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Photocatalysis

About: Photocatalysis is a research topic. Over the lifetime, 67088 publications have been published within this topic receiving 2145233 citations. The topic is also known as: photocatalyst.


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Journal ArticleDOI
TL;DR: In this article, a novel construction of a heterojunction structure by facet coupling of surface-fluorinated TiO2 (F-TiO2) nanosheet onto g-C3N4 nanosheets as a visible light photocatalyst was achieved through a simple hydrothermal method.
Abstract: Novel construction of a heterojunction structure by facet coupling of surface-fluorinated TiO2 (F-TiO2) nanosheet onto g-C3N4 nanosheet as a visible light photocatalyst was achieved through a simple hydrothermal method. Facet coupled structure between F-TiO2-{0 0 1} nanosheet and g-C3N4-{0 0 2} nanosheet was evidently investigated by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), X-ray photoelectron spectra (XPS), Fourier transform infrared (FT-IR) spectroscopy and UV–vis diffuse reflectance spectroscopy (DRS). The g-C3N4/F-TiO2 facet coupled hybrid with remarkably increased interfacial area presented a significantly enhanced photocatalytic performance in degrading methylene blue (MB) under 410 nm LED light irradiation. The obviously reduced electron–hole recombination rate of hybrid was demonstrated from photoluminescence (PL) spectroscopy measurements and the photoelectrochemical evaluation. An optimal g-C3N4 content has been determined to be 30 wt%, corresponding to apparent pseudo-first-order rate constant kapp of 0.0374 min−1. It is 4.5 times and 13.9 times more than that of pure F-TiO2 nanosheets and commercial P25 photocatalyst, respectively.

309 citations

Journal ArticleDOI
TL;DR: Results are consistent with a proposed charge-transfer mechanism initiated by photoexcitation of surface-complexed fluoroquinolone molecules, and indicate formation of stable organic byproducts that are resistant to further degradation by visible light.
Abstract: This study reports on the photocatalytic transformation of fluoroquinolone antibacterial agents (ciprofloxacin, enrofloxacin, norfloxacin, and flumequine) in aqueous titanium dioxide (TiO2) suspensions irradiated with ultraviolet (UV; λ > 324 nm) or visible light (λ > 400, > 420, or > 450 nm) Visible-light-mediated fluoroquinolone degradation is unexpected from direct photolysis or established TiO2 band gap photoexcitation mechanisms, which both require UV light Visible-light-mediated photocatalysis requires an appropriate conduction band electron acceptor (eg, O2, BrO3-), but is not dependent upon hydroxyl radical, superoxide, or other reactive oxygen species generated upon TiO2 band gap excitation The process slows considerably when fluoroquinolone adsorption is inhibited Whereas fluoroquinolone decomposition in UV-irradiated TiO2 suspensions is accompanied by mineralization, no changes in dissolved organic carbon occur during visible-light-photocatalyzed degradation Results are consistent with a

309 citations

Journal ArticleDOI
TL;DR: This work presents the first report about the facet-dependent photocatalytic performance of bismuth-rich Bi-O-X photocatalyst, synthesizing two Bi5O7I nanosheets with different dominant facets using either molecular precursor hydrolysis or calcination.
Abstract: Bismuth-rich bismuth oxyhalides (Bi–O–X; X = Cl, Br, I) display high photocatalytic reduction activity due to the promoting conduction band potential. In this work, two Bi5O7I nanosheets with different dominant facets were synthesized using either molecular precursor hydrolysis or calcination. Crystal structure characterizations, included X-ray diffraction patterns (XRD), field emission electron microscopy and fast Fourier transformation (FFT) images, showed that hydrolysis and calcination resulted in the dominant exposure of {100} and {001} facets, respectively. Photocatalytic data revealed that Bi5O7I–001 had a higher activity than Bi5O7I–100 for N2 fixation and dye degradation. Photoelectrochemical data revealed that Bi5O7I–001 had higher photoinduced carrier separation efficiency than Bi5O7I–100. The band structure analysis also used to explain the underlying photocatalytic mechanism based on the different conduction band position. This work presents the first report about the facet-dependent photocat...

308 citations

Journal ArticleDOI
Didier Robert1
TL;DR: In this article, the authors reviewed the recent progress of the photocatalytic efficiency of coupled semi-conductors, comparing their efficiency with that of TiO2 alone, and proposed an interparticle electron transfer process by coupling two semiconductors with different redox energy levels to increase the charge separation for corresponding conduction and valence bands.

308 citations

Journal ArticleDOI
TL;DR: In this article, the degradation efficiency of single MP by AOTs results from the combined impact of the water matrix constituents, which can have neutral, inhibiting or promoting effect, depending on the process and the mechanism by which these water components react.

308 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
20241
202310,115
202219,607
20217,090
20206,542
20196,581