National Center for Nanoscience and Technology , Beijing 100190, China.
ACS Appl Mater Interfaces. 2013 Sep 25;5(18):9172-9. doi: 10.1021/am402661t. Epub 2013 Sep 12.
We report a facile method for the fabrication of three-dimensional (3D) porous materials via the interaction between graphene oxide (GO) sheets and polyethylenimine (PEI) with high amine density at room temperature under atmospheric pressure without stirring. The structural and physical properties of GO-PEI porous materials (GEPMs) are investigated by scanning electron microscopy, X-ray diffraction, thermogravimetric analysis, and nitrogen adsorption-desorption measurement and their chemical properties are analyzed by X-ray photoelectron spectroscopy, infrared spectroscopy, and Raman spectroscopy. GEPMs possess low density and hierarchical morphology with large specific surface area, and big pore volume. Furthermore, the as-prepared 3D porous materials show an excellent adsorption capacity for acidic dyes on the basis of the pore-rich and amine-rich graphene structure. GEPMs exhibit an extremely high adsorption capacity for amaranth (800 mg g(-1)), which are superior to other carbon materials. In addition, GEPMs also exhibit good adsorption capacity for carbon dioxide (11.2 wt % at 1.0 bar and 273 K).
我们报道了一种在室温常压下、无需搅拌的条件下，通过氧化石墨烯（GO）片与高胺密度的聚乙烯亚胺（PEI）之间的相互作用，制备三维（3D）多孔材料的简便方法。通过扫描电子显微镜、X 射线衍射、热重分析和氮气吸附-脱附测量研究了 GO-PEI 多孔材料（GEPMs）的结构和物理性质，并通过 X 射线光电子能谱、红外光谱和拉曼光谱分析了其化学性质。GEPMs 具有低密度和分级形貌，具有大的比表面积和大的孔体积。此外，基于富含孔和富含胺的石墨烯结构，所制备的 3D 多孔材料对酸性染料表现出优异的吸附能力。GEPMs 对苋菜红（800mg g(-1)）表现出极高的吸附能力，优于其他碳材料。此外，GEPMs 对二氧化碳（在 1.0 巴和 273 K 下为 11.2wt%）也表现出良好的吸附能力。
