A new approach to the economic synthesis of multi-walled carbon nanotubes using a Ni/MgO catalyst

Ali, Imran; AlGarni, Tahani Saad; Burakova, Elena; Ткачев, А. Г.; Туголуков, Е. Н.; Dyachkova, T. P.; Рухов, А. В.; Gutnik, Irina; Galunin, Evgeny

doi:10.1016/j.matchemphys.2021.124234

Cited by 8 publications

(8 citation statements)

References 44 publications

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“…-Multi-walled carbon nanotubes: MWCNTs are prepared by rolling up multiple layers of graphene sheets on themselves (Ali et al, 2021). Based on the number of graphene tubes being rolled up, MWCNT diameter varies from 2 to 50 nm (Ibrahim, 2013).…”

Section: Carbon Nanotubesmentioning

confidence: 99%

Recent Developments in the Immobilization of Laccase on Carbonaceous Supports for Environmental Applications - A Critical Review

Adamian

Lonappan

Alokpa

et al. 2021

Front. Bioeng. Biotechnol.

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Τhe ligninolytic enzyme laccase has proved its potential for environmental applications. However, there is no documented industrial application of free laccase due to low stability, poor reusability, and high costs. Immobilization has been considered as a powerful technique to enhance laccase’s industrial potential. In this technology, appropriate support selection for laccase immobilization is a crucial step since the support could broadly affect the properties of the resulting catalyst system. Through the last decades, a large variety of inorganic, organic, and composite materials have been used in laccase immobilization. Among them, carbon-based materials have been explored as a support candidate for immobilization, due to their properties such as high porosity, high surface area, the existence of functional groups, and their highly aromatic structure. Carbon-based materials have also been used in culture media as supports, sources of nutrients, and inducers, for laccase production. This study aims to review the recent trends in laccase production, immobilization techniques, and essential support properties for enzyme immobilization. More specifically, this review analyzes and presents the significant benefits of carbon-based materials for their key role in laccase production and immobilization.

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Section: Carbon Nanotubesmentioning

confidence: 99%

Recent Developments in the Immobilization of Laccase on Carbonaceous Supports for Environmental Applications - A Critical Review

Adamian

Lonappan

Alokpa

et al. 2021

Front. Bioeng. Biotechnol.

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“…A small peak observed at 2933 cm -1 is known to be a characteristic of the presence of CNTs. Here, the presence of G' band supports the higher fraction of CNTs in Ni-MgO/CNT than in MgO/CNT (green), although more defects were introduced in CNT of Ni-MgO/CNT[28][29][30][31][32] because of its faster growth facilitated by the catalytic function of Ni.…”

mentioning

confidence: 70%

“…The ID/IG in Figure2was estimated with values of 2.11 and 0.97 for Ni-MgO/CNT and MgO/CNT electrocatalyst respectively. Transient metals such as Fe, Co, and Ni are commonly used as the catalyst for the CNT synthesis[28][29][30][31][32]. The G-band to D-band relative intensity ratio is greater in Ni-MgO/CNT, indicating more defects in the synthesized Ni-MgO/CNT compared to those in MgO/CNT.…”

mentioning

confidence: 99%

Facile Synthesis of Ni-MgO/CNT Nanocomposite for Hydrogen Evolution Reaction

Mohana,

Isacfranklin,

Yuvakkumar

et al. 2023

Preprint

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In this study, the pristine MgO, MgO/CNT and Ni-MgO/CNT nanocomposites were processed by the impregnation and chemical vapour deposition methods and analyzed for hydrogen evolution (HER) via electrochemical water splitting process. Furthermore, effect of nickel on the deposited carbon was systematically elaborated in this study. The highly conductive carbon nanotubes (CNTs) deposited on the metal surface of the Ni-MgO nanocomposite heterostructure provides the robust stability and superior electrocatalytic activity. The optimized Ni-MgO/CNT nanocomposite exhibited hierarchical helical-shaped carbon nanotubes adorned on the surface of the Ni-MgO flakes, forming a hybrid metal-carbon network structure. The HER catalytic reaction was carried out in 1M alkaline KOH electrolyte, and the optimized Ni-MgO/CNT nanocomposite achieves the low 117 mV overpotential value (ɳ) at the 10 mA cm-2 and needs low 116 mV/dec Tafel value denoted Volmer-Heyrovsky pathway. Also, high electrochemical active surface area (ECSA) value of Ni-MgO/CNT nanocomposite acquires 515 cm2, which is favorable for the generation of abundant electro-active species and the prepared electrocatalyst durability was also performed by chronoamperometry test for prolonged duration of 20 h at 10 mA cm-2 and exhibits the good stability with 72% retention. Hence, obtained results demonstrated that the optimized Ni-MgO/CNT nanocomposite is highly active and cost-effective electrocatalyst towards hydrogen energy production.

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“…The catalysts for the preparation of CNTs by CVD are powder materials, usually active metal particles (Fe, 30 Co, 31 Ni, 32 etc. ) loaded onto an inert matrix (MgO, 32,33 Al 2 O 3 , 34 SiO 2 , 35 etc. ) with a specific morphology.…”

Section: Introductionmentioning

confidence: 99%

High-rate carbon nanotube/magnetic-sheet composites in situ synthesized using a fluidized bed for high-frequency microwave absorption

Xu,

Sun,

Liang

et al. 2024

New J. Chem.

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A new approach to the economic synthesis of multi-walled carbon nanotubes using a Ni/MgO catalyst

Cited by 8 publications

References 44 publications

Recent Developments in the Immobilization of Laccase on Carbonaceous Supports for Environmental Applications - A Critical Review

Recent Developments in the Immobilization of Laccase on Carbonaceous Supports for Environmental Applications - A Critical Review

Facile Synthesis of Ni-MgO/CNT Nanocomposite for Hydrogen Evolution Reaction

High-rate carbon nanotube/magnetic-sheet composites in situ synthesized using a fluidized bed for high-frequency microwave absorption

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