Individual Ni atoms on reduced graphene oxide as efficient catalytic system for reduction of 4-nitrophenol

Svalova, Anna; Brusko, Vasiliy V.; Sultanova, Elza D.; Kirsanova, Maria A.; Khamidullin, Timur; Vakhitov, I. R.; Dimiev, Ayrat M.

doi:10.1016/j.apsusc.2021.150503

Cited by 17 publications

(27 citation statements)

References 41 publications

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“…In addition, the weight loss up to 120 °C is only ~0.5%, which indicates that water is practically not sorbed by the catalyst due to the hydrophobic nature of the surface. The weight loss above 300 °C can be associated with the decomposition of the remaining oxygen-containing groups, which is also typical for the r GO/Ni composite [ 12 ]. Most likely, these oxygen-containing groups participated in the coordination of Ni 2+ ions [ 12 ].…”

Section: Resultsmentioning

confidence: 99%

“…The weight loss above 300 °C can be associated with the decomposition of the remaining oxygen-containing groups, which is also typical for the r GO/Ni composite [ 12 ]. Most likely, these oxygen-containing groups participated in the coordination of Ni 2+ ions [ 12 ].…”

Section: Resultsmentioning

confidence: 99%

“…Since the reduction of p -nitrophenol without a catalyst does not occur due to the high kinetic barrier [ 11 ], there is constant interest in the design of efficient and inexpensive catalysts that would help to purify industrial wastewater. In recent years, the reduction of p -nitrophenol has become a benchmark reaction for testing various novel catalytic systems for the simplicity of monitoring the reaction progress [ 9 , 12 ].…”

Section: Introductionmentioning

confidence: 99%

“…In a series of our recent publications, we have demonstrated the possibility of coordinating several metal cations such as Gd 3+ , Fe 3+ , Mn 2+ , Sr 2+ , Cs + , etc., with GO in aqueous solutions [ 26 , 27 ]. Based on this property of GO, in our previous work [ 12 ], we synthesized a new catalytic system, comprising individual Ni atoms-ions on reduced GO support, which demonstrated remarkable results in the reaction of reducing p -nitrophenol. Importantly, nickel on the RGO surface existed in the form of single atoms-ions, being strongly coordinated by the oxygen groups of GO, due to its specific chemistry.…”

Section: Introductionmentioning

confidence: 99%

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Nickel on Oxidatively Modified Carbon as a Promising Cost-Efficient Catalyst for Reduction of P-Nitrophenol

et al. 2022

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The reduction of p-nitrophenol to p-aminophenol has become a benchmark reaction for testing the efficiency of new catalytic systems. In this study, we use oxidatively modified carbon (OMC) as a structural support to develop a new cost-efficient nickel-based catalytic system. The newly developed material comprises single nickel ions, chemically bound to the oxygen functional groups on the OMC surface. The highly oxidized character of OMC ensures the high lateral density of nickel ions on its surface at relatively low nickel content. We demonstrate excellent catalytic properties of the new material by using it as a stationary phase in a prototype of a continuous flow reactor: the reagent fed into the reactor is p-nitrophenol, and the product, exiting the reactor, is the fully converted p-aminophenol. The catalytic properties of the new catalyst are associated with its specific morphology, and with high lateral density of active sites on the surface. The reaction can be considered as an example of single-atom catalysis. The resulting material can be used as an inexpensive but efficient catalyst for industrial wastewater treatment. The study opens the doors for the synthesis of a new series of catalytic systems comprising transition metal atoms on the OMC structural support.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Nickel on Oxidatively Modified Carbon as a Promising Cost-Efficient Catalyst for Reduction of P-Nitrophenol

et al. 2022

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“…Graphene oxide (GO) was prepared through the modified Hummers method, with the modification, developed in our laboratories, and used in most of our recent studies. ,, Then, GO was transferred from an aqueous media to an isopropanol dispersion. The transfer procedure involves gradual replacement of water by isopropanol via repeated redispersion and precipitation, as described elsewhere. ,, The synthesis of iron oxide nanoparticles (IONP) was carried out according to the procedure described in recent works. , The original IONPs were obtained in the form of the dispersion in hexane with the concentration of 6 wt %.…”

