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首页> 外文期刊>Environmental Science & Technology >Nanometric Graphene Oxide Framework Membranes with Enhanced Heavy Metal Removal via Nanofiltration
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Nanometric Graphene Oxide Framework Membranes with Enhanced Heavy Metal Removal via Nanofiltration

机译：通过纳米过滤增强重金属去除的纳米氧化石墨烯骨架膜

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摘要

A novel dual-modification strategy, including (1) the cross-linking and construction of a GO framework by ethylenediamine (EDA) and (2) the amine-enrichment modification by hyperbranched polyethylenimine (HPEI), has been proposed to design stable and highly charged GO framework membranes with the GO selective layer thickness of 70 nm for effective heave metal removal via nanofiltration (NF). Results from sonication experiments and positron annihilation spectroscopy confirmed that EDA cross-linking not only enhanced structural stability but also enlarged the nanochannels among the laminated GO nanosheets for higher water permeability. HPEI 60K was found to be the most effective post-treatment agent that resulted in GO framework membranes with a higher surface charge and lower transport resistance. The newly developed membrane exhibited a high pure water permeability of 5.01 L m~(-2) h~(-1) bar~(-1) and comparably high rejections toward Mg~(2+), Pb~(2+), Ni~(2+), Cd~(2+), and Zn~(2+). These results have demonstrated the great potential of GO framework materials in wastewater treatment and may provide insights for the design and fabrication of the next generation two-dimensional (2D)-based NF membranes.
机译：提出了一种新颖的双重修饰策略，包括设计（1）乙二胺（EDA）交联和构筑GO骨架和（2）超支化聚乙烯亚胺（HPEI）进行的胺富集修饰。带电的GO框架膜的GO选择性层厚度为70 nm，可通过纳滤（NF）有效去除重金属。超声处理和正电子an没光谱的结果证实，EDA交联不仅增强了结构稳定性，而且扩大了叠层GO纳米片之间的纳米通道，从而具有更高的透水性。发现HPEI 60K是最有效的后处理剂，可导致GO骨架膜具有较高的表面电荷和较低的传输阻力。新开发的膜具有5.01 L m〜（-2）h〜（-1）bar〜（-1）的高纯水渗透率，并且对Mg〜（2 +），Pb〜（2+）， Ni〜（2 +），Cd〜（2+）和Zn〜（2+）。这些结果证明了GO框架材料在废水处理中的巨大潜力，并可能为下一代基于二维（2D）的NF膜的设计和制造提供见识。

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  • 来源
    《Environmental Science & Technology》 |2015年第16期|10235-10242|共8页
  • 作者

    Yu Zhang; Sui Zhang; Tai-Shung Chung;

  • 作者单位

    National University of Singapore (NUS) Graduate School for Integrative Science and Engineering, National University of Singapore, 28 Medical Drive, Singapore 117456, Singapore;

    Department of Chemical and Biomolecular Engineering, National University of Singapore, 4 Engineering Drive 4, Singapore 117585, Singapore;

    National University of Singapore (NUS) Graduate School for Integrative Science and Engineering, National University of Singapore, 28 Medical Drive, Singapore 117456, Singapore ,Department of Chemical and Biomolecular Engineering, National University of Singapore, 4 Engineering Drive 4, Singapore 117585, Singapore;

  • 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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