Fabrication of a ternary heterostructure BiVO4 quantum dots/C60/g-C3N4 photocatalyst with enhanced photocatalytic activity

Wang, Jingbo; Liu, Chang; Yang, Shuang; Lin, Xue; Shi, Weilong

doi:10.1016/j.jpcs.2019.109164

Cited by 157 publications

(43 citation statements)

References 44 publications

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“…26,27 The absorption bands between 1200 and 1700 cm −1 denote the stretching vibration modes of C─N and C═N. 28,29 Another wide absorption band between 3000 and 3650 cm −1 is the result of the stretching vibration of terminal ─NH groups. 30,31 For TiO 2 , the broad peak at c. 600 cm −1 represents the Ti─O─Ti stretching band.…”

Section: Resultsmentioning

confidence: 99%

Fabrication of TiO₂/high‐crystalline g‐C₃N₄ composite with enhanced visible‐light photocatalytic performance for tetracycline degradation

Guo

Sun

Huang

et al. 2020

J of Chemical Tech & Biotech

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BACKGROUND The construction of heterojunction between two‐phase semiconductors is a crucial tactic to enhance photocatalytic activity due to its efficient charge separation. RESULT In this work, a novel TiO2/high‐crystalline g‐C3N4 (HCCN) heterojunction photocatalyst was synthesized successfully via a simply hydrothermal method, which was composed of TiO2 nanoparticles distributed on the surface of the HCCN nanosheets. The microstructure and morphology of TiO2/HCCN heterojunction were investigated by various characteristic techniques (such as X‐ray diffraction, transmission electron microscopy and Fourier transform infrared). The photocatalytic performance of as‐prepared photocatalysts was tested though the degradation of tetracycline (10 mg L−1) under visible light irradiation (λ > 420 nm). Significantly, the 50% TiO2/HCCN composite photocatalyst (mass fraction of TiO2 is 50%) exhibited the optimum photocatalytic activity (90%, 120 min), and the corresponding reaction rate constant was around 12 times and 54 times higher than those of pristine HCCN and TiO2, respectively. CONCLUSION The excellent photocatalytic performance was attributed mainly to the synergistic effect of the TiO2/HCCN heterojunction as follows: (i) enhanced light absorption capacity; (ii) improved separation and migration of electron–hole pairs; (iii) extended lifetime of photogenerated carriers. This current study extends our knowledge towards constructing other HCCN‐based nanocomposites with extraordinary photocatalytic performance for addressing environmental problems. © 2020 Society of Chemical Industry

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Section: Resultsmentioning

confidence: 99%

Fabrication of TiO₂/high‐crystalline g‐C₃N₄ composite with enhanced visible‐light photocatalytic performance for tetracycline degradation

Guo

Sun

Huang

et al. 2020

J of Chemical Tech & Biotech

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“…The HRTEM image (Fig. (c)) of KNO/CNx composite exhibits that KNO lattice fringe spacing is 0.284 nm, corresponding to KNO plane (111), but the lattice fringes cannot be observed by CNx because of its low crystallinity . Additional high‐angle annular dark‐field imaging scanning transmission electron microscopy (HAADF‐STEM) and cross‐section elemental mapping images for 3% KNO/CNx composite are shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

Enhancement of visible‐light photocatalytic degradation performance over nitrogen‐deficient g‐C₃N₄/KNbO₃ heterojunction photocatalyst

Shi

Shu

Huang

et al. 2020

J of Chemical Tech & Biotech

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BACKGROUND The formation of heterojunction is an effective mean for increasing the photocatalytic activity of single‐phase semiconductor photocatalyst. RESULTS In this report, KNbO3/N‐defected g‐C3N4 (KNO/CNx) composites were prepared by an impregnation heat method. The optimized photocatalyst 3% KNO/CNx possesses excellent photocatalytic activity (100 mL, 10 mg/L; 84% degradation within 120 min) in the degradation of tetracycline (TC) under visible light (λ > 420 nm), and it can reach about 125, 10.71 and 3.75 times the degradation kinetic constants, compared with KNO, CN, and CNx, respectively. Furthermore, 3% KNO/CNx possesses relatively high stability during the entire photoreaction process. CONCLUSION This enhanced photocatalytic activity of KNO/CNx is mainly ascribed to the synergistic effect between the heterojunction and defect engineering, which expand the visible‐light adsorption and accelerate the separation efficiency of photo‐induced electron–hole pairs. The research is expected to be used to improve the structure and properties of KNO‐based composites, which provides a possibility for practical application of environmental restoration. © 2020 Society of Chemical Industry

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“…It has been widely accepted that the photoinduced holes (h + ), $O 2 À , and $OH radicals 44 are the several reactive substances in the photocatalytic process. 45 Thus, catalase, Cr(VI), Na 2 C 2 O 4 , isopropanol 46 the contribution of h + to removal rate of MPB was 74.41%. The results indicated that the holes were the most important component in the photolysis of MPB.…”

Section: Mechanistic Studiesmentioning

confidence: 94%

An efficient and robust exfoliated bentonite/Ag₃PO₄/AgBr plasmonic photocatalyst for degradation of parabens

Yang

Shi

et al. 2020

RSC Adv.

