Graphene based materials for carbon capture
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Date
2020
Authors
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Journal ISSN
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Publisher
University of Western Cape
Abstract
The adverse effects of CO2 and greenhouse gas emissions into the atmosphere is
believed to be one of the causes of climate change. The seriousness of global warming
is encouraging the development of technologies designed to reduce CO2 emissions.
Adsorption in the broadest context can be considered to be a promising method to
address this due to the energy saving potential and regenerability, compared to other
techniques. In this study, graphite was first oxidized to graphene oxide (GO) with
concentrated acid. This was followed by formation of the aminosilanes viz. 3-
aminopropyl-triethoxysilane (APTES), tris(2-aminoethyl)amine (TRIS) and guanidine
being functionalized onto the surface of graphene oxide (GO). A second series
involving the ordered mesoporous materials (OMS) was prepared employing
cetyltrimethylammonium bromide (CTAB) and P123 triblock copolymer, as the
structure directing agents for the organization of polymerizing silica species. Following
the self-assembly of OMS onto GO, the so formed GO-OMS compound was modified
with polyethylenimine (PEI). Several characterization techniques such as X-ray powder diffraction (XRD), Fourier
Transform Infra-Red (FT-IR) spectroscopy, high resolution scanning microscopy
(HRSEM), high resolution transmission electron microscopy (HRTEM) and N2
physisoprion employing the Brunauer-Emmett-Teller (BET) analysis to determine
specific surface areas of porous solid materials were employed to study the structural,
morphological and textural properties of the adsorbents.
Description
>Magister Scientiae - MSc
Keywords
Graphene oxide, APTES (amino propyl triethoxy silane, TRIS (2-aminoethyl) amine, Guanidine, Ordered mesoporous silica, Polyethylenimine