Understanding the Adsorption Capacity for CO2 in Reduced Graphene Oxide (rGO) and Modified Ones with Different Heteroatoms in Relation to Surface and Textural Characteristics

Politakos, Nikolaos; Cordero-Lanzac, Tomás

doi:10.3390/app11209631

Cited by 4 publications

(4 citation statements)

References 45 publications

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“…This excellent adsorption performance is attributed to increased surface area at higher reduction temperatures, owing to the significant removal of oxygen functional groups and increased pore volume. After removing surcial oxygen functionalities, graphene's sp 2 - hybridized structure was partially restored at 250 °C 41 , 42 .…”

Section: Resultsmentioning

confidence: 99%

Photocatalytic degradation of organic dyes using reduced graphene oxide (rGO)

Shabil Sha,

Anwar,

Musthafa

et al. 2024

Sci Rep

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Photocatalysts have developed into a successful strategy for degrading synthetic and organic toxins, such as chemicals and dyes, in wastewater. In this study, graphene oxide was reduced at different temperatures and used for degrading indigo carmine and neutral red dyes. The wide surface areas, strong adsorption sites, and oxygen functionalities of reduced graphene oxide (rGO) at 250 °C (rGO-250) produced more photocatalytic degradation efficiency and adsorption percentage. The catalyst dosage, initial dye concentration, solution pH and recyclability were all used to optimize the photocatalytic activity of rGO-250. This research presents a capable nano-adsorbent photocatalyst for the efficient degradation of organic dyes. GO and rGOs were also investigated for carbon dioxide (CO2) absorption properties. Results showed that rGO-250 has better CO2 adsorption properties than other rGOs. Overall, it was observed that rGO-250 has better photocatalytic and CO2 adsorption capabilities compared to graphene oxide reduced at different temperatures.

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Section: Resultsmentioning

confidence: 99%

Photocatalytic degradation of organic dyes using reduced graphene oxide (rGO)

Shabil Sha,

Anwar,

Musthafa

et al. 2024

Sci Rep

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“…Graphene oxide, including reduced graphene oxide and its various modifications, is a group of materials with a wide range of applications, especially for CO 2 adsorption. In order to improve the properties of this material, the possibilities of its functionalization with various heteroatoms (Si, S, N, O) containing compounds have been studied, as a result of which materials with increased porosity and surface area are obtained [108]. The surface areas (BET) of reduced graphene oxides and modified graphene oxides studied by Politakos [108] are in the range of 70-351 m 2 /g, and their CO 2 adsorption capacities are in the range of 0.47-1.67 mmol/g (25 • C, atmospheric pressure).…”

Section: Carbon Dioxide Adsorption Onto Mof-composite Adsorbentsmentioning

confidence: 99%

“…In order to improve the properties of this material, the possibilities of its functionalization with various heteroatoms (Si, S, N, O) containing compounds have been studied, as a result of which materials with increased porosity and surface area are obtained [108]. The surface areas (BET) of reduced graphene oxides and modified graphene oxides studied by Politakos [108] are in the range of 70-351 m 2 /g, and their CO 2 adsorption capacities are in the range of 0.47-1.67 mmol/g (25 • C, atmospheric pressure). Thus, it can be concluded that raw biochar is an equivalent CO 2 adsorbent, as it shows similar CO 2 adsorption capacities, which can be increased by forming composites with, for example, CuBTC or UiO-66-BTEC.…”

