择提供指导。
Three dense and crack-free membranes of MFI, LTA and AEI typed zeolites were fabricated respectively on porous stainless-steel nets using the seeded growth method. Experiments in couple with simulations were used to investigate water adsorption behaviors in zeolites. The pervaporation desalination of saltwater was evaluated experimentally on the as-prepared membranes at 1.0 atm feed side pressure. Based on the size-exclusion effect, the three zeolite membranes exhibited excellent ion rejection degrees (>99%). The water permeability was improved with increasing testing temperature without ion rejection sacrifice. Moreover, the reversible water uptakes calculated using adsorption-desorption isotherms played a critical influence on water mobility in the zeolite pores. As a result, higher reversible water uptake contributed to facilitate the transport of water molecules across zeolite membranes, evidenced by the water permeability sequence of AEI > LTA > MFI membranes in saltwater desalination. It is clear that reversible water uptake is an important distinction governing water permeability in the pervaporation desalination process, which will provide guidance to select desalination membrane materials for future research.