Enhanced photocatalytic activity of g-C3N4 quantum dots/Bi3.64Mo0.36O6.55 nanospheres composites

Yang, Shuang; Liu, Chang; Wang, Jingbo; Lin, Xue; Hong, Yuanzhi; Guo, Feng; Shi, Junyou

doi:10.1016/j.jssc.2020.121347

Cited by 100 publications

(12 citation statements)

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“…Hence, the intrinsic optical bandgap of CNDM 200 ( E op g = 2.78 eV) is very close to that of UCN ( E op g = 2.72 eV). However, the D‐A modulation by adding DM can lead to some intermediate states (marked in Tauc plots) of CNDM x , [ 51 ] further contributing to the regular diminution of the middle bandgap ( E mid g = 1.68 eV) with the increased DM content. Consequently, CNDM x has extended visible‐light absorption compared with UCN and presents a gradually deepening color from faint yellow to light brown then to dark brown (inset in Figure 5A) with the increased DM content.…”

Section: Resultsmentioning

confidence: 99%

Promoting intramolecular charge transfer of graphitic carbon nitride by donor–acceptor modulation for visible‐light photocatalytic H₂ evolution

Wan

Cao

et al. 2022

Interdisciplinary Materials

133

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To satisfy the requirements of substantial green development, it is urgent to explore an innovative eco‐friendly semiconductor photocatalyst to efficiently achieve visible‐light‐driven photocatalytic H2 evolution (PHE). The strategy of promoting the spatial separation efficiency of photoinduced carriers can essentially enhance the PHE performance of a photocatalyst. Herein, a graphitic carbon nitride (g‐C3N4)‐based donor–acceptor (D‐A) copolymer (CNDMx) is constructed by simple one‐pot thermal polycondensation, using urea and 5,8‐DibroMoquinoxaline (as an electron donor) as precursors. The electron D‐A modulation consequently creates an internal electric field to facilitate the intramolecular charge transfer within the copolymer. A series of experimental characterizations and density functional theory calculations are applied to elucidate the variation and correlation of the structure and PHE performance of the as‐prepared catalysts. It is found that the best average PHE rate of 3012.5 μmol g−1 h−1 can be achieved over the optimal D‐A copolymer under visible‐light (400 < λ < 800 nm) irradiation, which is ~3.3 times that of pure urea‐derived g‐C3N4. The corresponding apparent quantum efficiency is 1.3% at 420 nm. This study provides a protocol for designing effective visible‐light photocatalysts via D‐A modulation of polymeric semiconductors.

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Section: Resultsmentioning

confidence: 99%

Promoting intramolecular charge transfer of graphitic carbon nitride by donor–acceptor modulation for visible‐light photocatalytic H₂ evolution

Wan

Cao

et al. 2022

Interdisciplinary Materials

133

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“…Photoluminescence (PL) spectroscopy was used to investigate the separation and transfer of photoinduced charge produced by semiconductor photocatalysts 45‐49 . Obviously, the emission peak intensity of C‐CN‐5 is lower than that for C‐CN‐0 in Fig.…”

Section: Resultsmentioning

confidence: 99%

One‐step simple green method to prepare carbon‐doped graphitic carbon nitride nanosheets for boosting visible‐light photocatalytic degradation of tetracycline

Shi

et al. 2021

J of Chemical Tech & Biotech

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BACKGROUND Graphitic carbon nitride (g‐C3N4) is a rising star amongst semiconductor photocatalysts. However, rapid recombination of electron–hole pairs and poor visible‐light absorption seriously limit its practical applications in photocatalysis. RESULTS A carbon (C)‐doped g‐C3N4 (C‐CN) photocatalyst was prepared by a simple one‐step thermal polymerization for the degradation of high‐concentration tetracycline (TC) under visible light irradiation. In particular, the C‐CN‐5 sample had the best TC (30 mg L–1) degradation effect, reaching 77% within 60 min. CONCLUSION The photocatalytic performance of C‐CN was enhanced for two main reasons: (i) the doping of C enhances the visible light absorption capacity of g‐C3N4 and (ii) introduction of C promotes higher charge separation efficiency of g‐C3N4. In addition, the reduced toxicity of degraded products of TC over as‐prepared C‐CN photocatalyst was confirmed by a bean sprout cultivation experiment. This work provides a useful design idea for the synthesis of C‐doped g‐C3N4 through a simple and green route. © 2021 Society of Chemical Industry (SCI).

