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首页> 外文期刊>Environmental Science & Technology >Tailoring the Structure of Thin Film Nanocomposite Membranes to Achieve Seawater RO Membrane Performance
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Tailoring the Structure of Thin Film Nanocomposite Membranes to Achieve Seawater RO Membrane Performance

机译：量身定制薄膜纳米复合膜的结构以实现海水反渗透膜的性能

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摘要

Herein we report on the formation and characterization of pure polyamide thin film composite (TFC) and zeolite-polyamide thin film nanocomposite (TFN) reverse osmosis (RO) membranes. Four different physical-chemical post-treatment combinations were applied afterthe interfacial polymerization reaction to change the molecular structure of polyamide and zeolite-polyamide thin films. Both TFC and TFN hand-cast membranes were more permeable, hydrophilic, and rough than a commercial seawater RO membrane. Salt rejection by TFN membranes was consistently below that of hand-cast TFC membranes; however, two TFN membranes exhibited 32 g/L NaCI rejections above 99.4%, which was better than the commercial membrane under the test conditions employed. The nearly defect-free TFN films that produced such high rejections were achieved only with wet curing, regardless of other post-treatments. Polyamide films formed in the presence of zeolite nanoparticles were less cross-linked than similarly cast pure polyamide films. At the very low nanoparticle loadings evaluated, differences between pure polyamide and zeolite-polyamide membrane water and salt permeability correlated weakly with extent of cross-linking of the polyamide film, which suggests that defects and molecular-sieving largely govern transport through zeolite-polyamide thin film nanocomposite membranes.
机译：本文中，我们报道了纯聚酰胺薄膜复合材料（TFC）和沸石-聚酰胺薄膜纳米复合材料（TFN）反渗透（RO）膜的形成和表征。界面聚合反应后，采用四种不同的物理化学后处理组合，以改变聚酰胺和沸石-聚酰胺薄膜的分子结构。与商用海水反渗透膜相比，TFC和TFN手工浇铸膜都更具渗透性，亲水性和粗糙性。 TFN膜的脱盐率始终低于手工浇铸的TFC膜。但是，两种TFN膜在99.4％以上都显示出32 g / L的NaCl截留率，在所采用的测试条件下优于商用膜。不管其他后处理如何，只有通过湿固化才能获得产生如此高剔除率的几乎无缺陷的TFN膜。在沸石纳米颗粒存在下形成的聚酰胺薄膜比类似的流延纯聚酰胺薄膜的交联少。在评估的极低纳米粒子负载量下，纯聚酰胺与沸石-聚酰胺膜的水和盐渗透性之间的差异与聚酰胺薄膜的交联程度之间的相关性很弱，这表明缺陷和分子筛在很大程度上决定了沸石-聚酰胺薄膜的传输膜纳米复合膜。

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  • 来源
    《Environmental Science & Technology》 |2010年第21期|p.8230-8235|共6页
  • 作者

    MARY LAURA LIND; DANIEL EUMINE SUK; THE-VINH NGUYEN; ERIC M. V. HOEK;

  • 作者单位

    Arizona State University School of Engineering of Transport, Matter and Energy, P.O. Box 876106 Tempe, AZ 85287-6106, United States;

    rnSamsung Cheil Industries Inc., E-Project Team, 332-2 Gocheon-dong, Uiwang-si, Gyeonggi-do, Korea 437-711;

    rnVietnam National University-Hochiminh City,Hochiminh City University of Technology, Faculty of Environment,268 Ly Thuong Kiet Street, District 10, Hochiminh City, Vietnam;

    rnDepartment of Civil & Environmental Engineering and California Nanosystems Institute,University of California, Los Angeles(UCLA),Los Angeles, California, United States;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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