In situ fabrication of CDs/g-C3N4 hybrids with enhanced interface connection via calcination of the precursors for photocatalytic H2 evolution

Wang, Ke; Wang, Xuezhao; Pan, Hui; Liu, Yingliang; Xu, Shengang; Cao, Shaokui

doi:10.1016/j.ijhydene.2017.11.003

Cited by 59 publications

(30 citation statements)

References 46 publications

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“…The addition of carbon dots can change the electronic band structure in terms of an enhanced light absorption, tune redox potential of the band structure and improve photoexcited charge transfer [29]. Carbon dots modified CN binary or ternary photocatalysts have been prepared by different approaches for photocatalytic H 2 production and pollutants degradation recently [30][31][32][33][34][35]. In most cases, the carbon dots particles were deposited on bulk CN to construct interlayer heterojunction.…”

Section: Introductionmentioning

confidence: 99%

Boosting photocatalytic oxidation on graphitic carbon nitride for efficient photocatalysis by heterojunction with graphitic carbon units

Abdellatif

Zhang

Wang

et al. 2019

Chemical Engineering Journal

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Graphitic carbon nitride has been considered as a promising metal-free visible light photocatalyst for air pollutants oxidation due to its suitable band-gap energy and higher conduction band edge. Herein, we have developed a facile approach for dramatically downwards shifting band edge positions of carbon nitride up by about 1 eV via in-plane heterojunction with graphitic carbon units to enhance the oxidation capability of the electron holes generated from the valence band. The graphitic carbon units in junction with tri-s-triazine domains were clearly observed and its in-plane hybridization with carbon nitride was formed during the copolymerization using melamine with a small amount of m-phenylenediamine as the precursors. The direct intralayer junction between the tri-s-triazine and the graphitic carbon domain, essentially different with interlayer junction reported in literature, is able to shift downwards the band edge positions via merging electron density of states of carbon nitride with that of graphitic carbon, and thus would be beneficial for separation of photoexcited charge carriers and generation of hydroxyl radicals for the oxidation of pollutants. The hybrid photocatalyst prepared with a small quantity (less than 1%) of m-phenylenediamine and melamine as precursors has shown much enhanced NO oxidation to final products(NO 2 and NO 3-) and increased NO removal 10% than the one from melamine only.

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Section: Introductionmentioning

confidence: 99%

Boosting photocatalytic oxidation on graphitic carbon nitride for efficient photocatalysis by heterojunction with graphitic carbon units

Abdellatif

Zhang

Wang

et al. 2019

Chemical Engineering Journal

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“…The CCTs could efficiently split water under visible light irradiation with an H 2 production rate up to 3538.3 mmol g −1 h −1 and a high quantum yield of 10.94% at 420 nm. Wang et al [102] fabricated CDs/g-C 3 N 4 hybrids via in situ thermal polymerization of precursors, urea, and glucose, which resulted in enhanced photocatalytic H 2 evolution activity under visible-light. CN/G0.5 hybrids exhibited good stability and an optimal H 2 evolution rate (2.34 mmol g −1 h −1 ), which was 4.55-fold higher than that of bulk g-C 3 N 4 (0.51 mmol g −1 h −1 ).…”

Section: Thermal Polymerization Methodsmentioning

confidence: 99%

“…Sunlight-driven photocatalytic technologies provide a promising method to solve these problems [4][5][6]. As a novel strategy to take advantage of solar energy, semiconductor photocatalysts are becoming a scientific research focus due to its environmentally-friendly and energy-efficient characteristics, as compared [102,105]. Copyright American Chemical Society, 2018; Elsevier, 2016; respectively).…”

Section: Introductionmentioning

confidence: 99%

A Review on Quantum Dots Modified g-C3N4-Based Photocatalysts with Improved Photocatalytic Activity

2020

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In the 21st century, the development of sustainable energy and advanced technologies to cope with energy shortages and environmental pollution has become vital. Semiconductor photocatalysis is a promising technology that can directly convert solar energy to chemical energy and is extensively used for its environmentally-friendly properties. In the field of photocatalysis, graphitic carbon nitride (g-C3N4) has obtained increasing interest due to its unique physicochemical properties. Therefore, numerous researchers have attempted to integrate quantum dots (QDs) with g-C3N4 to optimize the photocatalytic activity. In this review, recent progress in combining g-C3N4 with QDs for synthesizing new photocatalysts was introduced. The methods of QDs/g-C3N4-based photocatalysts synthesis are summarized. Recent studies assessing the application of photocatalytic performance and mechanism of modification of g-C3N4 with carbon quantum dots (CQDs), graphene quantum dots (GQDs), and g-C3N4 QDs are herein discussed. Lastly, challenges and future perspectives of QDs modified g-C3N4-based photocatalysts in photocatalytic applications are discussed. We hope that this review will provide a valuable overview and insight for the promotion of applications of QDs modified g-C3N4 based-photocatalysts.

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“…[34] In another study, examined the CQDs/g-C 3 N 4 composite and the excited electrons in the g-C 3 N 4 photocatalyst excited by visible light were transferred to CQDs, thereby providing more efficient separation of electron-gap pairs and increasing hydrogen production efficiency. [35] Moreover, Sui et al (2019) reported that in the photocatalytic hydrogen production reaction carried out in a bare form by TiO 2 photocatalyst, the tendency of electron-hole pairs to join negatively affects the amount of hydrogen production. [36] In our previous studies, CQDs synthesized from edible mushrooms and Gingko biloba to sensitize TiO 2 which used the photocatalytic hydrogen evolution reactions (HERs).…”

Section: Introductionmentioning

confidence: 99%

Green Carbon Dots (GCDs) for Photocatalytic Hydrogen Evolution and Antibacterial Applications

et al. 2021

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Microwave technique was used to synthesize Green Carbon Dots (GCDs) from Aloe vera leaves because of easy to apply, accessible, time‐saving, cheap, safe and environmental‐friendly way. The prepared GCDs/TiO2 composite was obtained via sensitization of TiO2 with the help of GCDs. The characterization of the GCDs/TiO2 was made optically, structurally and morphologically. The photocatalytic hydrogen activity of GCDs/TiO2 was investigated under visible light (λ>420 nm) irradiation in the aqueous solution using triethanolamine (TEOA) sacrificial electron donor. When Pt was used, GCDs/TiO2/Pt showed advanced hydrogen evolution production (1294 μmol g−1 h−1) approximately two‐fold compared to GCDs/TiO2 (718 μmol g−1 h−1). In addition, NIR light‐triggered antibacterial activity of GCDs on Gram‐negative Escherichia coli (E. coli) and Gram‐positive Staphylococcus aureus (S. aureus) were investigated by studying bacterial growth curve and abiotic GSH oxidation assay. GSH oxidation ability of GCDs was increased through NIR light irradiation. According to the bacterial growth curve test, E. coli was found to be more susceptible to our GCDs than S. aureus.

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In situ fabrication of CDs/g-C3N4 hybrids with enhanced interface connection via calcination of the precursors for photocatalytic H2 evolution

Cited by 59 publications

References 46 publications

Boosting photocatalytic oxidation on graphitic carbon nitride for efficient photocatalysis by heterojunction with graphitic carbon units

Boosting photocatalytic oxidation on graphitic carbon nitride for efficient photocatalysis by heterojunction with graphitic carbon units

A Review on Quantum Dots Modified g-C3N4-Based Photocatalysts with Improved Photocatalytic Activity

Green Carbon Dots (GCDs) for Photocatalytic Hydrogen Evolution and Antibacterial Applications

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