Fast flash frozen synthesis of holey few-layer g-C3N4 with high enhancement of photocatalytic reactive oxygen species evolution under visible light irradiation

Kang, Shifei; Zhang, Lu; Yin, Chaochuang; Li, Yaguang; Cui, Lifeng; Wang, Yangang

doi:10.1016/j.apcatb.2017.04.050

Cited by 105 publications

(40 citation statements)

References 49 publications

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“…To investigate the main ROS generated in the visible‐light‐driven photocatalytic process responsible for the degradation of pollutants, the experiments were carried out in the presence of 1,4‐benzoquinone (BQ, a scavenger for ·O 2 − ), KI (a scavenger for h + and ·OH radicals on the catalyst surface), and isopropanol (IPA, a scavenger for ·OH radicals in the solution), respectively . The results shown in Figure b indicate that the degradation efficiency of RhB significantly decreased from 98% to 16% in the presence of BQ after 15 min of reaction.…”

Section: Resultsmentioning

confidence: 99%

Black Phosphorus and Polymeric Carbon Nitride Heterostructure for Photoinduced Molecular Oxygen Activation

Zheng

et al. 2018

Adv Funct Materials

414

179

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Metal-free heterostructure photocatalysts composed of black phosphorus (BP) and polymeric carbon nitride (CN) are successfully synthesized via a one-step liquid exfoliation method assisted by sonication. The combination of BP with CN strengthens the visible-light harvesting ability, facilitates the charge separation in the photocatalytic process, and renders promoted activity of photoinduced molecular oxygen activation, such as superoxide radicals (·O 2 − ) evolution and H 2 O 2 production. This work highlights that coupling semiconductors with well-matched band levels provide a flexible route to enhance the performance of photocatalysts for producing reactive oxygen species, and gives ideas for the design of highly active and metal-free materials toward sustainable solar-to-chemical energy conversion and environmental remediation.

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Section: Resultsmentioning

confidence: 99%

Black Phosphorus and Polymeric Carbon Nitride Heterostructure for Photoinduced Molecular Oxygen Activation

Zheng

et al. 2018

Adv Funct Materials

414

179

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“…The introductiono fG QDs in the composite system prompts its conductivity,a sw ell as photocatalytic activity sites, leading to the improvemento fphotocatalytic performance. [35] To determine the chemical composition and the chemical status of BCN and P-TCN/GQDs-0.15 samples, XPS measurementsw ere conducted. For Figure 3a,i tw as observed that the www.chemcatchem.org high-resolution XPS spectra of C1si sd econvoluted into two peaks at 284.6 and 288.2 eV for both samples, which are assigned to graphitic carbon CÀCa nd sp 2 -hybridized carbon in the N-containing aromatic ring (NÀC=N), respectively.I ti s noted an additional new peak at 289.2 eV can be found in P-TCN/GQDs-0.15, which is due to the existence of OÀC=O bonds from the GQDs.…”

Section: Resultsmentioning

confidence: 99%

Graphene Quantum‐Dot‐Modified Hexagonal Tubular Carbon Nitride for Visible‐Light Photocatalytic Hydrogen Evolution

et al. 2018

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Graphene quantum dots were modified on hexagonal tubular carbon nitride to form a composite photocatalyst by freeze‐drying technology. With an optimum loading amount of 0.15 wt % GQDs, the composite photocatalyst exhibits an improved visible‐light photocatalytic performance for hydrogen evolution (112.1 μmol h−1) that is about 9 times higher than that of bulk carbon nitride. During the photocatalytic reaction, graphene quantum dots play a photosensitizer role and an electron reservoir, which can extend the visible‐light response of the photocatalyst, decrease its band gap, and improve the separation efficiency of photoinduced electron–hole pairs. The graphene quantum dots can also absorb the long‐wavelength light and then emit the shorter wavelength light based on its upper transfer luminescence properties, which also contribute to the utilization of visible light. This finding demonstrates that the graphene quantum‐dot modification is a promising method to improve visible‐light photocatalytic activities for traditional photocatalysts.

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“…The Nyquist plot data can be well-reproduced into solution-spreading resistance ( R s), charge-transfer resistance (Rct) (inset of Fig. 6a) in parallel with a constant phase-element (CPE) [54, 55]. Rct for a (SnNb 2 O 6 ), b (the mixed phases of SnNb 2 O 6 and Sn 2 Nb 2 O 7 ), and c (Sn 2 Nb 2 O 7 ) samples were 16.1, 35.5, and 41.7 KΩ, respectively.…”

Section: Resultsmentioning

confidence: 99%

Steering Charge Kinetics of Tin Niobate Photocatalysts: Key Roles of Phase Structure and Electronic Structure

et al. 2018

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Tin niobate photocatalysts with the phase structures of froodite (SnNb2O6) and pyrochlore (Sn2Nb2O7) were obtained by a facile solvothermal method in order to explore the impact of phase structure and electronic structure on the charge kinetics and photocatalytic performance. By employing tin niobate as a model compound, the effects of phase structure over electronic structure, photocatalytic activity toward methyl orange solution and hydrogen evolution were systematically investigated. It is found that the variation of phase structure from SnNb2O6 to Sn2Nb2O7 accompanied with modulation of particle size and band edge potentials that has great consequences on photocatalytic performance. In combination with the electrochemical impedance spectroscopy (EIS), transient photocurrent responses, transient absorption spectroscopy (TAS), and the analysis of the charge-carrier dynamics suggested that variation of electronic structure has great impacts on the charge separation and transfer rate of tin niobate photocatalysts and the subsequent photocatalytic performance. Moreover, the results of the X-ray photoelectron spectroscopy (XPS) indicated that the existent of Sn4+ species in Sn2Nb2O7 could result in a decrease in photocatalytic activity. Photocatalytic test demonstrated that the SnNb2O6 (froodite) catalyst possesses a higher photocatalytic activity toward MO degradation and H2 evolution compared with the sample of Sn2Nb2O7 (pyrochlore). On the basis of spin resonance measurement and trapping experiment, it is expected that photogenerated holes, O2−•, and OH• active species dominate the photodegradation of methyl orange.Electronic supplementary materialThe online version of this article (10.1186/s11671-018-2578-2) contains supplementary material, which is available to authorized users.

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Fast flash frozen synthesis of holey few-layer g-C3N4 with high enhancement of photocatalytic reactive oxygen species evolution under visible light irradiation

Cited by 105 publications

References 49 publications

Black Phosphorus and Polymeric Carbon Nitride Heterostructure for Photoinduced Molecular Oxygen Activation

Black Phosphorus and Polymeric Carbon Nitride Heterostructure for Photoinduced Molecular Oxygen Activation

Graphene Quantum‐Dot‐Modified Hexagonal Tubular Carbon Nitride for Visible‐Light Photocatalytic Hydrogen Evolution

Steering Charge Kinetics of Tin Niobate Photocatalysts: Key Roles of Phase Structure and Electronic Structure

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