Fabrication of Z-scheme plasmonic photocatalyst Ag@AgBr/g-C3N4 with enhanced visible-light photocatalytic activity

Yang, Yuxin; Guo, Wan; Guo, Yingna; Zhao, Yahui; Yuan, Xing; Guo, Yihang

doi:10.1016/j.jhazmat.2014.02.023

Cited by 301 publications

(66 citation statements)

References 48 publications

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“…Based on the above results, the Z-scheme mechanism of the g-C 3 N 4 /Fe-TiO 2 composites is illustrated in Figure 10b to reduce O2 to produce •O2 − [18,49]. Also, it has been observed that the •O2 − was a major reactive specie in the photocatalytic reaction for pure g-C3N4.…”

Section: Photocatalytic Mechanismmentioning

confidence: 80%

“…The reactive species corresponding to both g-C3N4 and Fe-TiO2 were nullified as references, so that the reactive species of 0.05Fe-CT alone could be figured out. The scavengers used in this study were sodium oxalate (OA, 0.5 mmol dm −3 ), pbenzoquinone (BQ, 0.5 mmol dm −3 ), and isopropanol (IPA, 1 mmol dm −3 ) against photogenerated holes (h + ) [49], superoxide anion radicals (•O2 − ) [18], and hydroxyl radicals (•OH) [49], respectively. It needs to be mentioned that the applied concentration of each scavenger did not cause any removal of phenol in the respective control experiment [23].…”

Section: Photocatalytic Mechanismmentioning

confidence: 99%

“…As a result, though the charge separation efficiency of the composite is improved by the heterojunction, the oxidation and reduction abilities of the composite are decreased considerably [14][15][16]. Nevertheless, a coupling of two different semiconductors could lead to a formation of a typical Z-scheme system, in which the photoexcited electrons from the semiconductor with a less negative CB will transfer to the VB of the coupled semiconductor and combine with the photoexcited holes over there [17,18]. A composite following the Z-scheme system exhibits a higher redox capability than either of the components alone, thereby enhancing the charge separation efficiency and increasing the lifetime of charge carries as well.…”

Section: Introductionmentioning

confidence: 99%

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Fabrication of a Z-Scheme g-C3N4/Fe-TiO2 Photocatalytic Composite with Enhanced Photocatalytic Activity under Visible Light Irradiation

Zhu

Murugananthan

et al. 2018

Catalysts

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Abstract:In the present study, a nanocomposite material g-C 3 N 4 /Fe-TiO 2 has been prepared successfully by a simple one-step hydrothermal process and its structural properties were thoroughly studied by various characterization techniques, such as X-ray diffraction (XRD), Fourier Transform Infrared (FTIR) spectroscopy, electron paramagnetic resonance (EPR) spectrum, X-ray photoelectron spectroscopy (XPS), and UV-vis diffuse reflectance spectrometry (UV-vis DRS). The performance of the fabricated composite material towards the removal of phenol from aqueous phase was systematically evaluated by a photocatalytic approach and found to be highly dependent on the content of Fe 3+ . The optimum concentration of Fe 3+ doping that showed a dramatic enhancement in the photocatalytic activity of the composite under visible light irradiation was observed to be 0.05% by weight. The separation mechanism of photogenerated electrons and holes of the g-C 3 N 4 /Fe-TiO 2 photocatalysts was established by a photoluminescence technique in which the reactive species generated during the photocatalytic treatment process was quantified. The enhanced photocatalytic performance observed for g-C 3 N 4 -Fe/TiO 2 was ascribed to a cumulative impact of both g-C 3 N 4 and Fe that extended its spectrum-absorptive nature into the visible region. The heterojunction formation in the fabricated photocatalysts not only facilitated the separation of the photogenerated charge carriers but also retained its strong oxidation and reduction ability.

