One-step synthesis of magnetically recyclable Co@BN core–shell nanocatalysts for catalytic reduction of nitroarenes

Du, Miao; Liu, Min; Huang, Caijin; Qiu, Xiaoqing

doi:10.1039/c7ra04907b

Cited by 30 publications

(18 citation statements)

References 75 publications

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“…Significantly, dye degradation due to catalytic activity demonstrated best results in an alkaline environment which favorably supports our experimental findings. Several reports reveal that the highest dye degradation by catalytic activity was observed in an alkaline environment [61].…”

Section: Degradationmentioning

confidence: 99%

Application of Chemically Exfoliated Boron Nitride Nanosheets Doped with Co to Remove Organic Pollutants Rapidly from Textile Water

et al. 2020

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Two-dimensional layered materials doped with transition metals exhibit enhanced magnetization and improved catalytic stability during water treatment leading to potential environmental applications across several industrial sectors. In the present study, cobalt (Co)-doped boron nitride nanosheets (BN-NS) were explored for such an application. Chemical exfoliation process was used to exfoliate BN-NS and the hydrothermal route was adopted to incorporate Co dopant in various concentrations (e.g., 2.5, 5, 7.5, and 10 wt%). X-ray diffraction (XRD) study indicated that crystallinity improved upon doping with the formation of a hexagonal phase of the synthesized material. Selected area electron diffraction (SAED) confirmed enhanced crystallinity, which corroborates XRD results. Interlayer spacing was evaluated through a high-resolution transmission electron microscope (HR-TEM) equipped with Gatan digital micrograph software. Compositional and functional group analysis was undertaken with energy dispersive Xray (EDS) and Fourier transform infrared (FTIR) spectroscopy, respectively. Field emission scanning electron microscope (FE-SEM) and HR-TEM were utilized to probe surface morphologies of prepared samples. Bonding modes in the sample were identified through Raman analysis. Optical properties were examined using UV-vis spectroscopy. Photoluminescence spectra were acquired to estimate the separation and recombination of excitons. Magnetic properties were studied by means of hysteresis loop acquired using VSM measurements. Methylene blue dye was degraded with as-prepared host and doped nanosheets used as catalysts and investigated through absorption spectra ranging from 250 to 800 nm. The experimental results of this study indicate that Co-doped BN-NS showed enhanced magnetic properties and can be used to degrade dyes present as an effluent in industrial wastewater.

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Section: Degradationmentioning

confidence: 99%

Application of Chemically Exfoliated Boron Nitride Nanosheets Doped with Co to Remove Organic Pollutants Rapidly from Textile Water

et al. 2020

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“…Subsequently, the chemisorption of 4‐NP onto carbon support occurs, causing the electrons and hydrogen species liberated from NaBH 4 to be carried to the nitrogen of the nitro group of 4‐NP to the carbon support. It can be observed that both reactants are adsorbed to the surface of the catalyst prior to the reaction, following the L‐H mechanism [74] . A transition surface complex of 4‐hydroxyl aminophenol is formed due to the transfer of electrons and active H species.…”

Section: Resultsmentioning

confidence: 99%

Synthesis and Characterization of a Carbon‐Supported Cobalt Nitride Nano‐Catalyst

et al. 2022

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Transition metal nitrides have attracted great interest among the non‐noble catalysts employed in heterogeneous catalytic processes because of their exceptional stability and catalytic potential. However, the approach for their synthesis has remained a tremendous challenge. This study presents the synthesis of Co4N/C catalyst fabricated at 400, 600, and 800 °, symbolized as Co4N/C‐400, Co4N/C‐600, Co4N/C‐800, respectively. The characterization of fabricated catalysts is carried out through various advanced analytical techniques. As prepared nano‐catalyst Co4N/C shows remarkable catalytic efficiency in terms of low activation energy (Ea=3.038×10−1 KJ mol−1), fast conversion rate (Kapp=0.2884 s−1), and 97.57% conversion efficiency. Moreover, it also exhibits excellent stability and reusability because of its metallic characteristics. The outstanding catalytic activity of the catalyst is the combined effect in which the Co4N nanoparticles acted as active sites, and the carbon support doped with nitrogen provided an expressway for the transport of electrons required for catalytic reduction. Moreover, the designed catalyst is immobilized on the cellulose membrane filter support, to demonstrate the catalytic reduction of 4‐nitrophenol to 4‐aminophenol. We envision that our work would facilitate the fabrication of cobalt nitrides‐based nano‐catalysts for a wide range of industrial applications.

