Nanometric Graphene Oxide Framework Membranes with Enhanced Heavy Metal Removal via Nanofiltration.
Nanometric Graphene Oxide Framework Membranes with Enhanced Heavy Metal Removal via Nanofiltration.
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DOI：
10.1021/acs.est.5b02086
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发表时间：
2015-08
影响因子：
11.4
通讯作者：
Yu Zhang-;Sui Zhang;T. Chung
中科院分区：
文献类型：
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作者：
Yu Zhang-;Sui Zhang;T. Chung
提出了一种新的双重改性策略，包括（1）通过乙二胺（EDA）交联和构建GO骨架和（2）通过超支化聚乙烯亚胺（HPEI）富集胺改性，以设计稳定和高电荷的GO骨架膜，其GO选择层厚度为70 nm，用于通过纳滤（NF）有效去除重金属。超声处理实验和正电子湮没光谱的结果证实，EDA交联不仅增强了结构稳定性，而且扩大了层压GO纳米片之间的纳米通道，以获得更高的透水性。发现HPEI 60 K是最有效的后处理剂，其导致具有较高表面电荷和较低输送阻力的GO框架膜。新开发的膜具有5.01 L m（-2）h（-1）bar（-1）的高纯水渗透率和对Mg（2+）、Pb（2+）、Ni（2+）、Cd（2+）和Zn（2+）的高截留率。这些结果证明了GO骨架材料在废水处理中的巨大潜力，并可为下一代基于二维（2D）的NF膜的设计和制造提供见解。
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.