Grafting Fe(III) species on carbon nanodots/Fe-doped g-C3N4 via interfacial charge transfer effect for highly improved photocatalytic performance

Liu, Qiong; Chen, Tianxiang; Guo, Yimin; Zhang, Zhengguo; Fang, Xiaoming

doi:10.1016/j.apcatb.2016.12.028

Cited by 156 publications

(45 citation statements)

References 40 publications

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“…Similar hole behavior was observed when a CoFe 2 O 4 catalyst was used[43,44]. The g-C 3 N 4 CB edge potential is below that of O 2 /H 2 O 2 (which is equal to 0.685 eV vs. NHE)[45]. Thus, •OH can form as a result of the reaction between the adsorbed oxygen and the photogenerated electrons: O 2 +2e − +2H + =…”

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confidence: 59%

Direct Z-scheme GdFeO3/g-C3N4 heterostructures with outstanding photocatalytic activity

Wang

Feng

et al. 2021

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The direct Z-scheme GdFeO3/g-C3N4 photocatalysts used without any mediators were obtained using an ultrasonic synthesis approach. The composites’ structures, elemental composition and morphologies, as well as optical, electrochemical and catalytic properties, were thoroughly analyzed. GdFeO3/g-C3N4-3:7 composite exhibited an excellent enhanced light-harvesting ability and low recombination rate, which manifested into an outstanding visible-light driven activity, 7.7 and 2.3 times more than of stand-alone g-C3N4 and GdFeO3, respectively. A mechanism responsible for the photocatalytic property enhancement was proposed. The stability and reusability of the GdFeO3/g-C3N4 composites make them excellent materials for practical applications related to the removal of organic pollutants from the wastewater.

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confidence: 59%

Direct Z-scheme GdFeO3/g-C3N4 heterostructures with outstanding photocatalytic activity

Wang

Feng

et al. 2021

Preprint

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“…1:2-Ti 4 O 7 /g-C 3 N 4 had the highest photocurrent density of 0.30 μA cm −2 , while the photocurrent density for pure g-C 3 N 4 was only 0.10 μA cm −2 . The enlarged photocurrent density of Ti 4 O 7 /g-C 3 N 4 suggested the more efficient charge carrier (e − -h + ) generation on the Ti 4 O 7 /g-C 3 N 4 surface (Liu et al, 2017 ). Herein, the electrons in the valence band of g-C 3 N 4 were excited upon visible light irradiation and then migrated to the conduction band of Ti 4 O 7 with effectively enhanced efficiency of the charge carrier (e − -h + ) generation and separation (Samanta and Srivastava, 2017 ), which improved the photocatalytic performance as indicated in Figure 4 .…”

Section: Resultsmentioning

confidence: 99%

Ti4O7/g-C3N4 for Visible Light Photocatalytic Oxidation of Hypophosphite: Effect of Mass Ratio of Ti4O7/g-C3N4

et al. 2018

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Hypophosphite wastewater treatment is still a critical issue in metallurgical processes and the oxidation of hypophosphite to phosphate followed by the precipitation of phosphate is an important strategy for hypophosphite wastewater treatment. Herein, Ti4O7/g-C3N4 photocatalysts with various mass ratios (Ti4O7 (m): g-C3N4 (m) = 0.5, 0.2, 0.1, and 0.05) were synthesized by a hydrolysis method and the effect of the mass ratio of Ti4O7 (m): g-C3N4 (m) on Ti4O7/g-C3N4 visible light photocatalytic oxidation of hypophosphite was evaluated. The as-prepared Ti4O7/g-C3N4 were characterized and confirmed by SEM, XPS, XRD and FTIR. Moreover, the specific surface area and the distribution of pore size of Ti4O7/g-C3N4 was also analyzed. Our results showed that Ti4O7/g-C3N4 exhibited remarkably improved photocatalytic performance on hypophosphite oxidation compared with g-C3N4 and meanwhile 1:2-Ti4O7/g-C3N4 with a mass ratio of 0.5 showed the best photocatalytic performance with the highest oxidation rate constant (17.7-fold and 91.0-fold higher than that of pure g-C3N4 and Ti4O7, respectively). The enhanced performance of photocatalytic oxidation of hypophosphite was ascribed to the heterojunction structure of Ti4O7/g-C3N4 with broader light absorption and significantly enhanced efficiency of the charge carrier (e−-h+) generation and separation. Additionally, the generated ·OH and ·O2- radicals contributed to the hypophosphite oxidation during the photocatalytic system.

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“…A clear signal at low magnetic field of 154 mT (g = 4.23) was observed, indicating that iron ions are present in +3 oxidation state. 22 The morphology of K-CN/rGO and Fe(III)-grafted K-CN/rGO was examined by SEM and TEM analyses and the results are depicted in Figure 4a-e. The SEM image of K-CN/rGO Fe(III) shown in Figure 4a indicates that the sheets of graphene and graphitic carbon nitride are clearly seen in the figure.…”

Section: Resultsmentioning

confidence: 99%

Fe(III)-grafted K-doped $$\hbox {g-C}_{{3}}\hbox {N}_{{4}}$$ g-C 3 N 4 /rGO composite photocatalyst with efficient activity towards the degradation of organic pollutants $$^{\S }$$ §

et al. 2018

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The quick recombination of charge carriers and the low oxidizing ability of VB holes of g-C 3 N 4 limits its practical application. Herein, we have synthesized a visible-light sensitive Fe(III)-grafted K-doped g-C 3 N 4 /rGO heterostructure photocatalyst to tackle the above problem so as to achieve enhanced photocatalytic activity. The prepared samples were characterized by standard analytical techniques such as XRD, FT-IR, EPR, SEM, TEM, DRS and PL spectroscopy. EPR analysis reveals that the grafted iron exists in +3 oxidation state in the composite material. As compared to pristine g-C 3 N 4 , surface grafted nanocomposite photocatalyst exhibits excellent photocatalytic performance for the degradation of Rhodamine B (RhB), Methylene Blue (MB) and Methyl Orange (MO) under visible light irradiation. The enhanced activity could be attributed to the creation of defect levels in the band gap, shift of absorption band towards the visible region and intimate interfacial interactions between graphene and g-C 3 N 4 , effectively promoting separation of photoinduced charge carriers. The idea to tune the bandgap of graphitic carbon nitride by introducing alkali metal along with its composite formation with graphene could present a new concept to effectively steer the photocatalytic activity. Keywords. Fe(III)-grafted K-g-C 3 N 4 /rGO; visible light induced photocatalyst; dye degradation.

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Grafting Fe(III) species on carbon nanodots/Fe-doped g-C3N4 via interfacial charge transfer effect for highly improved photocatalytic performance

Cited by 156 publications

References 40 publications

Direct Z-scheme GdFeO3/g-C3N4 heterostructures with outstanding photocatalytic activity

Direct Z-scheme GdFeO3/g-C3N4 heterostructures with outstanding photocatalytic activity

Ti4O7/g-C3N4 for Visible Light Photocatalytic Oxidation of Hypophosphite: Effect of Mass Ratio of Ti4O7/g-C3N4

Fe(III)-grafted K-doped $$\hbox {g-C}_{{3}}\hbox {N}_{{4}}$$ g-C 3 N 4 /rGO composite photocatalyst with efficient activity towards the degradation of organic pollutants $$^{\S }$$ §

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