Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, College of Environmental Science and Engineering, Hunan University, Changsha, 410082, PR China.
Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, College of Environmental Science and Engineering, Hunan University, Changsha, 410082, PR China.
Chemosphere. 2018 Aug;204:378-389. doi: 10.1016/j.chemosphere.2018.04.064. Epub 2018 Apr 13.
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)/prGO membranes with loose structure and excellent selective permeability demonstrated significant enhancements of permeation for low-pressure nanofiltration. The UiO-66-(COOH)/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 Lmhbar, about 2.9 times higher than that (6.5 ± 1.2 Lmhbar) of the pristine prGO membranes at the same prGO loading. The high rejection of UiO-66-(COOH)/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 Cu and 92.6-80.4% for Cd, indicating the positive effect of the electrostatic interaction on the nanochannels for ions. Therefore, it is reasonable to believe that novel UiO-66-(COOH)/prGO membranes have great potential application in water treatment.
在这里，我们展示了一种替代的部分还原氧化石墨烯/金属有机骨架纳米级层压膜，用于在低压下去除染料和重金属离子。与纯 prGO 膜相比，具有疏松结构和优异选择性渗透性的新型 UiO-66-(COOH)/prGO 膜在低压纳滤方面表现出显著的渗透性能提升。UiO-66-(COOH)/prGO 膜具有更多的纳米通道结构、高表面电荷和稳定性，这可以通过 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) 进行表征。实验结果表明，复合膜对纯水的通量为 20.0±2.5 Lmhbar，比原始 prGO 膜（相同 prGO 负载量下为 6.5±1.2 Lmhbar）高 2.9 倍。UiO-66-(COOH)/prGO 膜对有机染料（带负电荷的刚果红的截留率为 98.2±1.7%，带正电荷的亚甲基蓝的截留率为 92.55±2.5%）具有很高的截留率。此外，对重金属离子的截留率也可以有效提高，Cu 的截留率高达 96.5-83.1%，Cd 的截留率高达 92.6-80.4%，表明静电相互作用对纳米通道中离子的积极影响。因此，可以合理地认为新型 UiO-66-(COOH)/prGO 膜在水处理方面具有很大的应用潜力。
