In situ synthesis of polymetallic Co-doped g-C3N4 photocatalyst with increased defect sites and superior charge carrier properties

Sun, Baohong; Li, Huijun; Yu, Hong‐Yu; Qian, Dong−Jin; Chen, Meng

doi:10.1016/j.carbon.2017.02.063

Cited by 71 publications

(19 citation statements)

References 56 publications

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“…Simultaneously, the holes in the VB of Nb 6 can migrate to CZS and further to g‐CN because the VB of Nb 6 is positioned lower than those of CZS (2.07 eV) and g‐CN nanosheet (1.57 eV). The CB of Nb 6 (−0.26 eV) is negative to the redox potential of H + /H 2 (E 0 = H + /H 2, 0.00 eV), and therefore the photoexcited electrons can be quickly and effectively transferred to generate H 2 . Besides, the CB of Nb 6 (−0.26 eV) is more negative than the reduction potential of oxygen (E 0 = O 2 / • O 2 − , −0.046 eV), indicating that the photogenerated electrons could reasonably react with adsorbed oxygen on the photocatalyst, generating highly reactive superoxide ( • O 2 − ) radical species, which are confirmed as effective active species in the case of photocatalytic degradation of MO.…”

Section: Resultsmentioning

confidence: 99%

Synthesis of noble‐metal‐free ternary K₇HNb₆O₁₉/Cd_0.5Zn_0.5S/g‐C₃N₄ tandem heterojunctions for efficient photocatalytic performance under visible light

Zhou

Zhao

et al. 2019

Applied Organom Chemis

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Exploring noble-metal-free, highly active and durable catalysts is vital to get to grips with the energy and environmental issues. Herein, we first dexterously design and synthesize a class of ternary Nb 6 /CZS/g-CN photocatalysts for the removal of hexavalent chromium Cr (VI) and organic dye pollutant (MO) from wastewater under visible-light irradiation. A heterojunction Nb 6 -1/CZS/g-CN loaded with 0.01 g K 7 HNb 6 O 19 showed excellent photocatalytic performance, with the MO photodegradation efficiency of 94% in 1 h and the Cr (VI) (150 mg/l) photoreduction efficiency as high as 91% in 2 hr. The main active species were deemed to be O 2 .-. Additionally, the as-prepared ternary heterojunction exhibits superior hydrogen evolution reaction (HER) rate. A heterojunction Nb 6 -4/CZS/g-CN loaded with 0.5 g K 7 HNb 6 O 19 exhibited the highest H 2 evolution rate as high as 1777.86 μmol h −1 g −1 under visible-light illumination, which is increased to 5.7 and 2.7 times that of bare CZS and biphase heterojunction CZS/g-CN . These findings afford a new class of promising low-cost photocatalyst bodying for its huge potential value in sustainable energy development and wastewater treatment.

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Section: Resultsmentioning

confidence: 99%

Synthesis of noble‐metal‐free ternary K₇HNb₆O₁₉/Cd_0.5Zn_0.5S/g‐C₃N₄ tandem heterojunctions for efficient photocatalytic performance under visible light

Zhou

Zhao

et al. 2019

Applied Organom Chemis

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“…Therefore, to gain the improved photocatalytic performance, some strategies have been employed for modifying g-C 3 N 4 . One effective strategy was doped metal (Chen et al, 2009; Sun et al, 2017) or non-metal (Zhou et al, 2015; Li et al, 2016; Thaweesak et al, 2017). The separation rate of photogenerated charge could be effectively enhanced by this method.…”

Section: Introductionmentioning

confidence: 99%

The Improvement of Photocatalysis H2 Evolution Over g-C3N4 With Na and Cyano-Group Co-modification

Liu

Shi

et al. 2019

Front. Chem.

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Na and cyano-group co-modified g-C3N4 was easily synthesized and its physicochemical property was completely analyzed. The results manifested that Na and cyano-group modification could heighten visible light absorbed ability and accelerate photoinduced charge separation. When resultant Na and cyano-group co-modified g-C3N4 was splitting water H2 evolution, its H2 evolution rate was obviously improved. Furthermore, it also kept excellent stable capacity of H2 evolution and stability of chemical structure. Hence, this present study does not only develop an efficient strategy to boost photocatalytic property of g-C3N4 based catalysts, but also provides useful guidance for designing more effective photocatalysts.

