Ag nanoparticles decorated WO3/g-C3N4 2D/2D heterostructure with enhanced photocatalytic activity for organic pollutants degradation

Chen, Jiayi; Xiao, Xinyan; Wang, Yi; Ye, Zhihao

doi:10.1016/j.apsusc.2018.10.236

Cited by 59 publications

(42 citation statements)

References 55 publications

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“…As shown in Figure 6b, the corresponding band gaps of g-C 3 N 4 and WO 3 are estimated to be 2.62 and 3.17 eV. The band gap of WO 3 in this work is larger than that from previous reports, 10,12,29−31 which may be caused by the ultrathin diameter of nanorods. After the introduction of oxygen vacancies, the band gap of WO 3– x nanorods remains as 3.17 eV.…”

Section: Resultsmentioning

confidence: 47%

Enhanced Photocatalytic CO₂ Reduction in Defect-Engineered Z-Scheme WO_3–x/g-C₃N₄ Heterostructures

et al. 2019

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Oxygen vacancy-modified WO3–x nanorods composited with g-C3N4 have been synthesized via the chemisorption method. The crystalline structure, morphology, composition, band structure, and charge separation mechanism for WO3–x/g-C3N4 heterostructures are studied in detail. The g-C3N4 nanosheets are attached on the surface of WO3–x nanorods. The Z-scheme separation is confirmed by the analysis of generated hydroxyl radicals. The electrons in the lowest unoccupied molecular orbital of g-C3N4 and the holes in the valence band of WO3 can participate in the photocatalytic reaction to reduce CO2 into CO. New energy levels of oxygen vacancies are formed in the band gap of WO3, further extending the visible-light response, separating the charge carriers in Z-scheme and prolonging the lifetime of electrons. Therefore, the WO3–x/g-C3N4 heterostructures exhibit much higher photocatalytic activity than the pristine g-C3N4.

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Section: Resultsmentioning

confidence: 47%

Enhanced Photocatalytic CO₂ Reduction in Defect-Engineered Z-Scheme WO_3–x/g-C₃N₄ Heterostructures

et al. 2019

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“…Nevertheless, the bare g-C 3 N 4 presents high recombination rate of the photoinduced carriers (electron-hole pairs), which affects the photocatalytic activity. To enhance the separation of photogenerated charges and improve the efficiency of the photocatalytic process, heterojunction composites or multilayered structures have been introduced, including doping and coupling g-C 3 N 4 with metal, nonmetal and other semiconductor materials, such as Ag/g-C 3 N 4 [7], CdS/g-C 3 N 4 [8], ZnO/g-C 3 N 4 [9], AuPd/g-C 3 N 4 [10], and WO 3 /g-C 3 N 4 [11]. In the last case, the composite heterostructure presents a much higher photocatalytic activity than the pristine g-C 3 N 4 and WO 3 components [12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Bifunctional g-C3N4/WO3 Thin Films for Photocatalytic Water Purification

Αντωνιάδου

Arfanis

Ibrahim

et al. 2019

Water

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A bifunctional thin film photocatalyst consisting of graphitic carbon nitride on tungsten trioxide (g-C3N4/WO3) is introduced for the improvement of photocatalytic activity concerning hexavalent chromium reduction and methylene blue dye removal in water, compared to the bare, widely used WO3 semiconductor. A bilayered structure was formed, which is important for the enhancement of the charge carriers’ separation. The characterization of morphological, structural, optoelectronic, and vibrational properties of the photocatalysts permitted a better understanding of their photocatalytic activity for both dye degradation and Cr+6 elimination in water and the analysis of the photocatalytic kinetics permitted the determination of the corresponding pseudo-first-order reaction constants (k). Trapping experiments performed under UV illumination revealed that the main active species for the photocatalytic reduction of Cr+6 ions are electrons, whereas in the case of methylene blue azo-dye (MB) oxidation, the activation of the corresponding photocatalytic degradation comes via both holes and superoxide radicals.

