Three-dimensionally macroporous, Si and N-incorporated graphene aerogels for gas adsorbents

Abstract

Three-dimensionally macroporous, Si and N-incorporated graphene aerogels (3D SN-rGOAs) are successfully fabricated through a self-assembly, vapor deposition of (3-aminopropyl)triethoxysilane (APTES), and thermal treatment for gas adsorption applications. As investigated by spectroscopic methods, the interaction between oxygen-containing groups of GO and APTES results in the uniform incorporation of Si and N atoms on the surface of 3D SN-rGOAs. The resulting SN-rGOAs are composed of the 3D interconnected macroporous structures with the mesoporosity by means of the reorganization of rGO sheets. The existence and distribution of Si and N atoms are characterized and their atomic compositions are 6.19 and 4.24%, respectively. Even after the incorporation of Si and N atoms, the surface area and pore volume of SN-rGOAs are slightly larger than those of pristine rGOAs due to thermal treatment at 900 C, which also promotes the further restoration of sp 2 conjugation. The as-obtained SN-rGOAs show a dramatic improvement in the adsorption capacities and kinetics of CO 2 and SO 2 because of the existences of Si and N atoms and 3D macroporous continuity.

A new class of porous materials for efficient CO2 separation: Ionic liquid/graphene aerogel composites

“…For instance, Sui et al [22] showed that CO 2 uptake was more than doubled from 0.93 to 2.45 mmol/g at 1000 mbar and 0 C upon steam activation of a three-dimensional porous graphene-based material. Yun et al [31], on the other hand, fabricated Si-and N-incorporated GAs through vapor deposition of (3-aminopropyl)triethoxysilane (APTES) and showed an increase in CO 2 uptake from 1.74 to 2.38 mmol/g at 10,000 mbar and 25 C upon the deposition of APTES. Sui et al [23] reported an enhancement in CO 2 uptake from 1.6 to 2.6 mmol/g at 1000 mbar and 0 C, when GA was doped with nitrogen.…”

Graphene-based polymer nanocomposite membranes: a review

“…It causes various mutagenesis being non soluble in physiological pH aqueous solution (e.g. graphene/CNTs) or because they cannot be handled …”