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Efficient visible-light-driven heterojunction photocatalysts have attracted broad interest owing to their promising adsorption and degradation performances in the removal of organic pollutants. In this study, a mesoporous exfoliated bentonite (EB)/Ag 3 PO 4 /AgBr (30%) photocatalyst was obtained by stripping and exfoliating bentonite as the support for loading Ag 3 PO 4 and AgBr. The particle size ranges of Ag 3 PO 4 and AgBr were about 10-30 nm and 5-10 nm, respectively. The exfoliated bentonite could greatly improve the dispersion and adsorption of Ag 3 PO 4 and AgBr, and significantly enhance the stability of the material during paraben photodegradation. 0.2 g L À1 methylparaben (MPB) was completely decomposed over the EB/Ag 3 PO 4 /AgBr (30%) in 40 min under visible light irradiation. In addition, the photocatalytic activity of EB/Ag 3 PO 4 /AgBr (30%) remained at about 91% after five recycling runs manifesting that EB/Ag 3 PO 4 /AgBr (30%) possessed excellent stability. Radical quenching tests revealed that holes (h + ) and hydroxyl radicals ($OH) were the major radicals. They attacked the side chain on the benzene ring of parabens, which were gradually oxidized to the intermediates, such as benzoic acid, 3-hydroxybenzoic acid, 4hydroxybenzoic acid, azelaic acid, and eventually became CO 2 and H 2 O. The enhancement of photocatalytic activity and photo-stability could be ascribed to the stable structural characteristics, enlarged surface area, high absorption ability, and improved light absorption ability from loading Ag 3 PO 4 onto EB. Meanwhile, the matched energy levels of Ag 3 PO 4 and AgBr made the photoelectron-hole pairs separate and transfer effectively at the interfaces. As a result, the photocatalytic properties of EB/ Ag 3 PO 4 /AgBr (30%) composites were enhanced.

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Fabrication of a ternary heterostructure BiVO4 quantum dots/C60/g-C3N4 photocatalyst with enhanced photocatalytic activity

Cited by 157 publications

References 44 publications

Fabrication of TiO₂/high‐crystalline g‐C₃N₄ composite with enhanced visible‐light photocatalytic performance for tetracycline degradation

Fabrication of TiO₂/high‐crystalline g‐C₃N₄ composite with enhanced visible‐light photocatalytic performance for tetracycline degradation

Enhancement of visible‐light photocatalytic degradation performance over nitrogen‐deficient g‐C₃N₄/KNbO₃ heterojunction photocatalyst

An efficient and robust exfoliated bentonite/Ag₃PO₄/AgBr plasmonic photocatalyst for degradation of parabens

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Fabrication of a ternary heterostructure BiVO4 quantum dots/C60/g-C3N4 photocatalyst with enhanced photocatalytic activity

Cited by 157 publications

References 44 publications

Fabrication of TiO2/high‐crystalline g‐C3N4 composite with enhanced visible‐light photocatalytic performance for tetracycline degradation

Fabrication of TiO2/high‐crystalline g‐C3N4 composite with enhanced visible‐light photocatalytic performance for tetracycline degradation

Enhancement of visible‐light photocatalytic degradation performance over nitrogen‐deficient g‐C3N4/KNbO3 heterojunction photocatalyst

An efficient and robust exfoliated bentonite/Ag3PO4/AgBr plasmonic photocatalyst for degradation of parabens

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Resources

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Fabrication of TiO₂/high‐crystalline g‐C₃N₄ composite with enhanced visible‐light photocatalytic performance for tetracycline degradation

Fabrication of TiO₂/high‐crystalline g‐C₃N₄ composite with enhanced visible‐light photocatalytic performance for tetracycline degradation

Enhancement of visible‐light photocatalytic degradation performance over nitrogen‐deficient g‐C₃N₄/KNbO₃ heterojunction photocatalyst

An efficient and robust exfoliated bentonite/Ag₃PO₄/AgBr plasmonic photocatalyst for degradation of parabens