Fabrication of nitrogen-deficient g-C3N4 nanosheets via an acetaldehyde-assisted hydrothermal route and their high photocatalytic performance for H2O2 production and Cr(<scp>vi</scp>) reduction

Wang, Longtao; Li, Feng; He, Qingyun; Liu, Xingqiang; Yu, Changlin

doi:10.1039/d3nj01963b

Cited by 11 publications

(3 citation statements)

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“…By comparing the above two schemes of the photocatalytic reduction of Cr( vi ), the former is obviously superior to the latter. In addition, the photocatalytic reduction of Cr( vi ) has been compared with the previous reports, 63,64 as shown in Table S4 †. Interestingly, compounds 1–4 have good characteristics as catalysts for the photocatalytic reduction of Cr( vi ).…”

Section: Resultsmentioning

confidence: 91%

Four octamolybdate compounds with properties of organic dye adsorption and photocatalytic reduction of Cr(vi)

Hao,

Ying,

Zhang

et al. 2023

Dalton Trans.

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Section: Resultsmentioning

confidence: 91%

Four octamolybdate compounds with properties of organic dye adsorption and photocatalytic reduction of Cr(vi)

Hao,

Ying,

Zhang

et al. 2023

Dalton Trans.

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“…After the introduction of N/O vacancies, the absorption edge broadens to 410 and 506 nm, respectively, consistent with previous reports. 58,59 Upon the formation of heterojunctions, the absorption edges of CNS/BOCB and CNS/BOCB-OV are respectively located between their two components.…”

Section: Resultsmentioning

confidence: 99%

Synergistic mediation of dual donor levels in CNS/BOCB-OV heterojunctions for enhanced photocatalytic CO₂ reduction

Fang,

Yang,

Sun

et al. 2024

J. Mater. Chem. A

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“…Moreover, the ultrasonication step in acid media, performed in the synthesis of 500-AUCN, resulted in a reduction in the number of N 2C atoms relative to N 3C atoms when compared to 500-UCN and 500-CN, leading to the creation of N vacancies that enhance its photocatalytic performance [ 64 , 118 ]. It has been reported that a higher concentration of nitrogen vacancies improves the separation of photogenerated charge carriers and light absorption [ 119 , 120 ]. Furthermore, N 3C has a larger number of unpaired electrons in the nitrogen atoms, resulting in a higher density of active sites available for photocatalytic processes [ 121 ].…”

Section: Resultsmentioning

confidence: 99%

Exploring the Remarkably High Photocatalytic Efficiency of Ultra-Thin Porous Graphitic Carbon Nitride Nanosheets

Kalantari Bolaghi,

Rodriguez-Seco,

Yurtsever

et al. 2024

Nanomaterials

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Graphitic carbon nitride (g-C3N4) is a metal-free photocatalyst used for visible-driven hydrogen production, CO2 reduction, and organic pollutant degradation. In addition to the most attractive feature of visible photoactivity, its other benefits include thermal and photochemical stability, cost-effectiveness, and simple and easy-scale-up synthesis. However, its performance is still limited due to its low absorption at longer wavelengths in the visible range, and high charge recombination. In addition, the exfoliated nanosheets easily aggregate, causing the reduction in specific surface area, and thus its photoactivity. Herein, we propose the use of ultra-thin porous g-C3N4 nanosheets to overcome these limitations and improve its photocatalytic performance. Through the optimization of a novel multi-step synthetic protocol, based on an initial thermal treatment, the use of nitric acid (HNO3), and an ultrasonication step, we were able to obtain very thin and well-tuned material that yielded exceptional photodegradation performance of methyl orange (MO) under visible light irradiation, without the need for any co-catalyst. About 96% of MO was degraded in as short as 30 min, achieving a normalized apparent reaction rate constant (k) of 1.1 × 10−2 min−1mg−1. This represents the highest k value ever reported using C3N4-based photocatalysts for MO degradation, based on our thorough literature search. Ultrasonication in acid not only prevents agglomeration of g-C3N4 nanosheets but also tunes pore size distribution and plays a key role in this achievement. We also studied their performance in a photocatalytic hydrogen evolution reaction (HER), achieving a production of 1842 µmol h−1 g−1. Through a profound analysis of all the samples’ structure, morphology, and optical properties, we provide physical insight into the improved performance of our optimized porous g-C3N4 sample for both photocatalytic reactions. This research may serve as a guide for improving the photocatalytic activity of porous two-dimensional (2D) semiconductors under visible light irradiation.

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Fabrication of nitrogen-deficient g-C₃N₄ nanosheets via an acetaldehyde-assisted hydrothermal route and their high photocatalytic performance for H₂O₂ production and Cr(vi) reduction

Abstract: A highly nitrogen-deficient g-C3N4 (AH-CN) nanosheets material was successfully prepared by acetaldehyde assisted hydrothermal route. The as-prepared AH-CN material was analyzed by a series of X-ray powder diffraction (XRD), N2...

Cited by 11 publications

References 72 publications

Four octamolybdate compounds with properties of organic dye adsorption and photocatalytic reduction of Cr(vi)

Four octamolybdate compounds with properties of organic dye adsorption and photocatalytic reduction of Cr(vi)

Synergistic mediation of dual donor levels in CNS/BOCB-OV heterojunctions for enhanced photocatalytic CO₂ reduction

Exploring the Remarkably High Photocatalytic Efficiency of Ultra-Thin Porous Graphitic Carbon Nitride Nanosheets

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Fabrication of nitrogen-deficient g-C3N4 nanosheets via an acetaldehyde-assisted hydrothermal route and their high photocatalytic performance for H2O2 production and Cr(vi) reduction

Abstract: A highly nitrogen-deficient g-C3N4 (AH-CN) nanosheets material was successfully prepared by acetaldehyde assisted hydrothermal route. The as-prepared AH-CN material was analyzed by a series of X-ray powder diffraction (XRD), N2...

Cited by 11 publications

References 72 publications

Four octamolybdate compounds with properties of organic dye adsorption and photocatalytic reduction of Cr(vi)

Four octamolybdate compounds with properties of organic dye adsorption and photocatalytic reduction of Cr(vi)

Synergistic mediation of dual donor levels in CNS/BOCB-OV heterojunctions for enhanced photocatalytic CO2 reduction

Exploring the Remarkably High Photocatalytic Efficiency of Ultra-Thin Porous Graphitic Carbon Nitride Nanosheets

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Fabrication of nitrogen-deficient g-C₃N₄ nanosheets via an acetaldehyde-assisted hydrothermal route and their high photocatalytic performance for H₂O₂ production and Cr(vi) reduction

Synergistic mediation of dual donor levels in CNS/BOCB-OV heterojunctions for enhanced photocatalytic CO₂ reduction