CO oxidation over Cu2O deposited on 2D continuous lamellar g-C3N4

Shi, Yukun; Hu, Xiaoqing; Jing-tao, Zhao; Zhou, Xiaojiao; Zhu, Baolin; Zhang, Shoumin; Huang, Wei‐Ping

doi:10.1039/c5nj00621j

Cited by 38 publications

(33 citation statements)

References 41 publications

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“…The corresponding binding energies of N 1 s spectra are determined to be 398.8 eV, 400.0 eV, and 401.3 eV (Figure c), corresponding to the structure of g‐C 3 N 4 , further indicating the presence of g‐C 3 N 4. Figure d shows the characteristic peaks of the Cu 2p at 932.7 and 952.7 eV, which are attributed to the binding energy of Cu 2p 3/2 and Cu 2p 1/2 , respectively. However, it is difficult to differentiate Cu 2 O and Cu by the XPS feature of Cu 2p 3/2 and Cu 2p 1/2 because their binding energies are very close.…”

Section: Resultsmentioning

confidence: 99%

“…Owing to the presence of both robust h + and •O 2 − radicals, g‐C 3 N 4 ‐Cu 2 O is hence enabled with a powerful photooxidation ability . When dispersed g‐C 3 N 4 is evenly in contact with the surface of Cu 2 O, electrons will diffuse from g‐C 3 N 4 to Cu 2 O, thus resulting in an internal electric field formed until the Fermi levels of g‐C 3 N 4 and Cu 2 O reached equilibration, which constitutes the heterojunction . Once the heterojunction was irradiated with visible light, both g‐C 3 N 4 and Cu 2 O can be excited and produce photogenerated electron–hole pairs.…”

Section: Resultsmentioning

confidence: 99%

“…Constructing a heterojunction is an effective strategy to enhance carrier transfer between semiconductors . The g‐C 3 N 4 ‐Cu 2 O heterojunction is a prospective material for the degradation of organic pollutants because of its high oxidation capacity, low toxicity, and chemical stability . However, the photocatalytic efficiency needs to be further improved due to g‐C 3 N 4 block agglomeration, poor dispersion, and rapid recombination of the light‐generated electron–hole pair.…”

Section: Introductionmentioning

confidence: 99%

“…However, the photocatalytic efficiency needs to be further improved due to g‐C 3 N 4 block agglomeration, poor dispersion, and rapid recombination of the light‐generated electron–hole pair. g‐C 3 N 4 with a core‐shell structure was used to improve the combination of the g‐C 3 N 4 ‐Cu 2 O, but the heterojunction effect needs further improvement …”

Section: Introductionmentioning

confidence: 99%

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Acid‐treated g‐C₃N₄‐Cu₂O composite catalyst with enhanced photocatalytic activity under visible‐light irradiation

Zuo

Xu²,

Liao

et al. 2018

Applied Organom Chemis

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Acid‐treated g‐C3N4‐Cu2O was prepared by hydrothermal reduction followed by high temperature calcination and acid exfoliation. The structures and properties of as‐synthesized samples were characterized using a range of techniques, such as X‐ray photoelectron spectroscopy, scanning electron microscopy, Photoluminescence Spectroscopy and the Brunauer–Emmett–Teller (BET) theory. The photocatalytic activity was evaluated by measuring the photodegradation of methyl orange under visible‐light irradiation. Based on the results of TEM, XPS, EPR and other techniques, it was verified that a heterojunction was formed. The acid treatment process can increase the specific surface area to form abundant heterojunction interfaces as channels for photo‐generated carrier separation, thereby enhancing its light utilization and quantum efficiency. Results indicate that acid‐treated g‐C3N4‐Cu2O possesses a large specific surface area, which provides plentiful activated sites for heterojunctions to form; in addition, it showed a high visible light effect and the minimum charge‐transfer resistance. Furthermore, the g‐C3N4‐Cu2O material exhibits high levels of effectiveness and stability. Electron paramagnetic resonance and a series of radical trapping experiments demonstrate that the holes and •O2− could be the main active species in methyl orange photodegradation. This work could provide new insights into the fabrication of composite materials as high‐performance photocatalysts, and facilitate their application in addressing environmental protection issues.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Acid‐treated g‐C₃N₄‐Cu₂O composite catalyst with enhanced photocatalytic activity under visible‐light irradiation

Zuo

Xu²,

Liao

et al. 2018

Applied Organom Chemis

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“…In the case of the Cu 2 O/g-C 3 N 4 composite structure containing metal oxide as a major component, essentially, no crystalline graphitic carbon nitride signature peaks are seen in the XRD patterns [15]. In the previous studies, hybrid structures of Cu 2 O with g-C 3 N 4 were prepared mainly via a chemical reduction process of Cu(II) precursor [11][12][13]20,29]. Furthermore, various ternary composites have been investigated to gain enhanced stability of the catalyst material, Cu 2 O/g-C 3 N 4 , and separation of photoexcited electron-hole pairs [17,30].…”