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“…Compared with monometal-based nanocatalysts, bimetalsw ith unique electronic structures display greaterp otential in photocatalytic applications. Various bimetallic alloy nanoparticles have been reported,s uch as AuPd, [25,26] AgPd, [27,28] FePd, [29] AgCu, [30] PtNi, [31] and so forth. They exhibit better photocatalytic activities than monometallic catalysts, and possible factorsint he activity enhancement have been investigated.M ajeed et al [28] considered that there is a" synergism effect" between Pd and Ag atoms, that is, Pd can quench photogenerated electrons through the Schottky barrier formation mechanism,a nd the characteristic SPR property of Ag enhances visible light absorption, resulting in theb etter activity of the Pd-Ag/g-C 3 N 4 photocatalyst.…”

Section: Introductionmentioning

confidence: 99%

Advantageous Interfacial Effects of AgPd/g‐C₃N₄ for Photocatalytic Hydrogen Evolution: Electronic Structure and H₂O Dissociation

Zou

et al. 2019

Chemistry A European J

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Bimetallic AgPd nanoparticles have been synthesized before, but the interfacial electronic effects of AgPd on the photocatalytic performance have been investigated less. In this work, the results of hydrogene volution suggest that the bimetallic AgPd/g-C 3 N 4 sample has superiora ctivity to Ag/g-C 3 N 4 and Pd/g-C 3 N 4 photocatalysts. The UV/Vis diffuse reflectances pectroscopy,X -ray photoelectron spectroscopy, CO adsorption diffuse reflectance FTIR spectroscopy,a nd FTIR results demonstrate that in the AgPd/g-C 3 N 4 ,t he surface electronic structures of Pd and Ag are changed, which is beneficial for faster photogenerated electron transfera nd greater H 2 Om olecule adsorption.I nsitu ESR spectra suggest that, under visible light irradiation,t here is more H 2 Odissociation to radicals pecies on the AgPd/g-C 3 N 4 photocatalyst. Furthermore, DFT calculations confirm the interfacial electronic effects of AgPd/g-C 3 N 4 ,that is, Pd dÀ ···Ag d + ,and the activation energyo fH 2 Om olecule dissociation on AgPd/g-C 3 N 4 is the lowest,w hich is the main contributor to the enhanced photocatalytic H 2 evolution.[a] Dr.Supporting information and the ORCID identification number(s) for the author(s) of this article can be found under: https://doi.

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In situ synthesis of polymetallic Co-doped g-C3N4 photocatalyst with increased defect sites and superior charge carrier properties

Cited by 71 publications

References 56 publications

Synthesis of noble‐metal‐free ternary K₇HNb₆O₁₉/Cd_0.5Zn_0.5S/g‐C₃N₄ tandem heterojunctions for efficient photocatalytic performance under visible light

Synthesis of noble‐metal‐free ternary K₇HNb₆O₁₉/Cd_0.5Zn_0.5S/g‐C₃N₄ tandem heterojunctions for efficient photocatalytic performance under visible light

The Improvement of Photocatalysis H2 Evolution Over g-C3N4 With Na and Cyano-Group Co-modification

Advantageous Interfacial Effects of AgPd/g‐C₃N₄ for Photocatalytic Hydrogen Evolution: Electronic Structure and H₂O Dissociation

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In situ synthesis of polymetallic Co-doped g-C3N4 photocatalyst with increased defect sites and superior charge carrier properties

Cited by 71 publications

References 56 publications

Synthesis of noble‐metal‐free ternary K7HNb6O19/Cd0.5Zn0.5S/g‐C3N4 tandem heterojunctions for efficient photocatalytic performance under visible light

Synthesis of noble‐metal‐free ternary K7HNb6O19/Cd0.5Zn0.5S/g‐C3N4 tandem heterojunctions for efficient photocatalytic performance under visible light

The Improvement of Photocatalysis H2 Evolution Over g-C3N4 With Na and Cyano-Group Co-modification

Advantageous Interfacial Effects of AgPd/g‐C3N4 for Photocatalytic Hydrogen Evolution: Electronic Structure and H2O Dissociation

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Synthesis of noble‐metal‐free ternary K₇HNb₆O₁₉/Cd_0.5Zn_0.5S/g‐C₃N₄ tandem heterojunctions for efficient photocatalytic performance under visible light

Synthesis of noble‐metal‐free ternary K₇HNb₆O₁₉/Cd_0.5Zn_0.5S/g‐C₃N₄ tandem heterojunctions for efficient photocatalytic performance under visible light

Advantageous Interfacial Effects of AgPd/g‐C₃N₄ for Photocatalytic Hydrogen Evolution: Electronic Structure and H₂O Dissociation