Section: Methodsmentioning

confidence: 99%

Graphene Oxide–Epoxy Composites with Induced Anisotropy of Electrical Properties

et al. 2021

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At present day, the actual physics behind the polarization mechanism in composite materials remains elusive. In this study, we introduce graphene oxide sheets, decorated with iron oxide nanoparticles (GO-IONP), into epoxy resin, and orient them unidirectionally by using an external magnetic field. The GO-IONP sheets are oriented perpendicular to the magnetic field lines. The as-prepared epoxy/GO-IONP composites possess well-pronounced anisotropy in electric properties: at 0.4% GO, in the direction perpendicular to the GO-IONP planes, permittivity augmentation reaches the value of 17.8, while in the other two orthogonal directions it is ∼6.8. The attained permittivity values at the 0.1−0.4% GO content are the highest ever reported for the epoxy matrix/graphenic filler systems. Such characteristics are due to the fully uniform structure of the composites, where the filler with atomic thickness does not form a distinct phase. The material can be considered as a system, comprising a series of orderly arranged microcapacitors, with the "plates" of atomic thickness, but of a micron-scale lateral size. The data demonstrates that the charge can be stored on a capacitor with the "plates", lacking one dimension. The physics behind electrical conductivity of the composite materials is defined as the interfacial polarization. The developed protocol opens the doors for fabricating anisotropic materials, films, and coatings, which are highly desirable for antennas, radars, vibration sensors, dielectric lenses, etc.

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Single Metal Atoms Anchored on N‐Doped Holey Graphene as Efficient Dual‐Active‐Component Catalysts for Nitroarene Reduction

Hu,

Liu,

Cao

et al. 2023

Adv Funct Materials

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Developing efficient catalysts for facilitating organic synthesis processes is a popular but challenging topic in modern chemical industries. A combination of active metals and an active support structure is, in theory, an effective strategy for boosting catalytic activity but such combinations have been rarely explored. Herein, a strategy for fabricating highly efficient dual‐active‐component catalysts (DACCs) is presented by anchoring single‐atom metals (M1; e.g., Pd1, Ni1, Co1, and Zn1) or double‐atomic metals (e.g., Pd1‐Co1, Pd1‐Ru1, and Pd1‐Ni1) on nitrogen‐doped holey graphene (NHG). Among the resultant DACCs, Pd1/NHG, which combines atomically dispersed metal species and an active NHG carbocatalyst, has been shown to display enhanced catalytic performance toward nitroarene reduction . In particular, its catalytic efficiency in reducing 4‐nitrophenol corresponds to a turnover frequency of 2.0 min−1, which is 97 times higher than the benchmark set by commercial Pd/C catalysts (5.0 wt.%), and vastly superior to those of its counterparts (e.g., NHG carbocatalyst and NHG supported Pd clusters. Notably, four intermediates and two active components (i.e., NHG and single‐atom Pd) in the nitroarene reduction process have been identified. This study presents an effective and versatile synthetic strategy to prepare DACCs through the combination of metallic catalysts and a carbocatalyst substrate.

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Individual Ni atoms on reduced graphene oxide as efficient catalytic system for reduction of 4-nitrophenol

Cited by 17 publications

References 41 publications

Nickel on Oxidatively Modified Carbon as a Promising Cost-Efficient Catalyst for Reduction of P-Nitrophenol

Nickel on Oxidatively Modified Carbon as a Promising Cost-Efficient Catalyst for Reduction of P-Nitrophenol

Graphene Oxide–Epoxy Composites with Induced Anisotropy of Electrical Properties

Single Metal Atoms Anchored on N‐Doped Holey Graphene as Efficient Dual‐Active‐Component Catalysts for Nitroarene Reduction

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