Phosphorus and sulfur codoped g-C3N4 as an efficient metal-free photocatalyst

Hu, Chechia; Hung, Wei-Zeng; Wang, Maosheng; Lu, Peirong

doi:10.1016/j.carbon.2017.11.019

Cited by 241 publications

(91 citation statements)

References 54 publications

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“…XPS spectroscopy was applied to further reveal the surface chemical composition and bonding state of different elements (Figure ). In the C 1s spectrum of UCN, three intense peaks appear at binding energy of 284.88, 286.40 and 288.10 eV, which are attributed to the sp 3 C−C from the exotic carbon, C−NH x and N=C−N units in the tri‐s‐triazines of carbon nitride, respectively . According to previous studies, the peaks at 288.24 eV in UCN‐AB and UCN‐APy can be assigned to O=C−N unit .…”

Section: Resultsmentioning

confidence: 78%

“…In the C 1s spectrum of UCN, three intense peaks appear at binding energy of 284.88, 286.40 and 288.10 eV, which are attributed to the sp 3 CÀ C from the exotic carbon, CÀ NH x and N=CÀ N units in the tri-s-triazines of carbon nitride, respectively. [17,24] According to previous studies, the peaks at 288.24 eV in UCN-AB and UCN-APy can be assigned to O=CÀ N unit. [14,38] To quantify the content of different C species, the relative peak area ratios were calculated and listed in Table S2.…”

Section: Full Papersmentioning

confidence: 77%

“…Nevertheless, the photocatalytic performance of pristine g‐C 3 N 4 is greatly limited because of the rapid recombination of photo‐generated electron‐hole pairs and low visible light utilization. Thus, various strategies, including morphology control, heterostructure construction, dye sensitization, and elemental or molecular doping , have been devoted to improving the transfer rate of the photogenerated charge carriers and modifying its band structures.…”

Section: Introductionmentioning

confidence: 99%

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Delocalization of π‐Electron in Graphitic Carbon Nitride to Promote its Photocatalytic Activity for Hydrogen Evolution

Guan

Zhang

2019

ChemCatChem

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Polymers with a large π‐electron conjugated system have aroused extensive concern in photocatalysis due to their appropriate bandgap and high stability. In order to overcome such drawbacks as its inadequate visible light absorption and rapid recombination of the photogenerated electron‐hole pairs of graphic carbon nitride (g‐C3N4), a facile strategy is proposed to tune its electronic structure by grafting small molecules. The conjugated photocatalysts were prepared by attaching 3‐Aminobenzoic acid (AB) and 6‐Aminopyridine‐2‐carboxylic acid (APy) to the framework of g‐C3N4 via low‐temperature condensation. The obtained catalysts UCN‐AB and UCN‐APy possess higher visible light absorption that results from the modified band structure by extending π‐electron delocalization. Additionally, AB and APy worked as the electron acceptors which further enhance transport of the photogenerated electrons. The optimal UCN‐AB and UCN‐APy accomplished remarkable photocatalytic hydrogen evolution rates of 104.0 and 133.2 μmol/h, respectively, which are nearly four or five times of that over g‐C3N4. This work provides a simple and feasible modification approach to extend π‐electron delocalization in g‐C3N4 with a stronger visible light response and accelerated charge transfer for high photocatalytic hydrogen evolution.

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Section: Resultsmentioning

confidence: 78%

Section: Full Papersmentioning

confidence: 77%

Section: Introductionmentioning

confidence: 99%

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Delocalization of π‐Electron in Graphitic Carbon Nitride to Promote its Photocatalytic Activity for Hydrogen Evolution

Guan

Zhang

2019

ChemCatChem

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“…Extensive studies and reviews have investigated the synthesis, structural engineering, doping, heterocomposites, and pre‐ and post‐treatments of g‐C 3 N 4 ‐based compounds for photocatalytic applications . Generally, bulk g‐C 3 N 4 can be synthesized through the thermal condensation of various precursors with R‐C‐NH 2 units, including melamine, cyanamide, dicyandiamide, thiourea, urea, and mixtures thereof .…”

Section: Introductionmentioning

confidence: 99%

Recent Developments in Graphitic Carbon Nitride Based Hydrogels as Photocatalysts

