From Traditional Strategies to Z-scheme Configuration in Graphitic Carbon Nitride Photocatalysts: Recent Progress and Future Challenges

Jourshabani, Milad; Lee, Byeong–Kyu; Shariatinia‬, Zahra

doi:10.1016/j.apcatb.2020.119157

Cited by 132 publications

(48 citation statements)

References 117 publications

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“…Z-scheme-driven photocatalysis is categorized into three main generations, which are explained as follows: Firstly, the redox mediator is driven (IO 3 − /I − , Fe 3+ /Fe 2+ , NO 3 − /NO 2 − , etc.). For the generation-I, the Z-scheme mechanism proceeds via a combination of photo-illuminated electrons in the conduction band of semiconductor-II (SC-II) with holes in the valence band of semiconductor-I (SC-I) (Jourshabani et al, 2020;Bai et al, 2020). This phenomenon leads to the formation of strongly oxidative valence band holes in SC-II and reductive conduction band electrons in SC-I, and enhanced electron-hole pairs separation.…”

Section: Heterojunction G-c 3 N 4 For Enhanced Photocatalytic Activation Of Pds and Pmsmentioning

confidence: 99%

Advanced activation of persulfate by polymeric g-C3N4 based photocatalysts for environmental remediation: A review

Hasija

Nguyen

Kumar

et al. 2021

Journal of Hazardous Materials

329

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Photocatalytic materials for photocatalysis is recently proposed as a promising strategy to address environmental remediation. Metal-free graphitic carbon nitride (g-C 3 N 4 ), is an emerging photocatalyst in sulfate radical based advanced oxidation processes. The solar-driven electronic excitations in g-C 3 N 4 are capable of peroxo (O-O) bond dissociation in peroxymonosulfate/peroxydisulfate (PMS/PDS) and oxidants to generate reactive free radicals, namely SO 4•− and OH • in addition to O 2 •− radical. The synergistic mechanism of g-C 3 N 4 mediated PMS/ PDS photocatalytic activation, could ensure the generation of OH • radicals to overcome the low reductive potential of g-C 3 N 4 and fastens the degradation reaction rate. This article reviews recent work on heterojunction formation (type-II heterojunction and direct Z-scheme) to achieve the bandgap for extended visible light absorption and improved charge carrier separation for efficient photocatalytic efficiency. Focus is placed on the fundamental mechanistic routes followed for PMS/PDS photocatalytic activation over g-C 3 N 4 -based photocatalysts. A particular emphasis is given to the factors influencing the PMS/PDS photocatalytic activation mechanism and the contribution of SO 4 •− and OH • radicals that are not thoroughly investigated and require further studies. Concluding perspectives on the challenges and opportunities to design highly efficient persulfateactivated g-C 3 N 4 based photocatalysts toward environmental remediation are also intensively highlighted.

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Section: Heterojunction G-c 3 N 4 For Enhanced Photocatalytic Activation Of Pds and Pmsmentioning

confidence: 99%

Advanced activation of persulfate by polymeric g-C3N4 based photocatalysts for environmental remediation: A review

Hasija

Nguyen

Kumar

et al. 2021

Journal of Hazardous Materials

329

View full text Add to dashboard Cite

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“…Developing high e ciency photocatalysis based on semiconductor has become a green technology to effectively degrade detrimental organic pollutants and solve environment issues [2,3]. Graphitic carbon nitride (g-C 3 N 4 ) with a metal-free, visible-light response and narrow band gap of 2.7 eV has been attractive as a photocatalyst [4,5]. In addition, the conduction band (CB) potential of g-C 3 N 4 is comparatively negative (-1.15 eV) [5], which can bring higher reduction capability to photoexcited electrons.…”

Section: Introductionmentioning

confidence: 99%

Constructing BiOBr/g-C3N4/Bi2O2CO3 Z-scheme photocatalyst with enhanced photocatalytic activity

Zhang

Liu

Zhou

et al. 2021

J Mater Sci: Mater Electron

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Novel camellia-structured Z-scheme BiOBr/g-C 3 N 4 /Bi 2 O 2 CO 3 was simply prepared by a hydrothermal method and photodegraded Rhodamine B under visible light within 60 min with much higher degradation e ciency (98%) contrasted with pure BiOBr, g-C 3 N 4 and Bi 2 O 2 CO 3 . Radical trapping experiments exhibited the main reactive species (•O 2 -) during degradation process. The formation of Z-scheme heterojunction improved rate of charge separation, enhanced absorption of visible light and thus promoted the photocatalytic activity. The Z-scheme heterojunction is a promising material for the removal of dye in e uents.

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“…The unique physical structure, excellent chemical stability and tunable electronic properties support the photocatalytic activity in environmental applications (Yang et al 2020;Hasija et al 2021). g-C 3 N 4 can be facilely synthesized through the thermal polymerization of low-cost N-rich precursors such as urea, melamine, dicyandiamide, and thiourea (Jourshabani et al 2020;Nguyen et al 2021). Various modification strategies, such as elemental doping, heterojunction, defects engineering and structural regulation, have been reported to improve the properties for potential applications (Chen et al 2020a).…”

Section: Graphical Abstract Introductionmentioning

confidence: 99%

Ultrasound assisted Fenton-like degradation of dyes using copper doped graphitic carbon nitride

Wang

Huang

Sun

et al. 2021

Water Science and Technology

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A novel copper doped graphitic carbon nitride (Cu-C3N4) was successfully synthesized and used as an effective Fenton-like catalyst. Cu-C3N4 was characterized by scanning electron microscopy, surface area analyzer, Fourier transform infrared spectroscopy, X-ray diffractometer, and X-ray photoelectron spectroscopy. Effect of process parameters including catalyst dosage, hydrogen peroxide (H2O2) concentration, solution pH, and initial methylene blue (MB) concentration was investigated to evaluate catalytic performance. The pseudo first-order kinetic model was used to describe the catalytic process. The enhancement of MB degradation is observed assisted by ultrasound. MB degradation of 96% is obtained within 30 min in Cu-C3N4/H2O2/ultrasound system, and the corresponding rate constant is 0.099 min−1. Effective MB degradation is obtained over a broad pH range (3.3–9.9). The catalytic mechanism is examined by ultraviolet-visible spectra, quenching test, and electron spin resonance determination. The dominant mechanism of MB degradation is ascribed to the ultrasonic H2O2 activation by Cu-C3N4 for hydroxyl radical generation. Cu-C3N4 has good reusability and is effective to degrade rhodamine B and acid orange 7. This work not only contributes to the field of wastewater treatment, but also provides insights into the synthesis of Fenton-like catalysts. The results manifest that Cu-C3N4 is a promising Fenton-like catalyst for dye degradation in the field of environmental pollution remediation.

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From Traditional Strategies to Z-scheme Configuration in Graphitic Carbon Nitride Photocatalysts: Recent Progress and Future Challenges

Cited by 132 publications

References 117 publications

Advanced activation of persulfate by polymeric g-C3N4 based photocatalysts for environmental remediation: A review

Advanced activation of persulfate by polymeric g-C3N4 based photocatalysts for environmental remediation: A review

Constructing BiOBr/g-C3N4/Bi2O2CO3 Z-scheme photocatalyst with enhanced photocatalytic activity

Ultrasound assisted Fenton-like degradation of dyes using copper doped graphitic carbon nitride

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