Synthesis and characterization of g-C3N4/Ag3VO4 composites with significantly enhanced visible-light photocatalytic activity for triphenylmethane dye degradation

Wang, Shaomang; Li, Dinglong; Sun, Cheng; Yang, Shaogui; Yuan, Guanming; He, Huan

doi:10.1016/j.apcatb.2013.08.008

Cited by 608 publications

(208 citation statements)

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“…In recent years, as a kind of highly visible-light response photocatalyst, Ag-based photocatalysts have been proved to be promisingly efficient photocatalysts and well-known photosensitive materials, such as Ag 2 O [1], Ag 3 PO 4 [2,3], AgX (X = Cl, Br, I) [4][5][6][7][8][9], and Ag 3 VO 4 [10]. Among the Ag-based photocatalysts, Ag 2 CO 3 was reported to possess high-efficient photodegradation ability for Rhodamine B (RhB), Methyl Orange (MO), and Methylene Blue (MB) dyes [11,12].…”

Section: Introductionmentioning

confidence: 99%

Enhanced visible-light photocatalytic activity and stability over g-C3N4/Ag2CO3 composites

et al. 2014

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A facile direct growth method was developed for the fabrication of Ag 2 CO 3 nanoparticles on the surface of g-C 3 N 4 at room temperature. The as-prepared g-C 3 N 4 / Ag 2 CO 3 composites were characterized by X-ray diffraction, Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, transmission electron microscopy with energy dispersion X-ray spectroscopy, UV-vis diffuse reflectance spectroscopy, and photoluminescence spectroscopy. The photocatalytic activities were evaluated by degrading Rhodamine B dye. The results indicated that Ag 2 CO 3 nanoparticles with the size of 5-10 nm were finely distributed on the surface of g-C 3 N 4 sheet, leading to the enhancement of the photocatalytic activity. And when the mass ratio of g-C 3 N 4 to Ag 2 CO 3 was 1:4, the as-prepared composites exhibited the optimum photocatalytic activity, which was approximately 8 and 3 times higher than pure g-C 3 N 4 and Ag 2 CO 3 , respectively. The enhanced photocatalytic performance could be attributed to the synergetic effects between g-C 3 N 4 and Ag 2 CO 3 , including the smaller particle size of Ag 2 CO 3 and high charge separation efficiency of the photogenerated electron-hole pair. More attractively, the stability of Ag 2 CO 3 was improved due to its highly dispersion on g-C 3 N 4 sheet. In addition, based on the experimental results, the Z-scheme mechanism for the photodegradation over g-C 3 N 4 /Ag 2 CO 3 composites was proposed.

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Section: Introductionmentioning

confidence: 99%

Enhanced visible-light photocatalytic activity and stability over g-C3N4/Ag2CO3 composites

et al. 2014

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“…Upon visible light irradiation (420 nm < < 780 nm), sample M1:1 is able to be excited to generate electrons and holes that stay at the bottom of conduction band and top of valance band, respectively. Since the E CB (−0.8 eV) of sample M1:1 is more negative than E(O 2 / • O 2 − ) (−0.33 eV) [42], the electrons tend to react with adsorbed oxygen to produce • O 2 − radicals through an one-electron reaction. However, the E VB (+1.87 eV) is less positive than E( • OH/OH − ) (+1.99 eV) and E( • OH/H 2 O) (+2.37 eV) [33,43] and holes are insufficient to directly oxidize surface water to form • OH radicals.…”

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confidence: 99%

Enhanced visible-light-driven photocatalytic performance of porous graphitic carbon nitride

Chang

Luo

et al. 2015

Applied Surface Science

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a b s t r a c tIn this study, a series of porous graphitic carbon nitride (g-C 3 N 4 ) materials were fabricated through a direct pyrolysis of protonated melamine by nitric acid solution. These as-prepared porous samples were characterized by a collection of analytical techniques. It was found that a proper concentration of nitric acid solution involved facilitated to generate samples in tube-like morphology with numerous pores, identified with X-ray diffraction patterns, FT-IR spectra, SEM, TEM, and BET measurements. These g-C 3 N 4 samples were subjected to photocatalytic degradation of dye Rhodamine B (RhB) in aqueous under visible-light irradiation. Under identical conditions, those porous g-C 3 N 4 samples showed significantly improved catalytic performance in comparison with the sample prepared without the introduction of nitric acid. In particularly, the best candidate, sample M1:1, showed an apparent reaction rate nearly 6.2 times that of the unmodified counterpart. The enhancement of photocatalytic performance could be attributed to the favorable porous structure with the enlarged specific surface area and the suitable electronic structure as well. In addition, ESR measurements were conducted for the sake of proposing a photocatalytic degradation mechanism.

