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首页> 外文期刊>Environmental Science & Technology >Rightsizing Nanochannels in Reduced Graphene Oxide Membranes by Solvating for Dye Desalination
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Rightsizing Nanochannels in Reduced Graphene Oxide Membranes by Solvating for Dye Desalination

机译：通过溶剂化脱盐使还原石墨烯氧化物膜中的纳米通道合理化

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摘要

Membranes with high water permeance, near-zero rejection to inorganic salts (such as NaCl and Na2SO4), and almost 100% rejection to organic dyes are of great interest for the dye desalination (the separation of dyes and salts) of textile wastewater. Herein, we prepared reduced graphene oxide membranes in a solvation state (S-rGO) with nanochannel sizes rightly between the salt ions and dye molecules. The S-rGO membrane rejects 99.0% of Direct Red 80 (DR 80) and has almost zero rejection for Na2SO4. By contrast, conventional GO or rGO membranes often have channel sizes smaller than divalent ions (such as SO42-) and thus high rejection for Na2SO4. More interestingly, high salinity in typical dye solutions decreases the channel size in the S-rGO membranes and thus increases the dye rejection, while the Na2SO4 rejection decreases because of the negatively charged surface on GO and the salt screening effect. The membranes also show pure water permeance as high as 80 L m(-2) h(-1) bar(-1), which is about 8 times that of commercial NF 90 membrane and 2 times that of a commercial ultrafiltration membrane (with a molecular weight cutoff of 2000 Da), rendering their promise for practical dye desalination.
机译：具有高水渗透性，对无机盐（例如NaCl和Na2SO4）的接近零排阻以及对有机染料的几乎100％排阻的膜对于纺织废水的染料脱盐（染料和盐的分离）非常重要。本文中，我们制备了处于溶剂化状态的还原型氧化石墨烯膜（S-rGO），纳米通道的大小恰好介于盐离子和染料分子之间。 S-rGO膜可滤除直接红80（DR 80）的99.0％以上，对Na2SO4的滤除几乎为零。相比之下，常规的GO或rGO膜的通道尺寸通常小于二价离子（例如SO42-），因此对Na2SO4的排斥率很高。更有趣的是，典型染料溶液中的高盐度减小了S-rGO膜的通道尺寸，从而增加了染料截留率，而Na2SO4截留率却由于GO上带负电荷的表面和盐分屏蔽作用而减小。该膜还显示出高达80 L m（-2）h（-1）bar（-1）的纯水渗透率，约为商业NF 90膜的8倍和商业超滤膜的2倍（含（分子量截断值为2000 Da），使它们有望用于实际的染料脱盐。

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  • 来源
    《Environmental Science & Technology》 |2018年第21期|12649-12655|共7页
  • 作者

    Huang Liang; Huang Suting; Venna Surendar R.; Lin Haiqing;

  • 作者单位

    SUNY Buffalo, Dept Chem & Biol Engn, Buffalo, NY 14260 USA;

    Nat Energy Technol Lab AECOM, 626 Cochrans Mill Rd, Pittsburgh, PA 15236 USA;

  • 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);
  • 原文格式 PDF
  • 正文语种 eng
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