Improved H2O2 photogeneration by KOH-doped g-C3N4 under visible light irradiation due to synergistic effect of N defects and K modification

Zhang, Hao; Jia, Luhan; Wu, Pan; Xu, Rui; He, Jilin

doi:10.1016/j.apsusc.2020.146584

Cited by 104 publications

(35 citation statements)

References 44 publications

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“…This demonstrated that TCQD modification of IOCN CV can increase both production and decomposition rates of H 2 O 2 but prefer production. 41 Overall, TC/CN is a high-performance photocatalyst for H 2 O 2 production with outstanding yield and long-term recyclability.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Carbon Vacancy Mediated Incorporation of Ti₃C₂ Quantum Dots in a 3D Inverse Opal g-C₃N₄ Schottky Junction Catalyst for Photocatalytic H₂O₂ Production

Lin

Zhang

Wang

et al. 2020

ACS Sustainable Chem. Eng.

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Photocatalytic H2O2 production is an environmentally friendly and sustainable production technique. Here, we fabricate the Ti3C2 quantum dot-modified defective inverse opal g-C3N4 (TC/CN) via a facile electrostatic self-assembly method. The resultant catalysts greatly facilitate the photocatalytic H2O2 production. The optimum H2O2 yield on TC/CN-20 reaches 560.7 μmol L–1 h–1, which is 9.3 times higher than that of bulk CN under visible light irradiation. This enhancement is attributed to the direction-induced bonding between carbon vacancies in g-C3N4 and TCQDs. The formation of a Schottky junction in the interface further realizes spatial separation of electron and holes, effectively avoiding the recombination of the charge carriers at defect sites. Therefore, this work not only constructs a high-performance photocatalyst for H2O2 production with outstanding yield and long-term recyclability but also develops a direction-induced bonding synthetic method and explores the functionary mechanism of defect sites in the Schottky junction for photocatalytic H2O2 production.

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Section: ■ Results and Discussionmentioning

confidence: 99%

Carbon Vacancy Mediated Incorporation of Ti₃C₂ Quantum Dots in a 3D Inverse Opal g-C₃N₄ Schottky Junction Catalyst for Photocatalytic H₂O₂ Production

Lin

Zhang

Wang

et al. 2020

ACS Sustainable Chem. Eng.

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“…4e) are assigned to the K 1/2p and K 3/2p orbitals of K, respectively, which are consistent with the binding energy of K-N and suggest the presence of K bridges in the gaps between the g-C 3 N 4 layers. 51 The interlayer charge flow can be expedited by the intercalated elemental K. 50 Fig. 4f shows the high resolution I 3d XPS spectrum of g-CN-KIO 3 with an I elemental content of 0.20%, which is lower than the content measured by EDS and ICP-MS due to slow surface evaporation.…”

Section: Significance Of the K/i/o Co-modification Over Controlsmentioning

confidence: 97%

Harmonious K–I–O co-modification of g-C₃N₄ for improved charge separation and photocatalysis

Kang

Zhang

et al. 2022

Inorg. Chem. Front.

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“…For example, the reduction of hexavalent chromium 6 , the degradation of benzene 7 , phenol, p-nitrophenol 8 , organic dye [9][10][11][12] , antibiotic 13,14 , and the photocatalytic antibacterial are typical representatives 15,16 . In addition, in the production of pollution-free new energy, photocatalysis is used to produce hydrogen [17][18][19][20][21][22] , oxygen, hydrogen peroxide 23,24 , CO2 photoreduction [25][26][27][28][29] , photocatalytic nitrogen fixation 30 , etc. Although photocatalysts have many advantages and are widely used, most of them have two fatal defects: low utilization of solar energy, and high recombination rate of photogenerated electron hole pairs [31][32][33] .…”

Section: Introductionmentioning

confidence: 99%

All Organic S-Scheme Heterojunction PDI-Ala/S-C<sub>3</sub>N<sub>4</sub> Photocatalyst with Enhanced Photocatalytic Performance

