Preparation of Three-Dimensional Graphene Oxide–Polyethylenimine Porous Materials as Dye and Gas Adsorbents

Abstract

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).

Simple synthesis of porous melamine-formaldehyde resins by low temperature solvothermal method and its CO2 adsorption properties

“…To mitigate the effect of global warming, many porous materials, such as metal organic frameworks (MOFs) [5][6][7][8][9], porous co-ordination polymers [10,11], porous carbons [12][13][14][15][16], porous organic polymers (POPs) and covalent organic frameworks (COFs) [17][18][19][20], have been investigated for CO 2 storage. In recent years, many amine functionalized or nitrogen-rich porous materials were found to show good CO 2 adsorption properties because of the existence of strong interactions between the nitrogen functionality and CO 2 molecules [21][22][23][24][25][26][27]. Among them, the porous melamine-formaldehyde resins (PMFRs) have gained great attention because they can be produced by low-cost highly abundant melamine that has suitable alkalescence (pKa = 5.5) versatile reactivity [28][29][30].…”

One Pot Synthesis of Nickel Nanoparticles Stabilized on rGO/Polyethyleneimine Aerogel for the Catalytic Hydrogen Generation

“…To form graphene/bPEI gel, pH is a critical factor, since if pH is not correctly set, the gel will not be homogeneous [3]. bPEI is protonated at acidic pH values, but at higher pH, it is neutral [52], and amine groups can have interactions with oxygen containing groups of GO such as -OH, -COOH groups.…”

“…Graphene oxide (GO) is a single-atom-thick two-dimensional carbon material [1,2], with different functional groups, such as epoxy, hydroxyl and carboxylic groups [3]. In recent years, due to its special properties such as excellent thermal, mechanical, and electrical properties, GO has been used in various fields [4].…”

“…Self-assembly of graphene sheets by gelators involving different noncovalent interactions is a convenient method for preparing supramolecular hydrogels [14][15][16]. Hydrogels are prepared using different kinds of linkers, some of which include polymers [3], organic molecules [17], metal oxides [18,19], DNA molecules [20], and metal nanoparticles [21]. PEI as a commercially available polymer is well-known with two structures including branched and linear.…”

The impact of surface chemistry and texture on the CO2 uptake capacity of graphene oxide

“…For these reasons, the porous and functionalized layered structure of GO constitutes a logical candidate for next-generation CO 2 adsorbents [19]. Whilst the work on this topic is still limited [20,21], there is a prevalence in the literature of GO powders prepared using the classical Hummer's method. Overall, claims of their CO 2 uptake capacity have been markedly disappointing (<1 mmol g −1 ) [16,[22][23][24].…”