Abstract
In this work, aerogels were prepared using resorcinol-formaldehyde as a precursor in two synthetic routes, one basic and one acidic, to perform the adsorption of CO2 at 0 °C and atmospheric pressure. Aerogels were Characterization by N2 and CO2 Physisorption, Raman Spectroscopy, Scanning Electron Microscopy, and Infrared Spectroscopy. In general, was found that aerogels have a polymeric, disordered, three-dimensional structure and have a microporous surface. Langmuir, Freundlich, Sips and Toth equilibrium models present a good data fit of CO2 adsorption at relative pressure ranging between 1 × 10−4 and 3 × 10−2. The diffusion intra-particle kinetic model explains the setps of this process; the Elovich model also showed a good fit, therefore, there are an energetic heterogeneity of the CO2 superficial adsorption sites. The aerogel carbonized in basic medium at 1050 °C (ACB 1050) material was the best adsorbent of this pollutant, reaching an adsorption capacity of 6.43 mmol g−1.
Highlights
Global warming caused by greenhouse gases is leading to the destabilization of marine ecosystems, the rise in sea levels, and the acidification of the oceans [1]
This is consistent with reports in the literature, in which it is mentioned that the Langmuir and Freundlich models conform to the CO2 adsorption isotherms in certain partial pressure ranges
The conditions under which the carbonization of the organic aerogels was carried out produced materials with a large volume of ultramicropores; they are efficient in the adsorption of this atmospheric pollutant
Summary
Global warming caused by greenhouse gases is leading to the destabilization of marine ecosystems, the rise in sea levels, and the acidification of the oceans [1]. Capture and storage technology has been considered the best option to reduce carbon dioxide emissions from large sources, and adsorption is considered a promising process to separate gas mixtures [14]. This process is inexpensive, requires less regeneration energy, is easy to handle, has fast kinetics, and has a high capacity of CO2 adsorption and selectivity [4]. It is generally recognized that CO2 is physically adsorbed to activated carbon, mainly by condensation or liquefaction in pores with widths that are less than 1 nm [15] The adsorption of this greenhouse gas in nanopore materials has been investigated in zeolites exchanged with alkali metals, amino-modified and modified alkaline, mesoporous silicas, microporous polymers, carbons, and metalorganic structures [10]. Carbon aerogels were synthesized using resorcinol-formaldehyde precursors with two different synthesis routes (basic and acidic) and using suitable synthesis conditions to obtain materials with a high adsorption capacity of this pollutant
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