Preparation of boron carbide nanosheets with high neutron-shielding properties based on reduced graphene oxide aerogel

Liu, Yajing; Tian, Qiang; Wang, Shanqiang; Li, Zhaoqian; Duan, Xiaohui; Que, Longkun; Pei, Chonghua

doi:10.1016/j.ceramint.2020.04.134

Cited by 11 publications

(3 citation statements)

References 44 publications

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“…105528 and 1410 cm −1 ,29 were observed in BTA catalysts, which further proved the successful introduction of the boron element. The crystal plane and crystal form were analyzed by X-ray diffraction (XRD), as shown in FigureS2f.…”

mentioning

confidence: 58%

“…As shown in Figure S2d and Table S3, the characteristic peaks of C and O elements appeared in TA and BTA catalysts, and the additional characteristic peaks of B element appeared in the BTA catalyst. As shown in Figure S2e, compared with the TA catalyst, B–C and B–O characteristic peaks, corresponding to 1055 and 1410 cm –1 , were observed in BTA catalysts, which further proved the successful introduction of the boron element. The crystal plane and crystal form were analyzed by X-ray diffraction (XRD), as shown in Figure S2f.…”

Section: Results and Discussionmentioning

confidence: 99%

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Boron Bifunctional Catalysts for Rapid Degradation of Persistent Organic Pollutants in a Metal-Free Electro-Fenton Process: O₂ and H₂O₂ Activation Process

Chen,

Wang,

Sun

et al. 2023

Environ. Sci. Technol.

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Metals usually served as the active sites of the heterogeneous bifunctional electro-Fenton reaction, which faced the challenge of poor stability under acidic or even neutral conditions. Exploring a metal-free heterogeneous bifunctional electro-Fenton catalyst can effectively solve the above problems. In this work, a stable metal-free heterogeneous bifunctional boron-modified porous carbon catalyst (BTA-1000) was synthesized. For the BTA-1000 catalyst, the yield of H 2 O 2 (294 mg/L) significantly increased. The degradation rate of phenol by BTA-1000 (0.242 min −1 ) increased by an order of magnitude, compared with the porous carbon catalyst (0.0105 min −1 ). The BTA catalyst could rapidly degrade industrial dye wastewater, and its specific energy consumption was 5.52 kW h kg −1 COD −1 , lower than that in previous reports (6.38−7.4 kW h kg −1 COD −1 ). DFT and XPS revealed that C�O and −BC 2 O groups jointly promoted the generation of H 2 O 2 , and the −BCO 2 group played dominant roles in the generation of • OH because the oxygen atom near the electron-giving groups (−BCO 2 group) facilitated the formation of hydrogen bond and H 2 O 2 adsorption. This work gained deep insights into the reaction mechanism of the boron-modified porous carbon catalyst, which helped to guide the development of metal-free heterogeneous bifunctional electro-Fenton catalysts.

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confidence: 58%

Section: Results and Discussionmentioning

confidence: 99%

Boron Bifunctional Catalysts for Rapid Degradation of Persistent Organic Pollutants in a Metal-Free Electro-Fenton Process: O₂ and H₂O₂ Activation Process

Chen,

Wang,

Sun

et al. 2023

Environ. Sci. Technol.

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“…The boron carbide is a low density material of 2.51 g/cm 3 with rhombohedral crystallographic structure including a high melting point of about 2400 °C, very high hardness of 38 GPa, a good elastic, excellent wear and mechanical properties, and high neutron absorption cross section [ 1 , 2 , 3 , 4 ]. Due to these properties, it is widely used as sand blasting nozzles, armor plates, sliding rings, neutron-shielding materials in nuclear industry, milling agents, grinding material, hard coatings, and also boron neutron capture therapy (BNCT) [ 5 , 6 , 7 , 8 , 9 ].…”

