Facile synthesis of 2D/2D Co3(PO4)2/g-C3N4 heterojunction for highly photocatalytic overall water splitting under visible light

Shi, Weilong; Li, Mingyang; Huang, Xiliu; Ren, Hongji; Yan, Chao

doi:10.1016/j.cej.2019.122960

Cited by 211 publications

(78 citation statements)

References 45 publications

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“…Meanwhile, the hole of CNx remained in the VB position, and the combination of KNO and CNx reduced the photoelectron hole charge rate. Since the VB position of CNx is 1.51 eV, which is lower than the standard oxidation–reduction potential E 0 ( • OH/OH − = +1.99 eV versus normal hydrogen electrode (NHE)), the VB is not sufficient to generate • OH and the hole (h + ) directly reacts with TC. Additionally, the photocatalytic degradation of organic pollutants by RM‐CN can be described as follows:

CNx + hν \to CNx ((),, {normale}^{-}, h^{+})

CN ((), {normale}^{-}) + KNO \to KNO ((), {normale}^{-}) + CN

KNO ((), {normale}^{-}) + O_{2} \to • O_{2}^{-}

• O_{2}^{-} + H^{+} \to • OH

• O_{2}^{-} / • OH / h^{+} + TC \to micromolecules, {CO}_{2}, H_{2} normalO

…”

Section: Resultsmentioning

confidence: 94%

Enhancement of visible‐light photocatalytic degradation performance over nitrogen‐deficient g‐C₃N₄/KNbO₃ heterojunction photocatalyst

Shi

Shu

Huang

et al. 2020

J of Chemical Tech & Biotech

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BACKGROUND The formation of heterojunction is an effective mean for increasing the photocatalytic activity of single‐phase semiconductor photocatalyst. RESULTS In this report, KNbO3/N‐defected g‐C3N4 (KNO/CNx) composites were prepared by an impregnation heat method. The optimized photocatalyst 3% KNO/CNx possesses excellent photocatalytic activity (100 mL, 10 mg/L; 84% degradation within 120 min) in the degradation of tetracycline (TC) under visible light (λ > 420 nm), and it can reach about 125, 10.71 and 3.75 times the degradation kinetic constants, compared with KNO, CN, and CNx, respectively. Furthermore, 3% KNO/CNx possesses relatively high stability during the entire photoreaction process. CONCLUSION This enhanced photocatalytic activity of KNO/CNx is mainly ascribed to the synergistic effect between the heterojunction and defect engineering, which expand the visible‐light adsorption and accelerate the separation efficiency of photo‐induced electron–hole pairs. The research is expected to be used to improve the structure and properties of KNO‐based composites, which provides a possibility for practical application of environmental restoration. © 2020 Society of Chemical Industry

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CNx + hν \to CNx ((),, {normale}^{-}, h^{+})

CN ((), {normale}^{-}) + KNO \to KNO ((), {normale}^{-}) + CN

KNO ((), {normale}^{-}) + O_{2} \to • O_{2}^{-}

• O_{2}^{-} + H^{+} \to • OH

• O_{2}^{-} / • OH / h^{+} + TC \to micromolecules, {CO}_{2}, H_{2} normalO

…”

Section: Resultsmentioning

confidence: 94%

Enhancement of visible‐light photocatalytic degradation performance over nitrogen‐deficient g‐C₃N₄/KNbO₃ heterojunction photocatalyst

Shi

Shu

Huang

et al. 2020

J of Chemical Tech & Biotech

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“…It is worth noting that the (002) peak of HCCN is shifted to 27.7°, implying the decrease in interlayer distance within the graphitic like planar. 23,24 Moreover, the narrower peak represents the increased degree of condensation and crystallization, 25 which demonstrates the formation of HCCN. For the pure TiO 2 [blue line of Fig.…”

Section: Resultsmentioning

confidence: 99%

Fabrication of TiO₂/high‐crystalline g‐C₃N₄ composite with enhanced visible‐light photocatalytic performance for tetracycline degradation

