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Synthesis and Characterization of Novel Forward Osmosis Membranes based on Layer-by-Layer Assembly

机译：基于逐层组装的新型正向渗透膜的合成与表征

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摘要

Forward osmosis (FO) has received considerable interest for water- and energy-related applications in recent years. FO does not require an applied pressure and is believed to have a low fouling tendency. However, a major challenge in FO is the lack of high performance FO membranes. In the current work, novel nanofiltration (NF)-like FO membranes with good magnesium chloride retention were synthesized using layer-by-layer (LhL) assembly. The membrane substrate was tailored (high porosity, finger-like pores, thin cross-section, and high hydrophilicity) to achieve a small structural parameter of 0.5 mm. Increasing the number of polyelectroryte layers improved the selectivity of the LbL membranes while reducing their water permeability. The more selective membrane 6#LbL (with 6 polyelectrolyte layers) had much lower reverse solute transport compared to 3#LbL and l#LbL. Meanwhile, the FO water flux was found to be strongly affected by both membrane water permeability and solute reverse transport. Severe solute reverse transport was observed for the active-layer-facing-draw-solution membrane orientation, likely due to the suppression of Donnan exclusion as a result of the high ionic strength of the draw solution. In contrast, the active-layer-facing-feed-solution orientation showed remarkable FO performance (15, 20, and 28 L/m2.h at 0.1, 0.5, and 1.0 M MgCl2, respectively, for membrane 3#LbL using distilled water as feed solution), superior to other NF-like FO membranes reported in the literature. To the best of the knowledge of the authors, this is the first work on the synthesis and characterization of LbL based FO membranes.
机译：近年来，正渗透（FO）在与水和能源相关的应用中引起了极大的兴趣。 FO不需要施加压力，并且被认为具有低结垢趋势。然而，在FO中的主要挑战是缺乏高性能的FO膜。在当前的工作中，使用逐层组装（LhL）合成了具有良好的氯化镁保留能力的新型纳滤（NF）状FO膜。定制膜基材（高孔隙率，手指状孔，薄截面和高亲水性）以实现0.5 mm的较小结构参数。增加聚电解质层的数量可改善LbL膜的选择性，同时降低其透水性。与3＃LbL和1＃LbL相比，选择性更高的6＃LbL膜（具有6个聚电解质层）具有更低的反向溶质转运。同时，发现FO水通量受膜透水性和溶质反向转运的强烈影响。面对活性层的汲取溶液的膜取向观察到严重的溶质逆向传输，这可能是由于汲取溶液的高离子强度导致Donnan排斥的抑制。相比之下，使用蒸馏水的膜3＃LbL的活性层面对进料溶液的方向显示出显着的FO性能（分别在0.1、0.5和1.0 M MgCl2下分别为15、20和28 L / m2.h。作为进料溶液），优于文献中报道的其他类似NF的FO膜。据作者所知，这是基于LbL的FO膜的合成和表征的第一项工作。

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  • 来源
    《Environmental Science & Technology》 |2011年第12期|p.5201-5208|共8页
  • 作者

    Qi Saren; Chang Quan Qiu; Chuyang Y. Tang;

  • 作者单位

    School of Civil and Environmental Engineering Technological University,Singapore 639798,Singapore Membrane Technology CentreNanyang Technological University,Singapore 639798;

    School of Civil and Environmental Engineering Technological University,Singapore 639798,Singapore Membrane Technology CentreNanyang Technological University,Singapore 639798;

    School of Civil and Environmental Engineering Technological University,Singapore 639798,Singapore Membrane Technology CentreNanyang Technological University,Singapore 639798;

  • 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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