One-step synthesis of novel K+ and cyano groups decorated triazine-/heptazine-based g-C3N4 tubular homojunctions for boosting photocatalytic H2 evolution

Yang, Jian; Liang, Yujun; Li, Kai; Yang, Gui; Wang, Kun; Xu, Rui; Xie, Xianjun

doi:10.1016/j.apcatb.2019.118252

Cited by 196 publications

(95 citation statements)

References 64 publications

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“…[ 29 ] Fourier transform infrared (FTIR) spectra further provide the detailed structure information (Figure 1d). [ 30 ] For GCN, the absorption band in the range of 1200–1700 cm −1 is assigned to the stretching vibration of NCN in the melon framework and the peak at 810 cm −1 is the out‐of‐plane bending vibration of heptazine rings, these two characteristic absorptions indicate the successful preparation of GCN. [ 31 ] In comparison, a prominent absorption band at 2170 cm −1 verifies the existence of cyano group (CN) defects in DCN, which can further enhance the dispersity by breaking the hydrogen bonding among each DCN NPs.…”

Section: Resultsmentioning

confidence: 99%

Defect‐Engineered Nanozyme‐Linked Receptors

Wen

et al. 2021

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Though nanozymes are successfully applied in various areas, the increasing demands facilitate the exploitation of nanozymes possessing higher activity and more functions. Natural enzyme‐linked receptors (ELRs) are critical components for signal transductions in vivo by expressing activity variations after binding with ligands. Inspired by this, the defect‐engineered carbon nitrides (DCN) are reported to serve as nanozyme‐linked receptors (NLRs). For one thing, cyano defects increase the enzyme‐like activity by a factor of 109.5. For another, DCN‐based NLRs are constructed by employing cyano groups as receptors, and variable outputs are ensued upon the addition of ion ligands. Significantly, both the cascade effect and electronic effect are demonstrated to contribute to this phenomenon. Finally, NLRs are used for pattern recognition of metal ions, indicating the signal transduction ability of NLRs as well. This work not only provides great promise of defect engineering in nanozymes, but also contributes to the design of artificial ELRs.

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Section: Resultsmentioning

confidence: 99%

Defect‐Engineered Nanozyme‐Linked Receptors

Wen

et al. 2021

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“…Accordingly, the bulk g‐C 3 N 4 sample exhibits multiple IR bands in the range of 1300–1700 cm −1 , contributing to C−N and C=N heterocyclic stretching vibration of s‐triazine/heptazine units, [25] whereas the peak centered at around 810 cm −1 represents the out‐of‐plane bending mode of heptazine rings. However, the intensity of these peaks is decreased for the CN−KNa sample, which possibly causes by incorporating K + ions into the carbon nitride framework affected the stretching of C−N bonds [26] . For the sample CN−KNa, a new peak appeared at 2175 cm −1, corresponding to an asymmetric stretching vibration of terminal cyano groups (−C≡N).…”

Section: Resultsmentioning

confidence: 98%

Graphitic Carbon Nitride (g‐C₃N₄) Nanosheets as a Multipurpose Material for Detection of Amines and Solar‐Driven Hydrogen Production

Nguyen

2021

ChemPhotoChem

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Graphitic carbon nitride nanosheets decorated by multiple functional groups (denoted as CN−KNa) were as a multipurpose material, both in photocatalytic applications and as a photo‐induced indicator. The presented g‐C3N4 is fabricated via a facile alkali‐salt‐assisted calcination method. The structural analysis reveals significant changes in the structure of the host CN−KNa nanosheets associated with the existence of multiple functional groups (for example, hydroxy, carbonyl, and cyano groups). Such modifications lead to enhanced light absorption and charge separation, resulting in an efficient photocatalyst not only for solar‐driven hydrogen production but also for primary amine detection in aqueous solution. Thus, the solar light driven photocatalytic hydrogen evolution yield using the synthesized CN−KNa sample is found to be 50.3 μmol h−1, which is approximately 14 times higher than that of bulk g‐C3N4. More importantly, this functional‐group‐decorated CN−KNa facilitated electron transportation between CN−KNa and amine compounds, causing a colour change in the solution mixture, which has been observed for the first time. This novel observation indicates that CN−KNa can be considered a new class of photo‐induced indicator agent to detect primary amine compounds in aqueous solution.

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“…Similarly, Zhao, Qu, Yang, also synthesized alkali metal doped CN by this method. [ 46,48,55 ] In addition to alkali metal doping, MSM can realize the doping of other metals by changing the type of salt. Fang et al [ 83 ] prepared a green polycarbonitride by thermal polymerization of dicyandiamide and excess sodium iodide (Figure 7b).…”

Section: Advantages Of Msm For Photocatalyst Synthesismentioning

confidence: 99%

“…This method combines the advantages of solid‐state synthesis and solution synthesis, and shows great application value in improving crystallinity, [ 28–31 ] adjusting morphology, [ 32–37 ] promoting heterojunction formation [ 35,38–42 ] and assisting doping, [ 43–48 ] etc. As a simple and efficient material synthesis method, MSM will promote the further development of photocatalytic technology.…”

Section: Introductionmentioning

confidence: 99%

Molten‐Salt Technology Application for the Synthesis of Photocatalytic Materials

Luo

Wang

et al. 2021

Energy Tech

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Most of the photocatalytic materials are prepared by wet chemical methods and calcination methods. These preparation methods usually have the problems of slow reaction speed and low crystallinity of products, which seriously restrict the development of photocatalytic technology. Molten salt method (MSM) has attracted much attention of researchers because of its unique advantages in optimizing the synthesis route of photocatalyst. Herein, the application of molten salt technology in the preparation of photocatalytic materials in recent years is summarized. The advantages of MSM in photocatalytic synthesis, such as promoting crystallization, adjusting morphology, accelerating the construction of heterostructure, stabilizing single atom, doping auxiliary elements and adjusting defect position, are also discussed in detail. It is indicated that MSM has important application potential in the preparation of photocatalytic materials. Meanwhile, the research achievements and existing problems of MSM are summarized, and suggestions for further application of MSM in photocatalyst's preparation are put forward.

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One-step synthesis of novel K+ and cyano groups decorated triazine-/heptazine-based g-C3N4 tubular homojunctions for boosting photocatalytic H2 evolution

Cited by 196 publications

References 64 publications

Defect‐Engineered Nanozyme‐Linked Receptors

Defect‐Engineered Nanozyme‐Linked Receptors

Graphitic Carbon Nitride (g‐C₃N₄) Nanosheets as a Multipurpose Material for Detection of Amines and Solar‐Driven Hydrogen Production

Molten‐Salt Technology Application for the Synthesis of Photocatalytic Materials

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One-step synthesis of novel K+ and cyano groups decorated triazine-/heptazine-based g-C3N4 tubular homojunctions for boosting photocatalytic H2 evolution

Cited by 196 publications

References 64 publications

Defect‐Engineered Nanozyme‐Linked Receptors

Defect‐Engineered Nanozyme‐Linked Receptors

Graphitic Carbon Nitride (g‐C3N4) Nanosheets as a Multipurpose Material for Detection of Amines and Solar‐Driven Hydrogen Production

Molten‐Salt Technology Application for the Synthesis of Photocatalytic Materials

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Graphitic Carbon Nitride (g‐C₃N₄) Nanosheets as a Multipurpose Material for Detection of Amines and Solar‐Driven Hydrogen Production