Lin

Yang

2019

ChemSusChem

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Solar‐driven photocatalysis with graphitic carbon nitride (g‐C3N4) is considered to be the most promising approach for the generation of H2 from water, the degradation of organic pollutants, and the reduction of CO2. However, bulk g‐C3N4 exhibits several drawbacks, such as a low specific surface area, high defect density, and fast charge recombination, which result in low photocatalytic performance. The construction of 3D porous hydrogels for g‐C3N4 through nanostructural engineering is a rapid, feasible, and cost‐effective technique to improve the adsorption capability, stability, and separability of the hydrogel composite; to increase the number of active sites; and to create an internal conductive path for facile charge transfer and high photocatalytic activity. This minireview summarizes recent progress in photocatalytic water splitting and dye degradation by using g‐C3N4‐based hydrogels, with respect to state‐of‐the‐art methods for synthesis, preparation, modification, and multicomponent coupling. Furthermore, comprehensive outlooks, future challenges, and concluding remarks regarding the use of g‐C3N4‐based hydrogels as highly efficient photocatalysts are presented.

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“…Semiconductor photocatalysis technology is regarded as a green and promising strategy that uses solar energy to solve the energy crisis and environmental pollution problems faced by human beings. [1][2][3] Fujishima and Honda successfully used a TiO 2 photocatalyst for water splitting in 1972, 4 which marked the beginning of a new era in the eld of photocatalysis. At present, photocatalysts such as titanium dioxide (TiO 2 ), 5 zinc oxide (ZnO), 6 graphene carbonitride (g-C 3 N 4 ), 7 bismuth oxide (Bi 2 O 3 ), 8 cadmium sulde (CdS), 9 and layered metal hydroxides, 10 have been used in the eld of photocatalysis.…”

Section: Introductionmentioning

confidence: 99%

Facile one-pot synthesis of Mg-doped g-C₃N₄ for photocatalytic reduction of CO₂

Xinyue

Zhang

et al. 2019

RSC Adv.

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Graphitic carbon nitride (g-C 3 N 4 ) has attracted wide attention due to its potential in solving energy and environmental issues. However, rapid charge recombination and a narrow visible light absorption region limit its performance. In our study, Mg-doped g-C 3 N 4 was synthesized through a facile one-pot strategy for CO 2 reduction. After Mg doping, the light utilization efficiency and photo-induced electron-hole pair separation efficiency of the catalysts were improved, which could be due to the narrower band gap and introduced midgap states. The highest amounts of CO and CH 4 were obtained on Mg-CN-4% under ultraviolet light illumination, which were about 5.1 and 3.8 times that of pristine g-C 3 N 4 , respectively; the yield of CO and CH 4 reached 12.97 and 7.62 mmol g À1 under visible light irradiation. Our work may provide new insight for designing advanced photocatalysts in energy conversion applications.

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Phosphorus and sulfur codoped g-C3N4 as an efficient metal-free photocatalyst

Cited by 241 publications

References 54 publications

Delocalization of π‐Electron in Graphitic Carbon Nitride to Promote its Photocatalytic Activity for Hydrogen Evolution

Delocalization of π‐Electron in Graphitic Carbon Nitride to Promote its Photocatalytic Activity for Hydrogen Evolution

Recent Developments in Graphitic Carbon Nitride Based Hydrogels as Photocatalysts

Facile one-pot synthesis of Mg-doped g-C₃N₄ for photocatalytic reduction of CO₂

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Phosphorus and sulfur codoped g-C3N4 as an efficient metal-free photocatalyst

Cited by 241 publications

References 54 publications

Delocalization of π‐Electron in Graphitic Carbon Nitride to Promote its Photocatalytic Activity for Hydrogen Evolution

Delocalization of π‐Electron in Graphitic Carbon Nitride to Promote its Photocatalytic Activity for Hydrogen Evolution

Recent Developments in Graphitic Carbon Nitride Based Hydrogels as Photocatalysts

Facile one-pot synthesis of Mg-doped g-C3N4 for photocatalytic reduction of CO2

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Product

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Facile one-pot synthesis of Mg-doped g-C₃N₄ for photocatalytic reduction of CO₂