Chemistry of graphene oxide. Reactions with transition metal cations

Amirov, R. R.; Shayimova, Julia; Nasirova, Zarina; Dimiev, Ayrat M.

doi:10.1016/j.carbon.2017.01.095

Cited by 68 publications

(66 citation statements)

References 25 publications

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“…Only the two spectra for L−Pd‐GO and H−Pd‐GO are shown on Figure a for simplicity. In general, the change in the GO spectrum, associated with the reaction with Pd(NO 3 ) 2 ,⋅is exactly the same as we registered earlier for the reactions of GO with the salts of Mn 2+ , Gd 3+ and Fe 3+ . The fingerprint region of the spectrum changes completely (Figure a).…”

Section: Resultssupporting

confidence: 85%

“…Thus, Pd 2+ tightly bounds to GO functional groups, altering the fine chemical structure of GO. Based on the complete identity of the FTIR spectra for Pd‐GO (Figure a) with those reported earlier for Mn‐GO, Gd‐GO and Fe‐GO, we conclude that Pd 2+ cation forms a coordination compound, where GO′s functional groups serve as ligands, replacing water molecules from the first coordination sphere of the hydrated Pd 2+ cation.…”

Section: Resultssupporting

confidence: 81%

“…As will be shown below, upon reaction with Pd(NO 3 ) 2 , the fine chemical structure of GO undergoes the change similar to that for reactions with other transition metal cations such as Fe 3+ , Gd 3+ and Mn 2+ . Based on these similarities, below, we conclude that Pd evenly covers the GO surface due to the chemical bonding with oxygen functionalities.…”

Section: Resultsmentioning

confidence: 58%

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The Mechanistic Details for the Growth of Palladium Nanoparticles on Graphene Oxide Support

et al. 2017

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Composite materials, comprising metal nanoparticles (NP) on a structural support have gained significant attention as novel systems for catalysis and energy conversion. Despite the importance of these materials for practical applications, the mechanism of the NPs formation remains elusive. Here, we investigate the seeding and the growth of Pd‐NPs on graphene oxide (GO) support in the two‐step process: impregnation and annealing. During the impregnation step, Pd2+ uniformly covers GO surface due to the strong chemical bonding with the oxygen functional groups. During the thermal annealing step, the growth of Pd‐NPs occurs via the radial in‐plane migration of Pd‐NPs along the GO surface to incorporate new Pd atoms in a way, similar to the snowball effect. The exact migration path depends on the annealing temperature, and on the Pd/GO ratio. The same two factors are responsible for the size‐distribution and the lateral density of as‐grown Pd‐NPs. At high temperatures, diffusion of the growing Pd‐NPs across the GO layers complicates the picture. The annealing temperature also influences the crystallinity, or the degree of porosity of the graphenic support. Below 500°C, carbon planes remain almost intact, while above 700°C, GO decomposes into highly porous material.

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Section: Resultssupporting

confidence: 85%

Section: Resultssupporting

confidence: 81%

Section: Resultsmentioning

confidence: 58%

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The Mechanistic Details for the Growth of Palladium Nanoparticles on Graphene Oxide Support

et al. 2017

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“…The freeze-drying process used here depends on freezing the gel with the remaining liquid and following this process sublimation, which is controlled by decreased pressure above the sample. The prior freezing process can determine the pore structure [23][24][25][26], which will further influence the specific surface area, adsorption [27], mechanical strength, electrical conductivity and magnetic properties [28,29]. Figure 2a presents prGO hydrogels obtained via sol-gel technique.…”

Section: Partially Reduced Graphene Oxide Aerogelmentioning

confidence: 99%

“…Further purification cycles removed them completely. This ion removing process occurs only because of the reversibility of Mn-GO binding [29], differently than in the case of Fe-GO complexes [29]. Other reported in the literature method of obtaining GO without Mn contamination is done by the use of different oxidizing agents, e.g.…”

Section: Epr Spectroscopy Of Tmi-doped Prgo Aerogelsmentioning

confidence: 99%

Preparation and characterization of partially reduced graphene oxide aerogels doped with transition metal ions

et al. 2018

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This work presents the preparation and characterization of pristine and transition metal doped partially reduced graphene oxide aerogels. The step-by-step preparation of aerogels from graphene oxide with an assistance of VCl 3 , CrCl 3 , FeCl 2 Á4H 2 O, CoCl 2 , NiCl 2 and CuCl 2 chlorides as reducing agents is shown and explained. The influence of reducing agents on the structural and magnetic properties of prepared aerogels is investigated. The use of electron paramagnetic resonance in purification during synthesis of GO and characterization afterwards is shown. It was found that VCl 3 was the strongest reducing agent leading to the formation of the most dense reduced graphene oxide aerogel, whereas vanadium is visible in EPR spectrum in form of V 4? complex as a VO 2?groups.

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High Surface Area “3D Graphene Oxide” for Enhanced Sorption of Radionuclides

Boulanger

Kuzenkova

Iakunkov

et al. 2022

Adv Materials Inter

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Here preparation of high surface area activated reduced graphene oxide (arGO) oxidized into a 3D analogue of defect‐rich GO (dGO) is reported. Surface oxidation of arGO results in carbon to oxygen ratio C/O = 3.3, similar to the oxidation state of graphene oxide while preserving high BET surface area of about 880 m2 g−1. Analysis of surface oxidized arGO shows high abundance of oxygen functional groups which converts hydrophobic precursor into hydrophilic material. High surface area carbons provide the whole surface for oxidation without the need of intercalation and lattice expansion. Therefore, surface oxidation methods are sufficient to convert the materials into 3D architectures with chemical properties similar to graphene oxide. The “3D graphene oxide” shows high sorption capacity for U(VI) removal in an extraordinary broad interval of pH. Notably, the surface oxidized carbon material has a rigid 3D structure with micropores accessible for penetration of radionuclide ions. Therefore, the bulk “3D GO” can be used as a sorbent directly without dispersing, the step required for GO to make its surface area accessible for pollutants.

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Chemistry of graphene oxide. Reactions with transition metal cations

Cited by 68 publications

References 25 publications

The Mechanistic Details for the Growth of Palladium Nanoparticles on Graphene Oxide Support

The Mechanistic Details for the Growth of Palladium Nanoparticles on Graphene Oxide Support

Preparation and characterization of partially reduced graphene oxide aerogels doped with transition metal ions

High Surface Area “3D Graphene Oxide” for Enhanced Sorption of Radionuclides

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