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首页> 外文期刊>Environmental Science & Technology >Hydrophilic Nanofibers as New Supports for Thin Film Composite Membranes for Engineered Osmosis
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Hydrophilic Nanofibers as New Supports for Thin Film Composite Membranes for Engineered Osmosis

机译：亲水性纳米纤维作为工程渗透用薄膜复合膜的新载体

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摘要

Engineered osmosis (e.g., forward osmosis, pressure-retarded osmosis, direct osmosis) has emerged as a new platform for applications to water production, sustainable energy, and resource recovery. The lack of an adequately designed membrane has been the major challenge that hinders engineered osmosis (EO) development. In this study, nanotechnology has been integrated with membrane science to build a next generation membrane for engineered osmosis. Specifically, hydrophilic nanofiber, fabricated from different blends of polyacrylonitrile and cellulose acetate via electro-spinning, was found to be an effective support for EO thin film composite membranes due to its intrinsically wetted open pore structure with superior interconnectivity. The resulting composite membrane exhibits excellent permselectivity while also showing a reduced resistance to mass transfer that commonly impacts EO processes due to its thin, highly porous nanofiber support layer. Our best membrane exhibited a two to three times enhanced water flux and 90% reduction in salt passage when compared to a standard commercial FO membrane. Furthermore, our membrane exhibited one of the lowest structural parameters reported in the open literature. These results indicate that hydrophilic nanofiber supported thin film composite membranes have the potential to be a next generation membrane for engineered osmosis.
机译：工程渗透（例如，正向渗透，压力缓和渗透，直接渗透）已经成为一种用于水生产，可持续能源和资源回收的新平台。缺乏适当设计的膜已成为阻碍工程渗透（EO）发展的主要挑战。在这项研究中，纳米技术已经与膜科学相结合，以构建用于工程渗透的下一代膜。具体地，发现由聚丙烯腈和乙酸纤维素的不同共混物通过电纺丝制成的亲水性纳米纤维由于其固有地润湿的开孔结构和优异的互连性而成为EO薄膜复合膜的有效载体。所得的复合膜表现出优异的渗透选择性，同时由于其薄的，高度多孔的纳米纤维支撑层，还降低了传质阻力，这通常会影响EO工艺。与标准的商用FO膜相比，我们最好的膜表现出2至3倍的水通量提高和90％的盐通过率降低。此外，我们的膜表现出公开文献中报道的最低的结构参数之一。这些结果表明，亲水性纳米纤维负载的薄膜复合膜具有成为工程渗透的下一代膜的潜力。

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  • 来源
    《Environmental Science & Technology》 |2013年第3期|1761-1769|共9页
  • 作者

    Nhu-Ngoc Bui; Jeffrey R. McCutcheon;

  • 作者单位

    Department of Chemical and Biomolecular Engineering and Center for Environmental Sciences and Engineering, University of Connecticut, 191 Auditorium Road, Unit 3222, Storrs, Connecticut, 06269-3222, United States;

    Department of Chemical and Biomolecular Engineering and Center for Environmental Sciences and Engineering, University of Connecticut, 191 Auditorium Road, Unit 3222, Storrs, Connecticut, 06269-3222, 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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  • 正文语种 eng
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