Section: Carbon Dioxide Adsorption Onto Mof-composite Adsorbentsmentioning

confidence: 99%

Metal–Organic Frameworks (MOFs) Containing Adsorbents for Carbon Capture

2022

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In this study, new composite materials of montmorillonite, biochar, or aerosil, containing metal–organic frameworks (MOF) were synthesized in situ. Overall, three different MOFs—CuBTC, UTSA-16, and UiO-66-BTEC—were used. Obtained adsorbents were characterized using powder X-ray diffraction, thermogravimetric analysis, nitrogen adsorption porosimetry, scanning electron microscopy, energy-dispersive X-ray spectroscopy, and Fourier transform infrared spectrophotometry. Additionally, the content of metallic and nonmetallic elements was determined to investigate the crystalline structure, surface morphology, thermal stability of the obtained MOF-composites, etc. Cyclic CO2 adsorption analysis was performed using the thermogravimetric approach, modeling adsorption from flue gasses. In our study, the addition of aerosil to CuBTC (CuBTC-A-15) enhanced the sorbed CO2 amount by 90.2% and the addition of biochar (CuBTC-BC-5) increased adsorbed the CO2 amount by 75.5% in comparison to pristine CuBTC obtained in this study. Moreover, the addition of montmorillonite (CuBTC-Mt-15) increased the adsorbed amount of CO2 by 27%. CuBTC-A-15 and CuBTC-BC-5 are considered to be the most perspective adsorbents, capturing 3.7 mmol/g CO2 and showing good stability after 20 adsorption-desorption cycles.

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“…Graphene oxide has been reported as an efficient adsorbate for acid gases due to the high surface area it provides and stable chemical structure . Some researchers have investigated the physisorption of CO 2 on graphene oxide (GO), reduced graphene oxide (rGO), and amine-functionalized graphene oxide. , One advantage of the GO structure is that it consists of oxygen-rich groups such as hydroxide and epoxide groups attached to the surface and carboxyl and carbonyl groups on the edges. These oxygen-rich functional groups are the common reaction sites for a wide range of chemical reactions …”

Section: Introductionmentioning

confidence: 99%

Graphene Oxide Enhanced Monoethanolamine and Ethylenediamine Nanofluids for Efficient Carbon Dioxide Uptake from Flue Gas

Khumalo,

Mahlangu,

Mamba

et al. 2024

ACS Omega

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The addition of nanoparticles in amine solutions to produce a stable amine-based nanofluid provides a high surface area for absorption and improves the absorption rate. In this work, nanofluids were prepared by dispersing graphene oxide (GO) in monoethanolamine (MEA) and ethylenediamine (EDA) solutions for adsorption of carbon dioxide (CO 2 ) to further improve their absorption performance by providing more reaction sites on the GO framework. GO was synthesized using the modified Hummers method and characterized for physicochemical properties using SEM, EDS, FTIR, Raman analysis, and TGA. The FTIR spectra for the GO nanoparticles before absorption showed peaks attributed to C−C, H−C, and C−O bonding. After the absorption experiments, the FTIR spectra of GO showed peaks due to C−O−NH 2 , N−O−N, and N−H bonding. The BET analysis further confirmed the decrease in the surface area, pore volume, and pore diameter of the GO recovered from the nanofluids after the CO 2 experiment, indicating an interaction between GO and amine molecules. The absorption process of CO 2 by the nanofluid was performed in a custom-made pressure chamber whereby the CO 2 gas was in direct contact with the absorption fluids. The obtained adsorption rate constant (k) for the reaction between CO 2 and 30% MEA and EDA solutions was 0.113 and 0.131, respectively. Upon addition of 0.2 mg/mL GO in the base solution, k increased to 0.16854 and 0.17603 for the MEA and EDA nanofluids, respectively. The proposed mechanism involves GO nanoparticles interacting with the amine groups through the oxygen-rich groups of GO. This results in the formation of a zwitterion that readily reacts with CO 2 , resulting in a carbamate.

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Understanding the Adsorption Capacity for CO2 in Reduced Graphene Oxide (rGO) and Modified Ones with Different Heteroatoms in Relation to Surface and Textural Characteristics

Cited by 4 publications

References 45 publications

Photocatalytic degradation of organic dyes using reduced graphene oxide (rGO)

Photocatalytic degradation of organic dyes using reduced graphene oxide (rGO)

Metal–Organic Frameworks (MOFs) Containing Adsorbents for Carbon Capture

Graphene Oxide Enhanced Monoethanolamine and Ethylenediamine Nanofluids for Efficient Carbon Dioxide Uptake from Flue Gas

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