Preparation of sodium and boron co-doped graphitic carbon nitride for the enhanced production of H2O2 via two-electron oxygen reduction and the degradation of 2,4-DCP via photocatalytic oxidation coupled with Fenton oxidation

Chu, Yanyang; Zheng, Xianglei; Fan, Jinruo

doi:10.1016/j.cej.2021.134020

Cited by 62 publications

(18 citation statements)

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“…This slight decrease might be ascribed to the loss of active sites caused by the accumulation of some reaction intermediates from the MeP degradation on the surface of the photocatalyst. 69 These results show that the material is stable and can be recycled after each run. To further examine the stability, XRD, SEM, and EDX (Figure 12b−d) analyses were also performed for the catalyst (rGO/AgNPs) before the first photocatalysis reaction and after six cycles of recycling.…”

Section: ■ Results and Discussionmentioning

confidence: 77%

“…Although the MeP degradation efficiency exhibited a gradual downward tendency, even after six recycles the photocatalyst still possessed over 80% of the activity seen in the first cycle. This slight decrease might be ascribed to the loss of active sites caused by the accumulation of some reaction intermediates from the MeP degradation on the surface of the photocatalyst . These results show that the material is stable and can be recycled after each run.…”

Section: Resultsmentioning

confidence: 83%

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Photocatalytic Degradation of Methylparaben Using Green Nanosilver Supported on Reduced Graphene Oxide

Khan

Jain

Pant

et al. 2023

Ind. Eng. Chem. Res.

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Methylparaben (MeP) is one of the most serious water pollutants found in cosmetic industry effluents. It interferes with various organisms’ endocrine or hormonal systems and has been increasingly accumulating in water bodies because of its widespread use and high chemical stability, prompting the need for its mitigation. Plasmonic nanoparticles offer a promising pathway for pollutant removal in water treatment due to their ability to perform direct visible light-driven photocatalysis. In this regard, a hybrid catalyst of silver nanoparticles on reduced graphene oxide (rGO/AgNPs) was fabricated using biobased in situ reduction process and was employed as a visible light photocatalyst to treat MeP. The use of green reducing agents reduces the overall cost and environmental impact of the process. The synthesized catalyst exhibits significantly enhanced adsorption and photocatalytic degradation efficiency of MeP (97.6%) than rGO or AgNPs, individually. The conditions that influence the kinetics of the photocatalytic degradation by rGO/AgNPs were comprehensively studied using response surface methodology, including solution pH, catalyst dose, persulfate concentration, MeP initial concentration, and time. The nanocomposite showed high stability and could be used for several cycles without reducing the activity. Additionally, the mechanism of the photocatalytic reaction was investigated by scavenger tests and the density functional theory study. This approach provides new insights into the future research and development of low-cost photocatalysts for cosmetic wastewater treatment utilizing visible light irradiation.

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Section: ■ Results and Discussionmentioning

confidence: 77%

Section: Resultsmentioning

confidence: 83%

Photocatalytic Degradation of Methylparaben Using Green Nanosilver Supported on Reduced Graphene Oxide

Khan

Jain

Pant

et al. 2023

Ind. Eng. Chem. Res.

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“…In addition, the characteristic peaks of CN and C–O–H were not observed in the C 1s and N 1s spectra of CN-BK, which might be caused by the low contents of cyano and hydroxyl groups. A characteristic peak (191.79 eV) was exhibited in the B 1s spectra (Figure c), which corresponded to the typical B–N bond . This result suggested that B atoms were introduced into the in-plane structure of CN by replacing the C atoms.…”

Section: Resultsmentioning

confidence: 87%

“…A characteristic peak (191.79 eV) was exhibited in the B 1s spectra (Figure 3c), which corresponded to the typical B− N bond. 29 This result suggested that B atoms were introduced into the in-plane structure of CN by replacing the C atoms. The intensity of the peak at 191.79 eV decreased slightly compared with that of CN-B, which might be attributed to slight destruction of the tri-s-triazine structure of CN by the alkalization of KI.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Potassium-Derived Charge Channels in Boron-Doped g-C₃N₄ Nanosheets for Photocatalytic NO Oxidation and Hydrogen Evolution

