Bandgap control of p-n heterojunction of Cu–Cu2O @ ZnO with modified reduced graphene oxide nanocomposites for photocatalytic hydrogen evolution

Thanh, Vuong Hoai; Mahvelati-Shamsabadi, Tahereh; Dang, Thanh Truong; Dao, Duc Quang; Shin, Eun Woo; Chung, Jin Suk

doi:10.1016/j.ijhydene.2022.05.139

Cited by 17 publications

(9 citation statements)

References 80 publications

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“…Specifically, PL results could be a powerful tool for determining the charge recombination rate in photocatalysts in which a higher intensity would indicate higher electron–hole pair recombination. 53 Fig. 6a shows that GCN presents the fastest charge recombination compared to the modified samples.…”

Section: Resultsmentioning

confidence: 97%

Revisiting the roles of dopants in g-C₃N₄nanostructures for piezo-photocatalytic production of H₂O₂: a case study of selenium and sulfur

et al. 2023

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Section: Resultsmentioning

confidence: 97%

Revisiting the roles of dopants in g-C₃N₄nanostructures for piezo-photocatalytic production of H₂O₂: a case study of selenium and sulfur

et al. 2023

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“…Thus, solar‐to‐chemical strategies open new opportunities for researchers to store energy in chemical bonding states and purify surrounding environments from toxic agents. [ 4 ] Figure 1 illustrates the evolution of photocatalytic studies throughout history with some demonstrations from the earliest stage. In 1911, photocatalysis was termed and used in scientific communications when the work on bleaching Prussian blue by illuminating ZnO was recorded in Germany.…”

Section: Introductionmentioning

confidence: 99%

Nitrogen‐rich graphitic carbon nitride (g‐C₃N₅): Emerging low‐bandgap materials for photocatalysis

Thanh

Nguyen

Phuong

et al. 2023

Carbon Neutralization

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The bottlenecks in photocatalytic materials primarily center on light absorption capacities and rapid charge recombination. Thus, many gigantic effects have been undertaken by worldwide scientists to address the issues. In this concept, carbon‐based photocatalysts, such as graphene or graphitic carbon nitrides (g‐C3N4), would frequently capture scientific fascination due to their distinct properties in catalytic applications. However, traditional materials would possess the drawbacks mentioned above. In the current era, nitrogen‐rich graphitic carbon nitrides (g‐C3N5) have emerged as a promising star for photocatalytic applications due to the significant enhancements in light absorption properties, which can activate in ultraviolet, visible, and even under near‐infrared irradiations. This review will summarize the recent progress in the fabrication of g‐C3N5 and the photocatalytic application of these based materials by thoroughly investigating current literature studies. Thus, updating the current trend in state‐of‐the‐art materials would motivate researchers to explore the field further.

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“…From the FTIR spectrum of ZnO, the major peaks of ZnO have been observed at 430, 880, 1637, and 3430 cm −1 . The peak at 442 cm −1 corresponds to Zn–O symmetric stretching vibration 63 and the peak at 809 cm −1 is due to bending vibration of Zn–O in agreement with 42 , 63 – 65 . The peaks at 1635 cm −1 and 3422 cm −1 are due to O–H bending and stretching vibration mode respectively of the water molecule and surface hydroxyl groups.…”

Section: Resultsmentioning

confidence: 65%

“…All the diffraction peaks can be assigned to the pure covellite hexagonal phase (JCPDS 06-0464). It can be observed that CuS QDs have well-defined characteristic diffraction peaks with 2θ values of (27.7°, 29.3°, 31.76°, 32.7°, 47.8°, 52.3°, 59.2°) which are corresponding respectively to (100), (101), (103), (006), (107), (108), and (116) crystal planes of the preferential orientation of CuS NPs 41 , 42 . CuS QDs have relatively high crystallinity and the most intense peak at 2θ = 31.76 relates to (103) diffraction plane.…”

Section: Resultsmentioning

confidence: 99%

Copper sulfide and zinc oxide hybrid nanocomposite for wastewater decontamination of pharmaceuticals and pesticides