Guo

Sun

Huang

et al. 2020

J of Chemical Tech & Biotech

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BACKGROUND The construction of heterojunction between two‐phase semiconductors is a crucial tactic to enhance photocatalytic activity due to its efficient charge separation. RESULT In this work, a novel TiO2/high‐crystalline g‐C3N4 (HCCN) heterojunction photocatalyst was synthesized successfully via a simply hydrothermal method, which was composed of TiO2 nanoparticles distributed on the surface of the HCCN nanosheets. The microstructure and morphology of TiO2/HCCN heterojunction were investigated by various characteristic techniques (such as X‐ray diffraction, transmission electron microscopy and Fourier transform infrared). The photocatalytic performance of as‐prepared photocatalysts was tested though the degradation of tetracycline (10 mg L−1) under visible light irradiation (λ > 420 nm). Significantly, the 50% TiO2/HCCN composite photocatalyst (mass fraction of TiO2 is 50%) exhibited the optimum photocatalytic activity (90%, 120 min), and the corresponding reaction rate constant was around 12 times and 54 times higher than those of pristine HCCN and TiO2, respectively. CONCLUSION The excellent photocatalytic performance was attributed mainly to the synergistic effect of the TiO2/HCCN heterojunction as follows: (i) enhanced light absorption capacity; (ii) improved separation and migration of electron–hole pairs; (iii) extended lifetime of photogenerated carriers. This current study extends our knowledge towards constructing other HCCN‐based nanocomposites with extraordinary photocatalytic performance for addressing environmental problems. © 2020 Society of Chemical Industry

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“…However, the poor absorption of broadband light and high recombination rate of photoinduced e À -h + pairs hinder the further application of g-C 3 N 4 . [98] Hence, a mass of measures have been taken to boost the photocatalytic efficiency of g-C 3 N 4 , such as doping, [99][100][101] dye sensitization, [102] constructing heterojunctions, [103][104][105] and loading co-catalysts. [103][104][105] In this part, various TMPs are used as classification criteria to clearly illustrate their effects on the photocatalytic performance of g-C 3 N 4 .…”

Section: Tmps/g-c 3 Nmentioning

confidence: 99%

Recent Progress of Transition Metal Phosphides for Photocatalytic Hydrogen Evolution

et al. 2020

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Photocatalytic hydrogen evolution can effectively alleviate the troublesome global energy crisis by converting solar energy into the chemical energy of hydrogen. In order to realize efficient hydrogen generation, a variety of semiconductor materials have been extensively investigated, including TiO2, CdS, g‐C3N4, metal‐organic frameworks (MOFs), and others. In recent years, to achieve higher photocatalytic performance and reach the level of large‐scale industrial applications, photocatalysts decorated with transition metal phosphides (TMPs) have shone brightly because of their low cost, stable physical and chemical properties, and substitution for precious metals of TMPs. This Review highlights the preparation methods and properties associated with photocatalysis of TMPs. Moreover, the H2 generation efficiency of photocatalysts loaded with TMPs and the roles of TMPs in catalytic systems are also studied systematically. Apart from being co‐catalysts, several TMPs can also serve as host catalysts to boost the activity of photocatalytic composites. Finally, the development prospects and challenges of TMPs are put forward, which is valuable for future researchers to expand the application of TMPs in photocatalytic directions and to develop more active photocatalytic systems.

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Facile synthesis of 2D/2D Co3(PO4)2/g-C3N4 heterojunction for highly photocatalytic overall water splitting under visible light

Cited by 211 publications

References 45 publications

Enhancement of visible‐light photocatalytic degradation performance over nitrogen‐deficient g‐C₃N₄/KNbO₃ heterojunction photocatalyst

Enhancement of visible‐light photocatalytic degradation performance over nitrogen‐deficient g‐C₃N₄/KNbO₃ heterojunction photocatalyst

Fabrication of TiO₂/high‐crystalline g‐C₃N₄ composite with enhanced visible‐light photocatalytic performance for tetracycline degradation

Recent Progress of Transition Metal Phosphides for Photocatalytic Hydrogen Evolution

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Facile synthesis of 2D/2D Co3(PO4)2/g-C3N4 heterojunction for highly photocatalytic overall water splitting under visible light

Cited by 211 publications

References 45 publications

Enhancement of visible‐light photocatalytic degradation performance over nitrogen‐deficient g‐C3N4/KNbO3 heterojunction photocatalyst

Enhancement of visible‐light photocatalytic degradation performance over nitrogen‐deficient g‐C3N4/KNbO3 heterojunction photocatalyst

Fabrication of TiO2/high‐crystalline g‐C3N4 composite with enhanced visible‐light photocatalytic performance for tetracycline degradation

Recent Progress of Transition Metal Phosphides for Photocatalytic Hydrogen Evolution

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Enhancement of visible‐light photocatalytic degradation performance over nitrogen‐deficient g‐C₃N₄/KNbO₃ heterojunction photocatalyst

Enhancement of visible‐light photocatalytic degradation performance over nitrogen‐deficient g‐C₃N₄/KNbO₃ heterojunction photocatalyst

Fabrication of TiO₂/high‐crystalline g‐C₃N₄ composite with enhanced visible‐light photocatalytic performance for tetracycline degradation