Section: Introductionmentioning

confidence: 99%

The Influence of Thermal Properties Anisotropy on Subtractive Laser Processing of B4C/h-BN Composites

et al. 2020

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This work concerns boron carbide matrix composites with the addition of hexagonal boron nitride particles (h-BN) as a solid lubricate. The composite materials were hot-pressed and analysed in terms of phase, structure, and microstructure changes in relation to the h-BN content. The uniaxial pressure applied during the manufacturing process allowed the orientation of single h-BN particles and its agglomerates in perpendicular direction to the pressing axis. The anisotropy of heat transfer and thermal expansion coefficient (CTE) and density changes in relation to temperature are discussed. Thermal diffusivity and conductivity were measured in relation to the material direction by the laser flash analysis method (LFA). In this paper, understanding the heat flow and CTE changes allowed explaining the results of investigated subtractive laser processes of the manufactured composites. The laser ablation process was conducted on B4C/h-BN composites in parallel and perpendicular direction to each other. It was done in a continuous work (CW) mode at 50 W with a 40 µm spot and 3 mm/s beam travel speed. The influence of h-BN particles and their orientation on thermal properties is discussed. The effect of laser processing on B4C/h-BN composites was also discussed in relation to the material surface roughness measured with a confocal microscope, microstructure observations, density, and thermal properties changes in relation to the material direction.

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Insights into the Solution Processing of Non‐van der Waals Boron Carbide

Sahoo,

Lobo,

Gangaiah

et al. 2024

Chemistry A European J

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Exfoliation of non‐layered materials is crucial to unleash their enormous potential in wide range of applications. However, the presence of strong non‐van der Waals interactions in all three dimensions makes exfoliation challenging. Boron carbide (B4C), known for its high hardness, holds great potential for diverse applications. In this work, B4C is exfoliated in 29 solvents to determine its Hansen solubility parameters (HSP) and understand the dispersion stability. The experimentally determined HSP values are 19.6, 15.3 and 15.1 MPa1/2 for dispersive interactions (δD), polar interactions (δP) and hydrogen bonding interactions (δH), respectively. Subsequently, in situ dispersion stability is analyzed qualitatively and quantitatively from the space‐time resolved extinction profiles employing an analytical centrifuge. The sedimentation kinetics of B4C dispersions are analyzed using instability index, integral extinction and sedimentation velocity. B4C dispersions in solvents like ε‐caprolactone, isopropyl alcohol, propylene carbonate and formamide exhibited excellent stability. Additionally, B4C nanosheets are utilized to investigate their field emission properties. These nanosheets exhibit a turn‐on electric field of 3.35 V/μm at an emission current density of 1 μA cm‐2, and it delivered a large emission current density of ~ 375 μA cm‐2 at an applied electric field of 5.7 V/μm.

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Preparation of boron carbide nanosheets with high neutron-shielding properties based on reduced graphene oxide aerogel

Cited by 11 publications

References 44 publications

Boron Bifunctional Catalysts for Rapid Degradation of Persistent Organic Pollutants in a Metal-Free Electro-Fenton Process: O₂ and H₂O₂ Activation Process

Boron Bifunctional Catalysts for Rapid Degradation of Persistent Organic Pollutants in a Metal-Free Electro-Fenton Process: O₂ and H₂O₂ Activation Process

The Influence of Thermal Properties Anisotropy on Subtractive Laser Processing of B4C/h-BN Composites

Insights into the Solution Processing of Non‐van der Waals Boron Carbide

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Preparation of boron carbide nanosheets with high neutron-shielding properties based on reduced graphene oxide aerogel

Cited by 11 publications

References 44 publications

Boron Bifunctional Catalysts for Rapid Degradation of Persistent Organic Pollutants in a Metal-Free Electro-Fenton Process: O2 and H2O2 Activation Process

Boron Bifunctional Catalysts for Rapid Degradation of Persistent Organic Pollutants in a Metal-Free Electro-Fenton Process: O2 and H2O2 Activation Process

The Influence of Thermal Properties Anisotropy on Subtractive Laser Processing of B4C/h-BN Composites

Insights into the Solution Processing of Non‐van der Waals Boron Carbide

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Boron Bifunctional Catalysts for Rapid Degradation of Persistent Organic Pollutants in a Metal-Free Electro-Fenton Process: O₂ and H₂O₂ Activation Process

Boron Bifunctional Catalysts for Rapid Degradation of Persistent Organic Pollutants in a Metal-Free Electro-Fenton Process: O₂ and H₂O₂ Activation Process