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).
We report a facile and scalable method for the preparation of a carbon-based porous material through steam activation of a graphene aerogel (GA). The morphology and porous attributes of the steam activated graphene aerogel (SAGA) have been well investigated by scanning electron microscopy, transmission electron microscopy, and nitrogen adsorption-desorption experiments. The structure and chemical composition of the obtained SAGA have been disclosed through X-ray diffraction, X-ray photoelectron spectroscopy, and Raman spectroscopy. The as-prepared SAGA exhibits a high BrunauerEmmett-Teller specific surface area (830-1230 m 2 g À1 ), an abundant large pore volume (2.2-3.6 cm 3 g À1 ), and excellent thermal stability. The SAGA shows excellent adsorption capabilities for toluene (710 mg g À1 ) and methanol (641 mg g À1 ) at saturated vapor pressure and room temperature.
Hypercrosslinked carbazole-based porous organic polymers were prepared via FeCl3-promoted one-step oxidative coupling reaction and Friedel–Crafts alkylation in one pot.
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