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“…Owing to improved light absorption and charge separation, heterojunction fabrication has been an attractive research hotspot and widely studied in the field of high‐efficiency solar light conversion 6,10,11 . In particular, type II heterostructure photocatalyst systems have been extensively investigated because of their ability to separate electron and hole transfer pathways, which could improve charge carriers’ separation efficiency and extend electron lifetimes, so as to greatly improve photocatalytic activity 12‐14 . In addition, calcination, solvothermal and in situ crystallization methods are usually used to form chemical‐bond contact between two semiconductors, which is conducive to the separation of photoexcited electrons and holes, 15,16 respectively.…”

Section: Introductionmentioning

confidence: 99%

Construction of WSe₂/In₂S₃ heterojunction for boosted photocatalytic performance for the degradation of methylene blue under visible light

Wang

Jing

et al. 2022

J of Chemical Tech & Biotech

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BACKGROUND: The construction of a heterojunction is an effective strategy to enhance the activity of a photocatalyst. RESULTS: WSe 2 /In 2 S 3 photocatalysts with favorable photostability and reusability were prepared via a hydrothermal method. The structural and morphological features of WSe 2 /In 2 S 3 were investigated using scanning electron microscopy and transmission electron microscopy. Photocatalytic performance of WSe 2 /In 2 S 3 was tested by the degradation of methylene blue (MB) under visible light. The optimal degradation rate of MB by WSe 2 /In 2 S 3 reached 92% within 120 min. After eight regeneration cycles, the degradation of WSe 2 /In 2 S 3 still reached 70% and exhibited good photocatalytic stability.CONCLUSION: The enhanced photocatalytic activity is attributed to the formation of heterostructure of WSe 2 /In 2 S 3 , which could effectively separate the photogenerated e − -h + pairs. Meanwhile, the photocatalytic degradation intermediates of MB by WSe 2 / In 2 S 3 heterostructure was investigated by liquid chromatography-mass spectrometry. The results show that the obtained WSe 2 /In 2 S 3 photocatalyst has a promising practical application.

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Enhanced photocatalytic activity of g-C3N4 quantum dots/Bi3.64Mo0.36O6.55 nanospheres composites

Cited by 100 publications

References 50 publications

Promoting intramolecular charge transfer of graphitic carbon nitride by donor–acceptor modulation for visible‐light photocatalytic H₂ evolution

Promoting intramolecular charge transfer of graphitic carbon nitride by donor–acceptor modulation for visible‐light photocatalytic H₂ evolution

One‐step simple green method to prepare carbon‐doped graphitic carbon nitride nanosheets for boosting visible‐light photocatalytic degradation of tetracycline

Construction of WSe₂/In₂S₃ heterojunction for boosted photocatalytic performance for the degradation of methylene blue under visible light

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Enhanced photocatalytic activity of g-C3N4 quantum dots/Bi3.64Mo0.36O6.55 nanospheres composites

Cited by 100 publications

References 50 publications

Promoting intramolecular charge transfer of graphitic carbon nitride by donor–acceptor modulation for visible‐light photocatalytic H2 evolution

Promoting intramolecular charge transfer of graphitic carbon nitride by donor–acceptor modulation for visible‐light photocatalytic H2 evolution

One‐step simple green method to prepare carbon‐doped graphitic carbon nitride nanosheets for boosting visible‐light photocatalytic degradation of tetracycline

Construction of WSe2/In2S3 heterojunction for boosted photocatalytic performance for the degradation of methylene blue under visible light

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Promoting intramolecular charge transfer of graphitic carbon nitride by donor–acceptor modulation for visible‐light photocatalytic H₂ evolution

Promoting intramolecular charge transfer of graphitic carbon nitride by donor–acceptor modulation for visible‐light photocatalytic H₂ evolution

Construction of WSe₂/In₂S₃ heterojunction for boosted photocatalytic performance for the degradation of methylene blue under visible light