李喜宝¹,

刘积有²,

黄军同³

et al. 2020

Acta Physico Chimica Sinica

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Organic photocatalysts have attracted attention owing to their suitable redox band positions, low cost, high chemical stability, and good tunability of their framework and electronic structure. As a novel organic photocatalyst, PDI-Ala (N,N'-bis(propionic acid)-perylene-3,4,9,10tetracarboxylic diimide) has strong visible-light response, low valence band position, and strong oxidation ability. However, the low photogenerated charge transfer rate and high carrier recombination rate limit its application. Due to the aromatic heterocyclic structure of g-C3N4 and large delocalized π bond in the planar structure of PDI-Ala, g-C3N4 and PDI-Ala can be tightly combined through π-π interactions and N-C bond. The band structure of sulfur-doped g-C3N4 (S-C3N4) matched well with PDI-Ala than that with g-C3N4. The electron delocalization effect, internal electric field, and newly formed chemical bond jointly promote the separation and migration of photogenerated carriers between PDI-Ala and S-C3N4. To this end, a novel step-scheme (Sscheme) heterojunction photocatalyst comprising organic semiconductor PDI-Ala and S-C3N4 was prepared by an in situ self-assembly strategy. Meanwhile, PDI-Ala was self-assembled by transverse hydrogen bonding and longitudinal π-π stacking. The crystal structure, morphology, valency, optical properties, stability, and energy band structure of the PDI-Ala/S-C3N4 photocatalysts were systematically analyzed and studied by various characterization methods such as X-ray diffraction, transmission electron microscopy, energy dispersive X-ray spectrometry, X-ray photoelectron spectroscopy, ultraviolet visible diffuse reflectance spectroscopy, electrochemical impedance spectroscopy, and Mott-Schottky curve. The work functions and interface coupling characteristics were determined using density functional theory. The photocatalytic activities of the synthesized photocatalyst for H2O2 production and the degradation of tetracycline (TC) and p-nitrophenol (PNP) under visible-light irradiation are discussed. The PDI-Ala/S-C3N4 S-scheme heterojunction with band matching and tight interface bonding accelerates the intermolecular electron transfer and broadens the visible-light response range of the heterojunction. In addition, in the processes of the PDI-Ala/S-C3N4 photocatalytic degradation reaction, a variety of active species (h + , •O2 − , and H2O2) were produced and accumulated. Therefore, the PDI-Ala/S-C3N4 heterojunction exhibited enhanced photocatalytic performance in the degradation of TC, PNP, and H2O2 production. Under visible-light irradiation, the optimum 30%PDI-Ala/S-C3N4 removed 90% of TC within 90 min. In addition, 30%PDI-Ala/S-C3N4 displayed the highest H2O2 evolution rate of 28.3 μmol•h −1 •g −1 , which was 2.9 and 1.6 times higher than those of PDI-Ala and S-C3N4,

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Improved H2O2 photogeneration by KOH-doped g-C3N4 under visible light irradiation due to synergistic effect of N defects and K modification

Cited by 104 publications

References 44 publications

Carbon Vacancy Mediated Incorporation of Ti₃C₂ Quantum Dots in a 3D Inverse Opal g-C₃N₄ Schottky Junction Catalyst for Photocatalytic H₂O₂ Production

Carbon Vacancy Mediated Incorporation of Ti₃C₂ Quantum Dots in a 3D Inverse Opal g-C₃N₄ Schottky Junction Catalyst for Photocatalytic H₂O₂ Production

Harmonious K–I–O co-modification of g-C₃N₄ for improved charge separation and photocatalysis

All Organic S-Scheme Heterojunction PDI-Ala/S-C<sub>3</sub>N<sub>4</sub> Photocatalyst with Enhanced Photocatalytic Performance

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Improved H2O2 photogeneration by KOH-doped g-C3N4 under visible light irradiation due to synergistic effect of N defects and K modification

Cited by 104 publications

References 44 publications

Carbon Vacancy Mediated Incorporation of Ti3C2 Quantum Dots in a 3D Inverse Opal g-C3N4 Schottky Junction Catalyst for Photocatalytic H2O2 Production

Carbon Vacancy Mediated Incorporation of Ti3C2 Quantum Dots in a 3D Inverse Opal g-C3N4 Schottky Junction Catalyst for Photocatalytic H2O2 Production

Harmonious K–I–O co-modification of g-C3N4 for improved charge separation and photocatalysis

All Organic S-Scheme Heterojunction PDI-Ala/S-C<sub>3</sub>N<sub>4</sub> Photocatalyst with Enhanced Photocatalytic Performance

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Product

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Carbon Vacancy Mediated Incorporation of Ti₃C₂ Quantum Dots in a 3D Inverse Opal g-C₃N₄ Schottky Junction Catalyst for Photocatalytic H₂O₂ Production

Carbon Vacancy Mediated Incorporation of Ti₃C₂ Quantum Dots in a 3D Inverse Opal g-C₃N₄ Schottky Junction Catalyst for Photocatalytic H₂O₂ Production

Harmonious K–I–O co-modification of g-C₃N₄ for improved charge separation and photocatalysis