In-situ one-step synthesis of porous monolayer carbon nitride nanosheets doped with carbon quantum dots for photocatalytic degradation of Meloxicam

Wang, Yongqiang; Zhang, Mengdan; Zhao, Jiamin; Chen, Chen; Zhou, Yingying; Zheng, Xin; Zhang, Conglu

doi:10.1016/j.colsurfa.2022.129042

Cited by 8 publications

(7 citation statements)

References 40 publications

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“…In addition, a sharp dividing line in the HRTEM image further exhibited the coexistence of g-C 3 N 4 and CQDs nanoparticles, which confirmed that CQDs homogeneously combined with g-C 3 N 4 . The micro-regional heterostructures between CQDs and g-C 3 N 4 could effectively enhance different orientation intrinsic driving forces to accelerate the separation and transfer of photogenerated charges [ 42 ].…”

Section: Resultsmentioning

confidence: 99%

“…Further, we used the peak-splitting simulation method to understand the chemical properties. In the high-resolution XPS spectra of C 1s ( Figure 6 b), four peaks located at 285.1, 286.0, 288.7 and 294.1 eV were ascribed to graphitic carbon (C=C) of CQDs, a small quantity of C-O species, sp 2 hybridized carbon (N-C=N) of g-C 3 N 4 and π-excitation, respectively [ 42 , 46 ]. The spectra of N 1s ( Figure 6 c) could be fitted into four peaks at 398.9, 399.8, 401.2 and 404.5 eV, which could be assigned to sp 2 hybridized aromatic N (C-N=C) in triazine rings, tertiary N in N-(C) 3 and amino groups (N-H), π-excitation, respectively [ 40 , 47 ].…”

Section: Resultsmentioning

confidence: 99%

“…The spectra of N 1s ( Figure 6 c) could be fitted into four peaks at 398.9, 399.8, 401.2 and 404.5 eV, which could be assigned to sp 2 hybridized aromatic N (C-N=C) in triazine rings, tertiary N in N-(C) 3 and amino groups (N-H), π-excitation, respectively [ 40 , 47 ]. The spectra of O 1s ( Figure 6 d) could be fitted into two peaks at 531.7 and 533.4 eV, which could be assigned to C-O and O-H of lattice oxygen and adsorbed water, respectively [ 42 , 46 ]. In the whole spectrum, no characteristic peak related to any other element was observed both in modified PCL-g-C 3 N 4 /CQDs electrospun membranes and g-C 3 N 4 /CQDs composites indicating this metal-free material can avoid the release of poisonous metal ions during practical application.…”

Section: Resultsmentioning

confidence: 99%

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Enhancement of AFB1 Removal Efficiency via Adsorption/Photocatalysis Synergy Using Surface-Modified Electrospun PCL-g-C3N4/CQDs Membranes

et al. 2023

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Aflatoxin B1 (AFB1) is a highly toxic mycotoxin produced by aspergillus species under specific conditions as secondary metabolites. In this study, types of PCL (Polycaprolactone) membranes anchored (or not) to g-C3N4/CQDs composites were prepared using electrospinning technology with (or without) the following surface modification treatment to remove AFB1. These membranes and g-C3N4/CQDs composites were characterized by SEM, TEM, UV-vis, XRD, XPS and FTIR to analyze their physical and chemical properties. Among them, the modified PCL-g-C3N4/CQDs electrospun membranes exhibited an excellent ability to degrade AFB1 via synergistic effects of adsorption and photocatalysis, and the degradation rate of 0.5 μg/mL AFB1 solution was observed to be up to 96.88% in 30 min under visible light irradiation. Moreover, the modified PCL-g-C3N4/CQDs electrospun membranes could be removed directly after the reaction process without centrifugal or magnetic separation, and the regeneration was a green approach synchronized with the reaction under visible light avoiding physical or chemical treatment. The mechanism of adsorption by electrostatic attraction and hydrogen bonding interaction was revealed and the mechanism of photodegradation of AFB1 was also proposed based on active species trapping experiments. This study illuminated the highly synergic adsorption and photocatalytic AFB1 removal efficiency without side effects from the modified PCL-g-C3N4/CQDs electrospun membranes, thereby offering a continual and green solution to AFB1 removal in practical application.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Enhancement of AFB1 Removal Efficiency via Adsorption/Photocatalysis Synergy Using Surface-Modified Electrospun PCL-g-C3N4/CQDs Membranes

et al. 2023

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“…[31] For the O 1s spectra (Figure 4c), there is no difference in the main peak situated at 532.2 eV, which is assigned to O in the C─O bond. [32] The Mo 3d energy spectrum (Figure 4d) indicates that two typical peaks at 230.1 and 234.8 eV, respectively, are corresponded to the Mo 3d 3/2 and Mo 3d 5/2 peaks of MO 6þ , indicating that Mo is successfully doped into Mo(0.005)-CN in the form of MO 6þ . [33] The photocatalytic performance is evaluated by N 2 fixation measurement.…”