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“…The photodegradation pathways of RhB were studied in the previous research. 41 According to the research results (Supporting Information, Fig. S1), a series of N-deethylated intermediates (R1-R4) were firstly produced by N-deethylated reactions on RhB.…”

Section: Characterization Of Samplesmentioning

confidence: 96%

PVP‐assisted synthesis of P‐Bi₄O₅Br₂/AgI heterojunction with enhanced photocatalytic activity for degradation of rhodamine B

Luo

Xiao

Wang

et al. 2021

J of Chemical Tech & Biotech

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BACKGROUND: The commonly used RhB dye is a carcinogen that is widely found in environmental matrices and poses a threat to aquatic biota and human health. However, conventional wastewater treatment processes do not effectively remove low concentrations of these pollutants. Herein, the P-Bi 4 O 5 Br 2 /AgI (PBA) heterojunction was synthesized via a polyvinylpyrrolidone (PVP)-assisted solvothermal and precipitation method in this work. RESULTS:The photocatalytic efficiency of the PBA heterojunction was evaluated by degrading rhodamine B (RhB) with the irradiation of simulated sunlight. P-Bi 4 O 5 Br 2 /AgI-50 (PBA-50, the mass fraction of AgI in the composite was 50%) composite could degrade 98% RhB under 90 min irradiation of 500 W Xenon lamp, and its pseudo first-order reaction rate constant was 0.04265 min −1 , which was 17.1, 2.16, and 2.94 times higher than that of Bi 4 O 5 Br 2 , P-Bi 4 O 5 Br 2 , and AgI, respectively. Besides, the effects of the dosage of photocatalyst and the anion on the photocatalytic degradation of RhB over PBA-50 were analyzed. CONCLUSION:The enhanced photocatalytic activity of PBA was attributed to its better visible light capture ability, larger specific surface area, and faster photogenerated carrier separation efficiency, all of which were confirmed by scanning electron microscopy (SEM), Brunauer-Emmett-Teller (BET), UV-Vis diffues reflectance spectroscopy (DRS), X-ray photoelectron spectroscopy (XPS), and photoelectrochemical analysis. In addition, the free radical trapping experiments confirmed that •O 2 − and h + were the main active species for degradation of RhB. Additionally, the smaller bandgap and the more negative conduction band position of Bi 4 O 5 Br 2 were reached after the introduction of PVP. Accordingly, a possible type-II heterojunction photocatalytic mechanism of P-Bi 4 O 5 Br 2 /AgI was proposed.

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Ag nanoparticles decorated WO3/g-C3N4 2D/2D heterostructure with enhanced photocatalytic activity for organic pollutants degradation

Cited by 59 publications

References 55 publications

Enhanced Photocatalytic CO₂ Reduction in Defect-Engineered Z-Scheme WO_3–x/g-C₃N₄ Heterostructures

Enhanced Photocatalytic CO₂ Reduction in Defect-Engineered Z-Scheme WO_3–x/g-C₃N₄ Heterostructures

Bifunctional g-C3N4/WO3 Thin Films for Photocatalytic Water Purification

PVP‐assisted synthesis of P‐Bi₄O₅Br₂/AgI heterojunction with enhanced photocatalytic activity for degradation of rhodamine B

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Ag nanoparticles decorated WO3/g-C3N4 2D/2D heterostructure with enhanced photocatalytic activity for organic pollutants degradation

Cited by 59 publications

References 55 publications

Enhanced Photocatalytic CO2 Reduction in Defect-Engineered Z-Scheme WO3–x/g-C3N4 Heterostructures

Enhanced Photocatalytic CO2 Reduction in Defect-Engineered Z-Scheme WO3–x/g-C3N4 Heterostructures

Bifunctional g-C3N4/WO3 Thin Films for Photocatalytic Water Purification

PVP‐assisted synthesis of P‐Bi4O5Br2/AgI heterojunction with enhanced photocatalytic activity for degradation of rhodamine B

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Enhanced Photocatalytic CO₂ Reduction in Defect-Engineered Z-Scheme WO_3–x/g-C₃N₄ Heterostructures

Enhanced Photocatalytic CO₂ Reduction in Defect-Engineered Z-Scheme WO_3–x/g-C₃N₄ Heterostructures

PVP‐assisted synthesis of P‐Bi₄O₅Br₂/AgI heterojunction with enhanced photocatalytic activity for degradation of rhodamine B