Ultrathin reduced graphene oxide/MOF nanofiltration membrane with improved purification performance at low pressure.
Ultrathin reduced graphene oxide/MOF nanofiltration membrane with improved purification performance at low pressure.
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DOI：
10.1016/j.chemosphere.2018.04.064
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发表时间：
2018-08
期刊：
影响因子：
8.8
通讯作者：
Peng Zhang;Jilai Gong;G. Zeng;Biao Song;Hong-yu Liu;Shuangyan Huan;Juan Li
中科院分区：
文献类型：
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作者：
Peng Zhang;Jilai Gong;G. Zeng;Biao Song;Hong-yu Liu;Shuangyan Huan;Juan Li
在这里，我们展示了一种替代的部分还原氧化石墨烯/金属有机框架纳米级层压膜，用于在低压下去除染料和重金属离子。与纯prGO膜相比，新型UiO-66-（COOH）2/prGO膜具有疏松的结构和优异的选择渗透性，对低压纳滤的渗透性能有显着增强。采用X射线衍射（XRD）、傅里叶变换红外光谱（FT-IR）、X射线光电子能谱（XPS）和扫描电子显微镜（SEM）对UiO-66-（COOH）2/prGO膜进行了表征。实验结果表明，复合膜对纯水的通量为20.0 ± 2.5 Lm− 2 h −1bar−1，在相同的prGO负载量下，约为原始prGO膜的通量（6.5 ± 1.2 Lm− 2 h −1bar−1）的2.9倍。结果表明，UiO-66-（COOH）2/prGO膜对有机染料具有较高的截留率，对带负电荷的刚果红和带正电荷的亚甲基蓝的截留率分别为98.2 ± 1.7%和92.55 ± 2.5%。此外，对重金属离子的截留率也可以有效地提高，对于Cu 2+高达96.5-83.1%，对于Cd 2+高达92.6-80.4%，表明静电相互作用对离子的纳米通道的积极影响。因此，有理由相信新型UiO-66-（COOH）2/prGO膜在水处理中具有巨大的潜在应用。
Here we demonstrated an alternative partial reduction graphene oxide/metal-organic frameworks nano-scale laminated membrane for dyes and heavy metal ions removal at low pressure. Compared with pure prGO membranes, the novel UiO-66-(COOH)2/prGO membranes with loose structure and excellent selective permeability demonstrated significant enhancements of permeation for low-pressure nanofiltration. The UiO-66-(COOH)2/prGO membranes possess more nanochannels structure, high surface charge and stability, which were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), X-ray photoelectron spectroscopy (XPS) and scanning electron microscope (SEM). The experiment result indicated that the flux of composite membranes for pure water was 20.0 ± 2.5 Lm−2h−1bar−1, about 2.9 times higher than that (6.5 ± 1.2 Lm−2h−1bar−1) of the pristine prGO membranes at the same prGO loading. The high rejection of UiO-66-(COOH)2/prGO membranes for organic dyes (98.2 ± 1.7% for negatively charged congo red and 92.55 ± 2.5% for positively charged methylene blue) were exhibited. Moreover, the rejection for heavy metal ions also can be efficiently improved up to 96.5–83.1% for Cu2+and 92.6–80.4% for Cd2+, indicating the positive effect of the electrostatic interaction on the nanochannels for ions. Therefore, it is reasonable to believe that novel UiO-66-(COOH)2/prGO membranes have great potential application in water treatment.