Fabrication of hierarchical sheet-on-sheet WO3/g-C3N4 composites with enhanced photocatalytic activity

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

doi:10.1016/j.jallcom.2018.10.404

Cited by 58 publications

(22 citation statements)

References 49 publications

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“…To investigate the effect of WO 3 weight ratio on the photocatalytic performance of WO 3 /g-C 3 N 4 composites, HMB was taken as an example to prepare WO 3 /g-C 3 N 4 composites with different weight ratios of WO 3 (HMB1G3, HMB1G1 and HMB3G1). As shown in figure 2, major diffraction peaks at 13.9°and 27.2°can be observed in the XRD pattern of pure g-C 3 N 4 , corresponding to the (100) and (002) plane of the characteristic interplanar stacking structures of graphitic materials [24,25]. The XRD pattern of HMB1G3, HMB1G1, and HMB3G1 sample is quite similar as that of HMB, in addition to a weak peak at 27.2°attributed to g-C 3 N 4 .…”

Section: Effect Of Weight Ratio Of Wo 3 On the Photocatalytic Performmentioning

confidence: 95%

Crystalline phase engineering in WO₃/g-C₃N₄ composites for improved photocatalytic performance under visible light

Liang

Zhang

et al. 2020

Mater. Res. Express

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The photocatalytic performance of a semiconductor material is significantly related to its crystalline phase, thus, crystalline phase engineering is of importance for designing the semiconductor composites fabricated between two semiconductor materials. In this work, WO 3 /g-C 3 N 4 composites was taken as an example, we designed and prepared the WO 3 /g-C 3 N 4 composites with different crystalline phases of WO 3 . The important role of the crystalline phase of WO 3 , which is hexagonal phase (h-WO 3 ), monoclinic phase (m-WO 3 ), and mixed phases of h-WO 3 and m-WO 3 on the morphology, photoabsorption property, charge separation efficiency, and photocatalytic activity of the WO 3 /g-C 3 N 4 composites were systematically investigated. By evaluating the photocatalytic degradation of RhB, it is found that the highest photocatalytic activity was achieved by WO 3 /g-C 3 N 4 with 25 wt% h-WO 3 and 75% g-C 3 N 4 (H1G3). The enhanced photocatalytic performance of H1G3 was mainly attributed to the improvement in the separation efficiency of photogenerated electronhole pairs, which was confirmed by surface photovoltage results. Our work sheds a light on the design of composite photocatalysts based on semiconductor oxides.

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Section: Effect Of Weight Ratio Of Wo 3 On the Photocatalytic Performmentioning

confidence: 95%

Crystalline phase engineering in WO₃/g-C₃N₄ composites for improved photocatalytic performance under visible light

Liang

Zhang

et al. 2020

Mater. Res. Express

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“…177 Coupling with other semiconductors Coupling WO X with other semiconductors having unequal band structures is an effective way to facilitate charge transfer and separation and to improve photo-induced redox ability. In the literature, various semiconductors (e.g., chalcogenides, halogenides, salts and carbon nitrides) have been reported to construct heterojunctions with WO X to form efficient photocatalysts, such as WO X /TiO 2 , [178][179][180] 196,197 WO X /g-C 3 N 4 , [198][199][200] etc. For the ease of comparison, the electronic band structures of WO 3 and its typical coupled semiconductors are summarized in Fig.…”

Section: Noble Metal Loadingmentioning

confidence: 99%

Tungsten oxide-based visible light-driven photocatalysts: crystal and electronic structures and strategies for photocatalytic efficiency enhancement

Quan

Gao

Wang

2020

Inorg. Chem. Front.