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“…[22,23] Many efforts have been devoted to modifying pure g-C 3 N 4 photocatalysts to increase their photocatalytic activity under visible light irradiation, for example, doping extraneous elements, [24][25][26] designing porous structures, [27][28][29] and coupling with other semiconductors. [30,31] Herein, novel visible light-driven Ag/AgCl/g-C 3 N 4 photocatalysts were synthesized through precipitation in geothermal water. Geothermal energy is natural heat energy stored within the earth's crust, which is primarily attributed to the magma and the decay of radioactive isotopes.…”

Section: Introductionmentioning

confidence: 99%

“…The former peak at 284.8 eV can be ascribed to adventitious contaminants, [53,54] and the latter peak -bonded carbon atoms coordinated to three nitrogen atoms in the g-C 3 N 4 structure. [30,35] The N 1s spectrum is shown in Figure 6 d, and it shows a multimodal feature owing to different nitrogen atom environments. The strongest N 1s peak at 398.7 eV is attributed to sp 2 -hybridized nitrogen (C=NÀC).…”

mentioning

confidence: 99%

“…[34,65] The bandgap of g-C 3 N 4 is 2.72 eV, and the conduction band (CB) and valence band (VB) energy levels of g-C 3 N 4 are approximately À1.13 and 1.59 eV vs. SHE, respectively. [30,34,59] Ag/AgCl is a typical visible light-driven plasmonic photocatalyst because of the strong LSPR of Ag nanoparticles. [66,67] AgCl cannot be excited under visible light irradiation owing to its large bandgap, and the CB and VB energy levels of AgCl are approximately À0.06 and 3.19 eV vs. SHE, respectively.…”

mentioning

confidence: 99%

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Synthesis of the Ag/AgCl/g‐C₃N₄ Composite with High Photocatalytic Activity under Visible Light Irradiation

Yao

Liu

2014

ChemCatChem

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Novel Ag/AgCl/g‐C3N4 composite photocatalysts were synthesized through precipitation in geothermal water at room temperature, in which geothermal water was used as the chlorine source. The results suggested that Ag/AgCl nanoparticles were deposited on the surface of g‐C3N4 sheets with high dispersion and that Ag/AgCl/g‐C3N4 composites show strong absorption in the visible light region. The 50 wt % Ag/AgCl/g‐C3N4 composite demonstrated increased photocatalytic activity for the degradation of organic dyes under visible light irradiation than did pure g‐C3N4 (one component), Ag/AgCl (two component), and the mixture of Ag/AgCl and g‐C3N4. The trapping experiments confirmed that holes and ⋅O2− were the main active species responsible for the photocatalytic process. Finally, a possible photocatalytic mechanism of the charge transfer in Ag/AgCl/g‐C3N4 composites was proposed. This work could provide new insights into the application of cheap geothermal water resources and extend the design of new plasmon‐based photocatalysts.

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Synthesis and characterization of g-C3N4/Ag3VO4 composites with significantly enhanced visible-light photocatalytic activity for triphenylmethane dye degradation

Cited by 608 publications

References 37 publications

Enhanced visible-light photocatalytic activity and stability over g-C3N4/Ag2CO3 composites

Enhanced visible-light photocatalytic activity and stability over g-C3N4/Ag2CO3 composites

Enhanced visible-light-driven photocatalytic performance of porous graphitic carbon nitride

Synthesis of the Ag/AgCl/g‐C₃N₄ Composite with High Photocatalytic Activity under Visible Light Irradiation

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Synthesis and characterization of g-C3N4/Ag3VO4 composites with significantly enhanced visible-light photocatalytic activity for triphenylmethane dye degradation

Cited by 608 publications

References 37 publications

Enhanced visible-light photocatalytic activity and stability over g-C3N4/Ag2CO3 composites

Enhanced visible-light photocatalytic activity and stability over g-C3N4/Ag2CO3 composites

Enhanced visible-light-driven photocatalytic performance of porous graphitic carbon nitride

Synthesis of the Ag/AgCl/g‐C3N4 Composite with High Photocatalytic Activity under Visible Light Irradiation

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Synthesis of the Ag/AgCl/g‐C₃N₄ Composite with High Photocatalytic Activity under Visible Light Irradiation