Mohammed

Ali

Gomaa

et al. 2022

Sci Rep

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In this work, hybrid nanocomposites of CuS QDs @ ZnO photocatalysts are fabricated through a facile microwave-assisted (MW) hydrothermal method as a green preparation process. The prepared photocatalysts (PCs) are employed under simulated sunlight (SL) for the degradation of ciprofloxacin, ceftriaxone, ibuprofen pharmaceuticals, methylene blue dye, and 2,4,5-trichlorophenoxyacetic acid (2,4-D) pesticide. The prepared photocatalysts are characterized in detail using several compositional, optical, and morphological techniques. The influence of the CuS (QDs) wt. % on morphological, structural, as well as photocatalytic degradation efficiency have been investigated. The small displacement between the (107) plane of CuS and the (102) plane of ZnO can confirmed the existence of lattice interaction, implying the formation of p-n heterojunctions. TEM and XRD results demonstrated that the CuS QDs are established and uniformly decorated on the surface of ZnO NRs, confirming the forming of an efficient CuS QDs @ ZnO heterojunction nanostructures. The CuS QDs @ ZnO hybrid nanocomposites showed enhancement in crystallinity, light absorption, surface area, separation of e–h pair and inhibition in their recombination at an interfacial heterojunction. In addition it is found that, 3 wt% CuS QDs @ ZnO has the foremost influence. The results showed improvement of photocatalytic activity of the 3% CuS QDs @ ZnO hybrid nanocomposite as compared to the bare ZnO nanorods. The impressive photocatalytic performance of CuS @ ZnO heterostructure nanorods may be attributed to efficient charge transfer. The prepared CuS QDs @ ZnO hybrid nanocomposites exhibited 100% removal for MB dye, after 45 min, and after 60 min for ibuprofen, ciprofloxacin pharmaceuticals, and 2.4.5 trichloro phenoxy acetic acid pesticide with the catalyst amount of 0.2 g/L. Although 100% removal of ceftriaxone pharmaceutical acheived after 90 min. In addition CuS QDs @ ZnO hybrid nanocomposites exhibited complete removal of COD for ibuprofen, ceftriaxone pharmaceuticals and 2.4.5 trichloro phenoxy acetic acid pesticide after 2 h with no selectivity. Briefly, 3% CuS QDs@ZnO hybrid nanocomposites can be considered as promising photoactive materials under simulated sunlight for wastewater decontamination.

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Bandgap control of p-n heterojunction of Cu–Cu2O @ ZnO with modified reduced graphene oxide nanocomposites for photocatalytic hydrogen evolution

Cited by 17 publications

References 80 publications

Revisiting the roles of dopants in g-C₃N₄nanostructures for piezo-photocatalytic production of H₂O₂: a case study of selenium and sulfur

Revisiting the roles of dopants in g-C₃N₄nanostructures for piezo-photocatalytic production of H₂O₂: a case study of selenium and sulfur

Nitrogen‐rich graphitic carbon nitride (g‐C₃N₅): Emerging low‐bandgap materials for photocatalysis

Copper sulfide and zinc oxide hybrid nanocomposite for wastewater decontamination of pharmaceuticals and pesticides

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Bandgap control of p-n heterojunction of Cu–Cu2O @ ZnO with modified reduced graphene oxide nanocomposites for photocatalytic hydrogen evolution

Cited by 17 publications

References 80 publications

Revisiting the roles of dopants in g-C3N4nanostructures for piezo-photocatalytic production of H2O2: a case study of selenium and sulfur

Revisiting the roles of dopants in g-C3N4nanostructures for piezo-photocatalytic production of H2O2: a case study of selenium and sulfur

Nitrogen‐rich graphitic carbon nitride (g‐C3N5): Emerging low‐bandgap materials for photocatalysis

Copper sulfide and zinc oxide hybrid nanocomposite for wastewater decontamination of pharmaceuticals and pesticides

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Product

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Revisiting the roles of dopants in g-C₃N₄nanostructures for piezo-photocatalytic production of H₂O₂: a case study of selenium and sulfur

Revisiting the roles of dopants in g-C₃N₄nanostructures for piezo-photocatalytic production of H₂O₂: a case study of selenium and sulfur

Nitrogen‐rich graphitic carbon nitride (g‐C₃N₅): Emerging low‐bandgap materials for photocatalysis