Low temperature synthesis of NbC/C nano-composites as visible light photoactive catalyst

Gupta, Aayush; Mittal, Manish; Singh, Mahesh Kumar; Suib, Steven L.; Pandey, O.P.

doi:10.1038/s41598-018-31989-z

Cited by 98 publications

(28 citation statements)

References 79 publications

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“…Whereas in the presence of the nanohybrid catalyst, the LC−MS spectra obtained during the course (time intervals 0−5 min) of the reaction showed gradual fragmentation of peaks and led to small molecules of 74 and 81 Da at the end of the reaction. The possible degradation products are provided in Figure S12 of the Supporting Information, and the observed fragmentation molecules match well with the previous reports. − …”

Section: Resultssupporting

confidence: 89%

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Synergistic Effects of Carbon Dots and Palladium Nanoparticles Enhance the Sonocatalytic Performance for Rhodamine B Degradation in the Absence of Light

et al. 2020

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Carbon dot (CD) and palladium nanoparticle (Pd NP) composites are semiconducting materials having tremendous applications in catalysis with suitable band gaps. However, their combination with a suitable polymer matrix in sonophotocatalysis has not been explored. Herein, we have synthesized and characterized a new nanohybrid catalyst from a polyamide cross-linked CD-polymer and subsequent deposition of Pd NPs. A sonocatalytic activity of 99% rhodamine B dye degradation was achieved in mere 5 min in the dark. A model catalyst replacing CDs with benzene and other control studies revealed that the synergistic effects of CDs and Pd NPs enhance the sonocatalytic activity of the nanohybrid catalyst. Interestingly, visible light did not influence the activity significantly. Mechanistic investigations suggest that generation of reactive oxygen species on the surface of the CD–polymer initiated by ultrasound, which is further facilitated by Pd NPs, is the key for remarkable catalytic activity (a rate constant of 0.99 min –1 ). Recyclable heterogeneous catalysts under ambient conditions are promising for exploring sono-assisted dark catalysis for several avenues.

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Section: Resultssupporting

confidence: 89%

“…The possible degradation products are provided in Figure S12 of the Supporting Information , and the observed fragmentation molecules match well with the previous reports. 53 − 56 …”

Section: Resultsmentioning

confidence: 99%

Synergistic Effects of Carbon Dots and Palladium Nanoparticles Enhance the Sonocatalytic Performance for Rhodamine B Degradation in the Absence of Light

et al. 2020

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“…The NbC precipitates contribution is found again on the Nb 3d spectra (Figs.2g and 3g) convoluted with other Nb oxide species due to spin-orbit split ting (�E Nb 3d � 2.7 eV)[50]. Gupta et al demonstrated that NbC compounds present complex oxide layers at different oxidation degrees in the case of NbC nanocomposites[51]. Based on this work, the Nb 3d spectra were decomposed in three components (six peaks for 3d 5 1 2 and 3d 3 ; 2 ) corresponding respectively to NbC precipitates at lower BE values, a mixture of carbide-oxide NbCxO y and Nb 1v 0 2 oxide at higher BE values for all samples studied.…”

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confidence: 87%

Combined XPS / TEM study of the chemical composition and structure of the passive film formed on additive manufactured 17-4PH stainless steel

Barroux

Duguet

Ducommun

et al. 2021

Surfaces and Interfaces

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“…Both contributions can be found in all CO/H 2 treated films, indicating that regardless of the initial iron oxide phase, a significant contribution of a carbide phase in the surface region can be deduced. Except for the contributions assigned to iron carbides and iron oxide, several prominent features in the spectra can be assigned to graphitic carbon (284.8 eV), surface hydroxylated carbon (286.3 eV) and surface oxidation (298.1 eV) in every C 1s spectra [34,35]. In the O 1s spectrum, two peaks assignable to C-O (531.9 eV) and -OH (533.1 eV) can be observed and are well-known from other iron oxide materials [36].…”

Section: Review 4 Of 11mentioning

confidence: 99%

Influence of Phase Composition and Pretreatment on the Conversion of Iron Oxides into Iron Carbides in Syngas Atmospheres

Arinchtein

Geske

et al. 2021

Catalysts

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CO2 Fischer–Tropsch synthesis (CO2–FTS) is a promising technology enabling conversion of CO2 into valuable chemical feedstocks via hydrogenation. Iron–based CO2–FTS catalysts are known for their high activities and selectivities towards the formation of higher hydrocarbons. Importantly, iron carbides are the presumed active phase strongly associated with the formation of higher hydrocarbons. Yet, many factors such as reaction temperature, atmosphere, and pressure can lead to complex transformations between different oxide and/or carbide phases, which, in turn, alter selectivity. Thus, understanding the mechanism and kinetics of carbide formation remains challenging. We propose model–type iron oxide films of controlled nanostructure and phase composition as model materials to study carbide formation in syngas atmospheres. In the present work, different iron oxide precursor films with controlled phase composition (hematite, ferrihydrite, maghemite, maghemite/magnetite) and ordered mesoporosity are synthesized using the evaporation–induced self–assembly (EISA) approach. The model materials are then exposed to a controlled atmosphere of CO/H2 at 300 °C. Physicochemical analysis of the treated materials indicates that all oxides convert into carbides with a core–shell structure. The structure appears to consist of crystalline carbide cores surrounded by a partially oxidized carbide shell of low crystallinity. Larger crystallites in the original iron oxide result in larger carbide cores. The presented simple route for the synthesis and analysis of soft–templated iron carbide films will enable the elucidation of the dynamics of the oxide to carbide transformation in future work.

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Low temperature synthesis of NbC/C nano-composites as visible light photoactive catalyst

Cited by 98 publications

References 79 publications

Synergistic Effects of Carbon Dots and Palladium Nanoparticles Enhance the Sonocatalytic Performance for Rhodamine B Degradation in the Absence of Light

Synergistic Effects of Carbon Dots and Palladium Nanoparticles Enhance the Sonocatalytic Performance for Rhodamine B Degradation in the Absence of Light

Combined XPS / TEM study of the chemical composition and structure of the passive film formed on additive manufactured 17-4PH stainless steel

Influence of Phase Composition and Pretreatment on the Conversion of Iron Oxides into Iron Carbides in Syngas Atmospheres

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