Fabrication of TiO2 nanofibers assembled by Bi2WO6 nanosheets with enhanced visible light photocatalytic activity

Chen, Guihua; Wang, Yong; Shen, Qingyun; Xiong, Xianqiang; Ren, Shi‐Bin; Dai, Guoliang; Wu, Chunchun

doi:10.1016/j.ceramint.2020.05.224

Cited by 37 publications

(9 citation statements)

References 36 publications

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“…It has been demonstrated that a stronger photocurrent signal indicates that more electrons are produced and separated. 57,71–76 Notably, 10CN/BWO obtains the highest photocurrent density (∼0.252 μA cm −2 ), which is approximately 4.14 and 9.95 times greater than that of BWO (∼0.049 μA cm −2 ) and CN (∼0.023 μA cm −2 ), respectively, confirming the highly efficient charge separation and transfer of the CN/BWO heterojunction.…”

Section: Resultsmentioning

confidence: 76%

In situ construction of a C₃N₅ nanosheet/Bi₂WO₆ nanodot S-scheme heterojunction with enhanced structural defects for the efficient photocatalytic removal of tetracycline and Cr(vi)

Cai

Liu

et al. 2022

Inorg. Chem. Front.

249

158

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Section: Resultsmentioning

confidence: 76%

In situ construction of a C₃N₅ nanosheet/Bi₂WO₆ nanodot S-scheme heterojunction with enhanced structural defects for the efficient photocatalytic removal of tetracycline and Cr(vi)

Cai

Liu

et al. 2022

Inorg. Chem. Front.

249

158

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“…As shown in Supporting Information File 1 , Figure S3, the XPS survey spectrum of the 70%−Bi 2 WO 6 /TiO 2 -NT nanocomposite only displays the signals of Ti, O, Bi, and W. The high-resolution XPS spectrum of the Bi 4f region ( Figure 5a ) shows two peaks at 164.1 and 158.8 eV, which are indexed to the binding energies of Bi 4f 5/2 and Bi 4f 7/2 , respectively, proving the existence of Bi(III) in Bi 2 WO 6 [ 44 ]. The high-resolution XPS spectrum of the W 4f region ( Figure 5b ) represents the spin – orbit split lines of W 4f 5/2 and W 4f 7/2 at 36.7 and 34.9 eV, respectively, indicating the existence of W(VI) in Bi 2 WO 6 [ 45 ]. As displayed in Figure 5c , there are two peaks at 464.1 and 458.3 eV that are attributed to the binding energies of Ti 2p 1/2 and Ti 2p 3/2 in the high-resolution XPS spectrum of the Ti 2p region [ 46 ], which show a distance of 5.8 eV.…”

Section: Resultsmentioning

confidence: 99%

Hierarchical Bi₂WO₆/TiO₂-nanotube composites derived from natural cellulose for visible-light photocatalytic treatment of pollutants

Lin¹,

Yang²,

Huang³

2022

Beilstein J. Nanotechnol.

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A series of Bi2WO6/TiO2-nanotube (Bi2WO6/TiO2-NT) heterostructured composites were prepared by utilizing natural cellulose (e.g., laboratory filter paper) as the structural template. The obtained nanoarchitectonics, namely Bi2WO6/TiO2-NT nanocomposites, displayed three-dimensionally interwoven structures which replicated the initial cellulose template. The composite Bi2WO6/TiO2-NT nanotubes were formed by TiO2 nanotubes that uniformly anchored with Bi2WO6 nanoparticles of various densities on the surface. The composites exhibited improved photocatalytic activities toward the reduction of Cr(VI) and degradation of rhodamine B under visible light (λ > 420 nm), which were attributed to the uniform anchoring of Bi2WO6 nanoparticles on TiO2 nanotubes, as well as strong mutual effects and well-proportioned formation of heterostructures in between the Bi2WO6 and TiO2 phases. These improvements arose from the cellulose-derived unique structures, leading to an enhanced absorption of visible light together with an accelerated separation and transfer of the photogenerated electron–hole pairs of the nanocomposites, which resulted in increased effective amounts of photogenerated carriers for the photocatalytic reactions. It was demonstrated that the photoinduced electrons dominated the photocatalytic reduction of Cr(VI), while hydroxyl radicals and reactive holes contributed to the photocatalytic degradation of rhodamine B.

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“…8c, the spectral absorption range of the prepared sample was analyzed by UV-Vis DRS. With the increase of PDI-Ala content, red shift of the absorption edge of PDI-Ala/S-C3N4 composites increases gradually, indicating that the heterojunction is successfully formed 65 . It has a strong response to almost full-range visible light, which greatly improves the solar energy utilization rate of the composite photocatalyst, and effectively generates more photogenerated carriers.…”

Section: Energy Band Structure Of Photocatalystsmentioning

confidence: 96%

All Organic S-Scheme Heterojunction PDI-Ala/S-C<sub>3</sub>N<sub>4</sub> Photocatalyst with Enhanced Photocatalytic Performance