Section: Results and Discussion Physicochemical Propertiesmentioning

confidence: 99%

Solid-state Synthesis of Composite Structures of Various Cu(I)-based Oxides with g-C3 N4 for Harvesting Solar Energy

2018

AMSE

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Development of novel materials for an efficient harvesting of solar energy towards applications in environment and energy sectors is an important area of research. A metal-free polymeric material, g-C3 N4 is modified with three Cu(I)- based oxides namely Cu2 O, CuVO3 , and Cu3 VO4 to extend the absorption of the solar spectrum. The composite structures are synthesized by a facile one-step solid-state reaction under inter atmosphere and atmospheric pressure. The amounts of loadings of Cu(I)-based oxides onto g-C3 N4 is varied from 2 wt.% to 10 wt.%. Powder XRD patterns showed that the graphitic structure of carbon nitride is maintained upon the construction of hybrid structures with Cu(I) oxides. SEM images show the textural transformation of the bulk structure of g-C3 N4 into nanosheets upon thermal retreatment. FT-IR spectra further confirmed the stability of g-C3 N4 observed in the XRD patterns. In comparison with the pristine g-C3 N4 , the DR-UV-Vis spectra of the modified solid powders demonstrated a clear red shift in the absorption towards higher wavelength and their better prospects in harvesting solar energy. Tauc plots derived from the DR-UV-Vis spectra showed a narrowing of the direct-allowed band gap upon modifications with Cu(I)-based oxides. The composites showed moderate activity in photocatalytic degradation of rhodamine B under irradiation from a solar simulator

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Carbon Monoxide Desorption and Reduction Studies of Graphitic Carbon Nitride Supported Nickel Catalysts for CO Methanation

et al. 2022

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Graphitic carbon nitride (g-C 3 N 4 ) has attracted much attention due to its unique polymeric structure of carbon and nitrogen in the form of heptazine units. In this study, a nickel catalyst supported on graphitic carbon nitride was prepared by a facile impregnation method. Ni/g-C 3 N 4 desorption and reduction behaviors with carbon monoxide (CO) were investigated by temperature-programmed desorption (TPD) and reduction (TPR). The chemisorption study of reduction and desorption behaviors of CO molecules on Ni/g-C 3 N 4 catalyst is essential for CO methanation reaction. The as-prepared Ni/g-C 3 N 4 catalyst was also characterized by X-ray diffraction (XRD), N 2 physisorption, and X-ray photoelectron spectroscopy (XPS). It was found that the utilization of g-C 3 N 4 as a catalyst support enhances the complete reduction of Ni species and CO desorption. This can be attributed to the role of g-C 3 N 4 support as a reducing agent for Ni, as well as its basicity owing to the richness of nitrogen functional group. The good performance of Ni/g-C 3 N 4 catalyst towards CO methanation can be ascribed to the improvement in adsorption and activation of CO molecules on the active sites and the number of surface basic sites.

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CO oxidation over Cu₂O deposited on 2D continuous lamellar g-C₃N₄

Abstract: The changing trend of adsorption ability and the catalytic activity of Cu2O/g-C3N4 moved in the same direction.

Cited by 38 publications

References 41 publications

Acid‐treated g‐C₃N₄‐Cu₂O composite catalyst with enhanced photocatalytic activity under visible‐light irradiation

Acid‐treated g‐C₃N₄‐Cu₂O composite catalyst with enhanced photocatalytic activity under visible‐light irradiation

Solid-state Synthesis of Composite Structures of Various Cu(I)-based Oxides with g-C3 N4 for Harvesting Solar Energy

Carbon Monoxide Desorption and Reduction Studies of Graphitic Carbon Nitride Supported Nickel Catalysts for CO Methanation

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CO oxidation over Cu2O deposited on 2D continuous lamellar g-C3N4

Abstract: The changing trend of adsorption ability and the catalytic activity of Cu2O/g-C3N4 moved in the same direction.

Cited by 38 publications

References 41 publications

Acid‐treated g‐C3N4‐Cu2O composite catalyst with enhanced photocatalytic activity under visible‐light irradiation

Acid‐treated g‐C3N4‐Cu2O composite catalyst with enhanced photocatalytic activity under visible‐light irradiation

Solid-state Synthesis of Composite Structures of Various Cu(I)-based Oxides with g-C3 N4 for Harvesting Solar Energy

Carbon Monoxide Desorption and Reduction Studies of Graphitic Carbon Nitride Supported Nickel Catalysts for CO Methanation

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Product

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CO oxidation over Cu₂O deposited on 2D continuous lamellar g-C₃N₄

Acid‐treated g‐C₃N₄‐Cu₂O composite catalyst with enhanced photocatalytic activity under visible‐light irradiation

Acid‐treated g‐C₃N₄‐Cu₂O composite catalyst with enhanced photocatalytic activity under visible‐light irradiation