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Section: Photocatalytic Mechanismmentioning

confidence: 80%

Section: Photocatalytic Mechanismmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Fabrication of a Z-Scheme g-C3N4/Fe-TiO2 Photocatalytic Composite with Enhanced Photocatalytic Activity under Visible Light Irradiation

Zhu

Murugananthan

et al. 2018

Catalysts

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“…In AgBr-supported metal-free g-C 3 N 4 -decorated Nitrogendoped graphene (CN) ternary nanocomposites (ACNNG-x), Z-scheme heterogeneous structure consisting of AgBr and CN with different energy level has been proved to be an effective 2 Deposition Photodegradation of organic pollutants [292] rule to photocatalytic degradation of MO and CO 2 photoreduction under visible light [299][300][301][302][303][304][305]. Two charge carriers separation mechanisms were involved in this system before and after the generation of metallic Ag 0 nanoparticles.…”

Section: Other Photoactive Semiconductormentioning

confidence: 99%

Regulations of silver halide nanostructure and composites on photocatalysis

Fan

Han

Song

et al. 2017

Adv Compos Hybrid Mater

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The silver halides and their corresponding composites would constitute remarkable photocatalytic systems not only in energy production but also in environmental remediation. The major advantage in these silver halides system is that plasma metal Ag 0 species would be spontaneously generated by silver halides under light irradiation, which play dual roles of expanding light absorption range and charge carriers separation. In this tutorial review, the origin and development of silver halides, synthesis methods, construction of composite structures with other materials, photocatalytic applications, and various and controversial mechanisms are all exhaustively described.

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“…The other promising way is to introduce noble metal nanoparticles (Pt, Au, and Ag) into g-C 3 N 4 . Ag nanoparticles are often used to combine with other semiconductors, such as g-C 3 N 4 /Ag/MoS 2 [31], Ag/ Fe 3 O 4 /g-C 3 N 4 [32], g-C 3 N 4 /Ag 2 WO 4 /Ag [33], Ag@AgBr/ g-C 3 N 4 [34], and g-C 3 N 4 /Ag/TiO 2 [35]. The important reasons are that Ag nanoparticles have unique electrical, optical, and magnetic features [36], and a relatively cheap price compared with platinum or gold.…”

mentioning

confidence: 99%

Novel ternary Ag/CeVO4/g-C3N4 nanocomposite as a highly efficient visible-light-driven photocatalyst

Ren

Pan

et al. 2017

J Adv Ceram

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Abstract:The CeVO 4 /graphitic C 3 N 4 composites have exhibited much enhanced photocatalytic property for degrading methylene blue (MB) pollutant under visible light irradiation compared with single-phase g-C 3 N 4 or CeVO 4 . The composite S5 obtained from an optimized mass ratio (5%) of CeVO 4 to dicyanamide (DCDA) exhibits the highest photocatalytic activity. Here, ternary Ag/CeVO 4 /g-C 3 N 4 composites denoted as X%Ag/S5 were prepared by an ultrasonic precipitation method to improve the photocatalytic property of S5. The TEM images show that CeVO 4 and Ag nanoparticles are well distributed on the layered g-C 3 N 4 , which agree well with the XRD results. The UV spectra show that the 7%Ag/S5 sample has the widest absorption range and the enhanced absorption intensity under visible light irradiation. The corresponding band gap of 7%Ag/S5 (2.5 eV) is much lower than that of S5 (2.65 eV). The corresponding k value of 7%Ag/S5 is much higher than those of g-C 3 N 4 and CeVO 4 . The degradation experiments for MB solution suggest that the 7%Ag/S5 sample has the optimal photocatalytic performance, which can degrade MB solution completely within 120 min. The enhanced photocatalytic property of the composites is ascribed to not only the effect of heterojunction structure, but also the surface plasma resonance effect of Ag nanoparticles.

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Fabrication of Z-scheme plasmonic photocatalyst Ag@AgBr/g-C3N4 with enhanced visible-light photocatalytic activity

Cited by 301 publications

References 48 publications

Fabrication of a Z-Scheme g-C3N4/Fe-TiO2 Photocatalytic Composite with Enhanced Photocatalytic Activity under Visible Light Irradiation

Fabrication of a Z-Scheme g-C3N4/Fe-TiO2 Photocatalytic Composite with Enhanced Photocatalytic Activity under Visible Light Irradiation

Regulations of silver halide nanostructure and composites on photocatalysis

Novel ternary Ag/CeVO4/g-C3N4 nanocomposite as a highly efficient visible-light-driven photocatalyst

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