李喜宝¹,

刘积有²,

黄军同³

et al. 2020

Acta Physico Chimica Sinica

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Organic photocatalysts have attracted attention owing to their suitable redox band positions, low cost, high chemical stability, and good tunability of their framework and electronic structure. As a novel organic photocatalyst, PDI-Ala (N,N'-bis(propionic acid)-perylene-3,4,9,10tetracarboxylic diimide) has strong visible-light response, low valence band position, and strong oxidation ability. However, the low photogenerated charge transfer rate and high carrier recombination rate limit its application. Due to the aromatic heterocyclic structure of g-C3N4 and large delocalized π bond in the planar structure of PDI-Ala, g-C3N4 and PDI-Ala can be tightly combined through π-π interactions and N-C bond. The band structure of sulfur-doped g-C3N4 (S-C3N4) matched well with PDI-Ala than that with g-C3N4. The electron delocalization effect, internal electric field, and newly formed chemical bond jointly promote the separation and migration of photogenerated carriers between PDI-Ala and S-C3N4. To this end, a novel step-scheme (Sscheme) heterojunction photocatalyst comprising organic semiconductor PDI-Ala and S-C3N4 was prepared by an in situ self-assembly strategy. Meanwhile, PDI-Ala was self-assembled by transverse hydrogen bonding and longitudinal π-π stacking. The crystal structure, morphology, valency, optical properties, stability, and energy band structure of the PDI-Ala/S-C3N4 photocatalysts were systematically analyzed and studied by various characterization methods such as X-ray diffraction, transmission electron microscopy, energy dispersive X-ray spectrometry, X-ray photoelectron spectroscopy, ultraviolet visible diffuse reflectance spectroscopy, electrochemical impedance spectroscopy, and Mott-Schottky curve. The work functions and interface coupling characteristics were determined using density functional theory. The photocatalytic activities of the synthesized photocatalyst for H2O2 production and the degradation of tetracycline (TC) and p-nitrophenol (PNP) under visible-light irradiation are discussed. The PDI-Ala/S-C3N4 S-scheme heterojunction with band matching and tight interface bonding accelerates the intermolecular electron transfer and broadens the visible-light response range of the heterojunction. In addition, in the processes of the PDI-Ala/S-C3N4 photocatalytic degradation reaction, a variety of active species (h + , •O2 − , and H2O2) were produced and accumulated. Therefore, the PDI-Ala/S-C3N4 heterojunction exhibited enhanced photocatalytic performance in the degradation of TC, PNP, and H2O2 production. Under visible-light irradiation, the optimum 30%PDI-Ala/S-C3N4 removed 90% of TC within 90 min. In addition, 30%PDI-Ala/S-C3N4 displayed the highest H2O2 evolution rate of 28.3 μmol•h −1 •g −1 , which was 2.9 and 1.6 times higher than those of PDI-Ala and S-C3N4,

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Fabrication of TiO2 nanofibers assembled by Bi2WO6 nanosheets with enhanced visible light photocatalytic activity

Cited by 37 publications

References 36 publications

In situ construction of a C₃N₅ nanosheet/Bi₂WO₆ nanodot S-scheme heterojunction with enhanced structural defects for the efficient photocatalytic removal of tetracycline and Cr(vi)

In situ construction of a C₃N₅ nanosheet/Bi₂WO₆ nanodot S-scheme heterojunction with enhanced structural defects for the efficient photocatalytic removal of tetracycline and Cr(vi)

Hierarchical Bi₂WO₆/TiO₂-nanotube composites derived from natural cellulose for visible-light photocatalytic treatment of pollutants

All Organic S-Scheme Heterojunction PDI-Ala/S-C<sub>3</sub>N<sub>4</sub> Photocatalyst with Enhanced Photocatalytic Performance

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Fabrication of TiO2 nanofibers assembled by Bi2WO6 nanosheets with enhanced visible light photocatalytic activity

Cited by 37 publications

References 36 publications

In situ construction of a C3N5 nanosheet/Bi2WO6 nanodot S-scheme heterojunction with enhanced structural defects for the efficient photocatalytic removal of tetracycline and Cr(vi)

In situ construction of a C3N5 nanosheet/Bi2WO6 nanodot S-scheme heterojunction with enhanced structural defects for the efficient photocatalytic removal of tetracycline and Cr(vi)

Hierarchical Bi2WO6/TiO2-nanotube composites derived from natural cellulose for visible-light photocatalytic treatment of pollutants

All Organic S-Scheme Heterojunction PDI-Ala/S-C<sub>3</sub>N<sub>4</sub> Photocatalyst with Enhanced Photocatalytic Performance

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In situ construction of a C₃N₅ nanosheet/Bi₂WO₆ nanodot S-scheme heterojunction with enhanced structural defects for the efficient photocatalytic removal of tetracycline and Cr(vi)

In situ construction of a C₃N₅ nanosheet/Bi₂WO₆ nanodot S-scheme heterojunction with enhanced structural defects for the efficient photocatalytic removal of tetracycline and Cr(vi)

Hierarchical Bi₂WO₆/TiO₂-nanotube composites derived from natural cellulose for visible-light photocatalytic treatment of pollutants