Section: Resultsmentioning

confidence: 99%

Tailoring Surface Frustrated Lewis Pairs of Mo‐Doped Porous Ultrathin Carbon Nitride for Photocatalytic Nitrogen Fixation

Zhao

et al. 2022

Physica Status Solidi (a)

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Frustrated Lewis pairs (FLPs), new catalysts with pairs of spatially frustrated Lewis acid and Lewis bases within or between molecules, have aroused high attention due to their strong activation ability for inert small molecules such as CO2 and N2. Herein, Mo is introduced as a Lewis acid site to endow porous ultrathin carbon nitride (g‐C3N4) with FLPs‐like properties. The as‐prepared Mo‐doped porous ultrathin carbon nitride (Mo(0.005)–CN) exhibits N2 fixation rate as high as 479 μmol g−1 h−1, which is seven times more than that of bulk g‐C3N4. This is mainly attributed to the synergistic effect of two aspects. First, Mo(0.005)–CN has an excellent light utilization ability. Second, the charge transfer efficiency between the d orbital electrons of metallic Mo and the g‐C3N4 energy band is enhanced in Mo(0.005)–CN. This work paves the way for designing g‐C3N4 from the perspective of FLPs for high photocatalytic N2 fixation efficiency.

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“…The DLS results further confirmed the size heterogeneity of the LYZ/g-C 3 N 4 nanolayers (figure S5). It should be noted that, unlike the previous preparation of ultrathin g-C 3 N 4 materials with several or even single-layer nanostructures [26,54,55], this study focused on the assisted dispersion of g-C 3 N 4 by LYZ. Although the ultrathin structure of g-C 3 N 4 could be obtained by increasing the ultrasonic intensity, centrifugation speed or prolonging the time of ultrasonic and centrifugation.…”

Section: Lyz-assisted Liquid Phase Dispersion Of G-c 3 Nmentioning

confidence: 99%

Lysozyme-assisted ultrasonic exfoliation of graphitic carbon nitride into highly stable nanosheets with enhanced bactericidal capacity

Chen¹,

Shi²,

Zhang³

et al. 2022

2D Mater.

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Graphitic carbon nitride (g-C3N4) is a visible light-responsive photocatalytic material with important application prospects in many fields. However, the interaction between g-C3N4 monolayers makes it easy to aggregate and precipitate in aqueous solutions, and it is necessary to prepare stable g-C3N4 aqueous dispersions for their applications. Here we propose a facile, green, and low-cost method for the preparation of stable g-C3N4 dispersions by ultrasonicating g-C3N4 in lysozyme (LYZ) solution. The LYZ was adsorbed on the surface of g-C3N4 through non-covalent interactions such as electrostatic interaction, hydrogen bonding and π-cation interaction to prevent the aggregation of g-C3N4 nanolayers. The LYZ/g-C3N4 could quickly re-form a uniform aqueous dispersion solution after freeze-drying, and exhibit good stability. Further, the results of photocatalytic sterilization showed that the assisted dispersion of LYZ enhanced the bactericidal activity of g-C3N4 and exhibited promising application prospects in the field of biomedicine and water disinfection.

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In-situ one-step synthesis of porous monolayer carbon nitride nanosheets doped with carbon quantum dots for photocatalytic degradation of Meloxicam

Cited by 8 publications

References 40 publications

Enhancement of AFB1 Removal Efficiency via Adsorption/Photocatalysis Synergy Using Surface-Modified Electrospun PCL-g-C3N4/CQDs Membranes

Enhancement of AFB1 Removal Efficiency via Adsorption/Photocatalysis Synergy Using Surface-Modified Electrospun PCL-g-C3N4/CQDs Membranes

Tailoring Surface Frustrated Lewis Pairs of Mo‐Doped Porous Ultrathin Carbon Nitride for Photocatalytic Nitrogen Fixation

Lysozyme-assisted ultrasonic exfoliation of graphitic carbon nitride into highly stable nanosheets with enhanced bactericidal capacity

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