et al. 2023

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The application of graphitic carbon nitride (g-C3N4) in photocatalytic NO oxidation was limited due to severe recombination of photogenerated carriers and low concentration of oxidizing species. In this work, K and B were introduced into the interlayer and in-plane framework of g-C3N4 to address this challenge through the thermal polymerization process. The synthesized K-doped B-g-C3N4 nanosheets exhibited expanded light absorption and low charge recombination efficiency. In addition, the doping of K and B reduced the band gap of g-C3N4, which corresponded to enhanced light absorption. B was introduced into the in-plane structure by replacing C atoms, which adjusted the in-plane electron distribution. K was inserted into the interlayer by binding to the N and C atoms of adjacent layers. K-derived electron transfer channels were constructed, which increased electron delocalization and expanded the π-conjugate system. More electrons were transferred through the interlayer channels and were involved in the reaction process. The severe carrier recombination and weak transfer were improved due to the synergistic effect of K and B doping. K-doped B-g-C3N4 nanosheets exhibited enhanced generation of superoxide radicals and hydroxyl radicals, which played a key role during NO oxidation. The photocatalytic NO oxidation efficiency of codoped g-C3N4 nanosheets reached 61%, which was 2.1 and 1.2 times of that of pristine g-C3N4 and B-doped g-C3N4, respectively. The codoped g-C3N4 sample still exhibited stable photocatalytic NO oxidation efficiency after five cycles. This result provided a potential idea for improving the charge distribution and transfer of layered materials by codoping metallic and nonmetallic elements and for photocatalytic NO oxidation.

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“…DFT results showed that NH x and N 2 C Elemental doping modified g-C 3 N 4 can improve the separation of photogenerated electron-hole and the mobility of charge carriers, and extend the visible light absorption properties. [94][95][96] To systematically study the effect of heteroatom doping on the structural and electronic properties of g-C 3 N 4 , Choi's group prepared S and K codoped C 3 N 4 (AKMT) for efficient production of H 2 O 2 up to 1.37 mm h −1 under λ > 420 nm and 100% AQY at 450 nm. [95] DFT calculations and spectroscopic studies showed that local charge polarization improved the adsorption of O 2 , while the synergistic effect of K and S enabled the trapped longlived electron to promote the kinetics of H 2 O 2 production.…”

Section: Photocatalysts Of 2e − Orr Processmentioning

confidence: 99%

Versatile Photoelectrocatalysis Strategy Raising Up the Green Production of Hydrogen Peroxide

Zhou

Tan

et al. 2023

Advanced Energy Materials

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H2O2 plays an irreplaceable role in many aspects of human society, such as paper bleaching, medical disinfection, wastewater treatment, organic synthesis, hydrometallurgy and the electronic industry. However, the unsustainability of the current industrial production process of traditional anthraquinone has a serious conflict with the green sustainable development. The photo/electrocatalytic H2O2 production from renewable energy has the advantages of being more economical, low‐carbon and green, and in line with the requirements of energy economy. These catalytic methods of green H2O2 production have played a demonstrative role in the development of many small molecules, contributing to a fundamental understanding of general catalysis and providing a scientific perspective for future new energy cycles. In this review, the authors aim to integrate the reaction process and mechanism of photocatalytic and electrocatalytic H2O2 production, summarize the development and application of photocatalytic and electrocatalytic H2O2 production in recent years, and assess the modern technologies promoted in the process of H2O2 production research, including the development of flux production equipment and reaction coproduction, etc. This review intends to provide a clear logic profile and new directions for the development of H2O2 production, and calls for more researchers to provide more insights into the development of this field.

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Preparation of sodium and boron co-doped graphitic carbon nitride for the enhanced production of H2O2 via two-electron oxygen reduction and the degradation of 2,4-DCP via photocatalytic oxidation coupled with Fenton oxidation

Cited by 62 publications

References 50 publications

Photocatalytic Degradation of Methylparaben Using Green Nanosilver Supported on Reduced Graphene Oxide

Photocatalytic Degradation of Methylparaben Using Green Nanosilver Supported on Reduced Graphene Oxide

Potassium-Derived Charge Channels in Boron-Doped g-C₃N₄ Nanosheets for Photocatalytic NO Oxidation and Hydrogen Evolution

Versatile Photoelectrocatalysis Strategy Raising Up the Green Production of Hydrogen Peroxide

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Preparation of sodium and boron co-doped graphitic carbon nitride for the enhanced production of H2O2 via two-electron oxygen reduction and the degradation of 2,4-DCP via photocatalytic oxidation coupled with Fenton oxidation

Cited by 62 publications

References 50 publications

Photocatalytic Degradation of Methylparaben Using Green Nanosilver Supported on Reduced Graphene Oxide

Photocatalytic Degradation of Methylparaben Using Green Nanosilver Supported on Reduced Graphene Oxide

Potassium-Derived Charge Channels in Boron-Doped g-C3N4 Nanosheets for Photocatalytic NO Oxidation and Hydrogen Evolution

Versatile Photoelectrocatalysis Strategy Raising Up the Green Production of Hydrogen Peroxide

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Product

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Potassium-Derived Charge Channels in Boron-Doped g-C₃N₄ Nanosheets for Photocatalytic NO Oxidation and Hydrogen Evolution