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“…Similarly, Zhang et al 92 prepared Pt−Pd nanoalloys supported on Fe 3 O 4 @C core−shell NPs using a facile two-step synthesis method (Figure 19) and characterized them by high-resolution TEM; Pt−Pd nanocatalyst decoration on a carbon layer coating on the surface of the Fe 3 O 4 NPs was discerned. In another exploration, Du et al 93 synthesized Pt−Pd NPs on super-paramagnetic core−shell nanocatalysts for the reduction of 4-NP to 4-AP using aqueous NaBH 4 . The hydrogenation required 22 min to completely convert the 4-NP to 4-AP using 13.63 wt % of the prepared nanocatalysts; the yield and selectivity were obtained to be 96% and 99%, respectively.…”

Section: Supported Magnetic Nanocatalystsmentioning

confidence: 99%

Recent Advances in the Nanocatalyst-Assisted NaBH₄ Reduction of Nitroaromatics in Water

et al. 2019

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In view of the increasing applications of nanocatalysis in chemical transformations, this article illustrates recent advances on the use of nanocatalysts for an important reduction reaction, the hydrogenation of nitroaromatics to significant aminoaromatics with aqueous NaBH 4 solution; the utility of mono- and multimetal nanocatalysts with special emphasis on heterogeneous nanocatalysts is included. A progressive trend on the applicability of nanocatalysts is also incorporated with large-scale application and their sustainable recyclization and reuse utilizing supported and magnetic nanocatalysts; representative methods for the synthesis of such reusable nanocatalysts are featured.

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One-step synthesis of magnetically recyclable Co@BN core–shell nanocatalysts for catalytic reduction of nitroarenes

Abstract: The possible mechanism for Co@BN catalyzed 4-nitrophenol reduction in the presence of NaBH4. Moreover, the 13.6 wt% Co@BN core–shell nanoparticles exhibited the excellent catalytic activity in hydrogenation of nitroaromatic compounds.

Cited by 30 publications

References 75 publications

Application of Chemically Exfoliated Boron Nitride Nanosheets Doped with Co to Remove Organic Pollutants Rapidly from Textile Water

Application of Chemically Exfoliated Boron Nitride Nanosheets Doped with Co to Remove Organic Pollutants Rapidly from Textile Water

Synthesis and Characterization of a Carbon‐Supported Cobalt Nitride Nano‐Catalyst

Recent Advances in the Nanocatalyst-Assisted NaBH₄ Reduction of Nitroaromatics in Water

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One-step synthesis of magnetically recyclable Co@BN core–shell nanocatalysts for catalytic reduction of nitroarenes

Abstract: The possible mechanism for Co@BN catalyzed 4-nitrophenol reduction in the presence of NaBH4. Moreover, the 13.6 wt% Co@BN core–shell nanoparticles exhibited the excellent catalytic activity in hydrogenation of nitroaromatic compounds.

Cited by 30 publications

References 75 publications

Application of Chemically Exfoliated Boron Nitride Nanosheets Doped with Co to Remove Organic Pollutants Rapidly from Textile Water

Application of Chemically Exfoliated Boron Nitride Nanosheets Doped with Co to Remove Organic Pollutants Rapidly from Textile Water

Synthesis and Characterization of a Carbon‐Supported Cobalt Nitride Nano‐Catalyst

Recent Advances in the Nanocatalyst-Assisted NaBH4 Reduction of Nitroaromatics in Water

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Recent Advances in the Nanocatalyst-Assisted NaBH₄ Reduction of Nitroaromatics in Water