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“…Fe-doping added peaks at 397. 35 and 398.0 eV corresponding to iron nitride (N-Fe) and (Fe-(CN)), respectively [31], accounting for 4.8 and 4.5% of the total N. The Fe2p spectrum in Figure 2g illustrates that surface Fe represents Fe bonded with nitrogen (Fe-N) at 706.7 eV, FeO at 709.3 eV, and Fe 2 O 3 at 724.0 eV, comprising 37.8%, 36.9%, and 6.4%, respectively [32,33]. No metallic Fe was detected on the surface of Fe-g-C 3 N 4 , confirming that all Fe was completely doped into the g-C 3 N 4 lattice and mainly in the form of Fe-N.…”

Section: Degradation Performance Of the Catalystsmentioning

confidence: 99%

“…The rate constant of the 2 nd Fe-g-C3N4 (0.5424 min −1 ) was the highest among all the materials, which was about 1.46, 1.86, and 2.32 times higher that of the 1 st Fe-g-C3N4 (0.3722 min −1 ), 2 nd g-C3N4 (0.2921 min −1 ), and 1 st g-C3N4 (0.2335 min −1 ). This phenomenon was likely because iron doping can promote the production of active oxygen species [35]. The effect of pH value was tested with the 2 nd Fe-g-C3N4 only, in the presence of H2O2 ( Figure 4).…”

Section: Degradation Performance Of the Catalystsmentioning

confidence: 99%

Facile Production of a Fenton-Like Photocatalyst by Two-Step Calcination with a Broad pH Adaptability

Yang

et al. 2020

Nanomaterials

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A novel heterogeneous Fenton-like photocatalyst, Fe-doped graphitic carbon nitride (Fe-g-C3N4), was produced by facile two-step calcination method. This Fe–g–C3N4 catalyzed rhodamine B degradation in the presence of H2O2 accompanied with visible light irradiation. transmission electron microscopy(TEM), x-ray diffraction (XRD), FT-IR, x-ray photoelectron spectroscopy (XPS), and photoluminescence fluorescent spectrometer (PL) characterization analysis methods were adopted to evaluate the physicochemical property of samples. It can be observed that the Fe-g-C3N4 exhibited excellent photocatalytic Fenton-like activity at a wide pH range of 3–9, with rhodamine B(RhB) degradation efficiency up to 95.5% after irradiation for 45 min in the presence of 1.0 mM H2O2. Its high activity was ascribed to the formation of Fe–N ligands in the triazine rings that accelerated electron movement driving the Fe(III)/Fe(II) redox cycle, and inhibited photo-generated electron hole re-combinations for continuous generation of reactive oxygen species by reactions between Fe(II) and H2O2. The main active oxygen species were hydroxyl radicals, followed by superoxide radicals and hole electrons. This produced catalyst of Fe–g–C3N4 shows excellent reusability and stability, and can be a promising candidate for decontamination of wastewater.

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Fabrication of hierarchical sheet-on-sheet WO3/g-C3N4 composites with enhanced photocatalytic activity

Cited by 58 publications

References 49 publications

Crystalline phase engineering in WO₃/g-C₃N₄ composites for improved photocatalytic performance under visible light

Crystalline phase engineering in WO₃/g-C₃N₄ composites for improved photocatalytic performance under visible light

Tungsten oxide-based visible light-driven photocatalysts: crystal and electronic structures and strategies for photocatalytic efficiency enhancement

Facile Production of a Fenton-Like Photocatalyst by Two-Step Calcination with a Broad pH Adaptability

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Fabrication of hierarchical sheet-on-sheet WO3/g-C3N4 composites with enhanced photocatalytic activity

Cited by 58 publications

References 49 publications

Crystalline phase engineering in WO3/g-C3N4 composites for improved photocatalytic performance under visible light

Crystalline phase engineering in WO3/g-C3N4 composites for improved photocatalytic performance under visible light

Tungsten oxide-based visible light-driven photocatalysts: crystal and electronic structures and strategies for photocatalytic efficiency enhancement

Facile Production of a Fenton-Like Photocatalyst by Two-Step Calcination with a Broad pH Adaptability

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Crystalline phase engineering in WO₃/g-C₃N₄ composites for improved photocatalytic performance under visible light

Crystalline phase engineering in WO₃/g-C₃N₄ composites for improved photocatalytic performance under visible light