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Optimizing the Properties of Hybrids Based on Graphene Oxide for Carbon Dioxide Capture.

ABSTRACT: The reduction of CO₂ emissions and its elimination from the atmosphere has become one of the major problems worldwide, since CO₂ is the main cause of the greenhouse effect and climate change. In recent years, a great number of carbonaceous materials that can be used as CO₂ adsorbents have been synthesized. The strategy is usually to synthesize the materials and determine their adsorption capacity without studying previously the factors that influence this capacity. In this work, different properties of the adsorbents are analyzed to study their influence on the CO₂ adsorption capacity. For this purpose, 10 adsorbents have been synthesized using different strategies and characterized with X-ray photoelectron spectroscopy, X-ray diffraction, and micro-Raman spectroscopy. The percentage of sp² carbons, the position of the D + D' peak of the second-order Raman spectrum, the micropore volume, and the grain size of the C sp² domains have been related to the amount of CO₂ adsorbed by the adsorbents. The results confirm a linear relationship between the volume of the micropores and the CO₂ uptake and it proves that CO₂ retention is favored in those materials that, in addition to having a high volume of micropores, also have low grain size of C.

SUBMITTER: Ye Y

PROVIDER: S-EPMC8796650 | biostudies-literature | 2022 Jan

REPOSITORIES: biostudies-literature

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Optimizing the Properties of Hybrids Based on Graphene Oxide for Carbon Dioxide Capture.

Ye Yating Y Vega Martín L L Sánchez Montero M J MJ López-Díaz D D Velázquez M M MM Merchán M D MD

Industrial & engineering chemistry research 20220113 3

The reduction of CO2 emissions and its elimination from the atmosphere has become one of the major problems worldwide, since CO2 is the main cause of the greenhouse effect and climate change. In recent years, a great number of carbonaceous materials that can be used as CO2 adsorbents have been synthesized. The strategy is usually to synthesize the materials and determine their adsorption capacity without studying previously the factors that influence this capacit ...[more]

PMID: 35110829

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Project description:This work aimed to investigate the CO2 gas barrier and mechanical properties of fluorine rubber nanocomposites filled with Ca/Al layered hydroxide (graphene oxide [GO]/LDH-Ca2Al) modified by GO. GO/LDH-Ca2Al nanocomposite fillers were prepared by depositing Ca/Al layered hydroxide (LDH-Ca2Al) into the surface of alkalized GO (Al-GO). The prepared GO/LDH-Ca2Al nanocomposite fillers and complexes were characterized by Fourier infrared spectroscopy (FTIR), X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM) for structural and micromorphological characterization. The results showed that GO/LDH-Ca2Al was successfully prepared with strong interactions between Al-GO and LDH, and the compatibility of GO/LDH-Ca2Al nanocomposite fillers with the polymer was significantly improved compared with that of LDH-Ca2Al. Consequently, both the fracture strength (σb) and strain (εb) of GO/LDH-Ca2Al nanocomplexes remarkably increased, and they exhibited excellent mechanical properties. Differential scanning calorimetry and thermogravimetric analysis were used to characterize the thermal stability of GO/LDH-Ca2Al nanocomposite fillers, and GO/LDH-Ca2Al nanocomposite fillers have better thermal stability than LDH-Ca2Al. The reaction products (S-LDH-Ca2Al and S-GO-Ca2Al) of LDH-Ca2Al and GO/LDH-Ca2Al with CO2 were characterized using XRD and TGA, respectively, and the results show that LDH-Ca2Al reacts readily and chemically with CO2, resulting in a lower diffusion coefficient of CO2 in the LDH-Ca2Al nanocomplexes than that of the GO/LDH-Ca2Al nanocomplexes and leading to the destruction of the laminar structure of LDH-Ca2Al, while GO/LDH-Ca2Al has better CO2 resistance stability. GO/LDH-Ca2Al nanocomplexes exhibited a reduced content of hydroxyl groups with pro-CO2 nature exposed on the surface of LDH-Ca2Al, improving the interfacial interaction between the nanofillers and the rubber matrix and enhancing the dispersion of GO/LDH-Ca2Al in the polymers. Moreover, CO2 in the soluble GO/LDH-Ca2Al nanocomposites was significantly reduced, while the diffusion properties demonstrated weak temperature dependence on solubility. The mechanism of the CO2 gas barrier of polymers filled with GO/LDH-Ca2Al was proposed on the basis of the Arrhenius equation.

Dataset Information

Optimizing the Properties of Hybrids Based on Graphene Oxide for Carbon Dioxide Capture.

Publications

Optimizing the Properties of Hybrids Based on Graphene Oxide for Carbon Dioxide Capture.

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