Template-Free Synthesis of One-Dimensional g-C3N4 Chain Nanostructures for Efficient Photocatalytic Hydrogen Evolution

Zhang, Mingyi; Sun, Ye; Chang, Xin; Zhang, Peng

doi:10.3389/fchem.2021.652762

Cited by 6 publications

(6 citation statements)

References 51 publications

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“…In order to show the enhanced charge separation in the fabricated CuO/g-C 3 N 4 composite, PL spectra were obtained, as shown in Figure 9 . As can be observed, an emission peak of g-C 3 N 4 is located at 460 nm, which agrees with the previous results ( Liu and Ma, 2020 ; Zhang M. et al, 2021 ). The intensity of PL peak is high in case of g-C 3 N 4, which shows poor charge separation.…”

Section: Resultssupporting

confidence: 93%

Photocatalytic Removal of Antibiotics on g-C3N4 Using Amorphous CuO as Cocatalysts

et al. 2021

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Amorphous CuO is considered as an excellent cocatalyst, owing to its large surface area and superior conductivity compared with its crystalline counterpart. The current work demonstrates a facile method to prepare amorphous CuO, which is grown on the surface of graphitic carbon nitride (g-C3N4) and is then applied for the photocatalytic degradation of tetracycline hydrochloride. The prepared CuO/g-C3N4 composite shows higher photocatalytic activities compared with bare g-C3N4. Efficient charge transfer between g-C3N4 and CuO is confirmed by the photocurrent response spectra and photoluminescence spectra. This work provides a facile approach to prepare low-cost composites for the photocatalytic degradation of antibiotics to safeguard the environment.

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Section: Resultssupporting

confidence: 93%

Photocatalytic Removal of Antibiotics on g-C3N4 Using Amorphous CuO as Cocatalysts

et al. 2021

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“…The nitrogen adsorption–desorption isotherm was measured to evaluate the BET surface area, pore volume, and pore size distributions of the synthesized materials . The isotherms of CoNiWO 4 , Ph-gC 3 N 4 , and 20CoNiWO 4 /Ph-gC 3 N 4 heterocomposite are displayed in Figure .…”

Section: Resultsmentioning

confidence: 99%

“…The nitrogen adsorption–desorption isotherm was measured to evaluate the BET surface area, pore volume, and pore size distributions of the synthesized materials. 41 The isotherms of CoNiWO 4 , Ph-gC 3 N 4 , and 20CoNiWO 4 /Ph-gC 3 N 4 heterocomposite are displayed in Figure 5 . The Brunauer–Emmett–Teller (BET) surface areas of pure CoNiWO 4 and Ph-gC 3 N 4 have been determined to be 40.1 and 275.17 m 2 g –1 with pore volumes of 0.11 and 0.41 cm 3 g –1 , respectively.…”

Section: Resultsmentioning

confidence: 99%

Fabrication of Direct Z-Scheme CoNiWO₄/Ph-gC₃N₄ Heterocomposites: Enhanced Photodegradation of Bisphenol A and Anticancer Activity

Athar,

Rasool,

Muneer

et al. 2023

ACS Omega

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Photocatalysis is realized by the design of a visible-light-active catalyst with robust redox capacity and broad absorption. In this study, a series of novel Z-scheme CoNiWO4/Ph-gC3N4 photocatalysts are synthesized to improve their redox property and photocatalytic activity toward broad visible light absorption. An intimate stable heterojunction is made between cobalt–nickel tungstate (CoNiWO4) and phenyl-doped graphitic carbon nitride (Ph-gC3N4), and its physicochemical properties are studied. The bifunctional properties of all of the synthesized materials were assessed by studying the decomposition of bisphenol A (BPA) and methyl orange (MO) dye as model pollutants, followed by an evaluation of their anticancer activity on human lung cancer cell lines. The photocatalyst with 20 wt % CoNiWO4 heterocomposite showed an enhanced response toward the removal of cancerous cells. The synthesized pristine CoNiWO4 and Ph-gC3N4 exhibit well-matched band structures and, hence, make it easier to create a Z-scheme heterocomposite. This may increase the lifetime of photoinduced charge carriers with a high redox power, thereby improving their photocatalytic and anticancer activity. An extensive analysis of the mechanism demonstrates that hydroxyl radicals (•OH) and superoxide radical anions (•O2 –) are responsible for the degradation of organic compounds via Z-scheme charge transfer approach. These findings point toward a new route for creating effective Co–Ni tungstate-based direct Z-scheme photocatalysts for various redox processes, particularly the mineralization of resistant organic molecules.

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“…The morphological changes of g-C 3 N 4 photocatalysts before and after the H 2 +CO 2 plasma treatment are due to the shear effect of mixed plasma species of H (through the lines Hα, Hβ, and Hγ), CO, CO 2 , CO 2 + , O 2 , OH, O, C 2 , CO, and CO + . The multilayer nanobelt structure of H 2 +CO 2 -pCN reveals a large number of active edge sites, which can realize multiple visible-light reflection and scattering to improve energy utilization efficiency, and have a large interlayer distance, which is conducive to mass transfer [23,24].…”

Section: Morphologymentioning

confidence: 99%

H2+CO2 Synergistic Plasma Positioning Carboxyl Defects in g-C3N4 with Engineered Electronic Structure and Active Sites for Efficient Photocatalytic H2 Evolution

Wang

Zhang

et al. 2022

IJMS

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Defective functional-group-endowed polymer semiconductors, which have unique photoelectric properties and rapid carrier separation properties, are an emerging type of high-performance photocatalyst for various energy and environmental applications. However, traditional oxidation etching chemical methods struggle to introduce defects or produce special functional group structures gently and controllably, which limits the implementation and application of the defective functional group modification strategy. Here, with the surface carboxyl modification of graphitic carbon nitride (g-C3N4) photocatalyst as an example, we show for the first time the feasibility and precise modification potential of the non-thermal plasma method. In this method, the microwave plasma technique is employed to generate highly active plasma in a combined H2+CO2 gas environment. The plasma treatment allows for scalable production of high-quality defective carboxyl group-endowed g-C3N4 nanosheets with mesopores. The rapid H2+CO2 plasma immersion treatment can precisely tune the electronic and band structures of g-C3N4 nanosheets within 10 min. This conjoint approach also promotes charge-carrier separation and accelerates the photocatalyst-catalyzed H2 evolution rate from 1.68 mmol h−1g−1 (raw g-C3N4) to 8.53 mmol h−1g−1 (H2+CO2-pCN) under Xenon lamp irradiation. The apparent quantum yield (AQY) of the H2+CO2-pCN with the presence of 5 wt.% Pt cocatalyst is 4.14% at 450 nm. Combined with density functional theory calculations, we illustrate that the synergistic N vacancy generation and carboxyl species grafting modifies raw g-C3N4 materials by introducing ideal defective carboxyl groups into the framework of heptazine ring g-C3N4, leading to significantly optimized electronic structure and active sites for efficient photocatalytic H2 evolution. The 5.08-times enhancement in the photocatalytic H2 evolution over the as-developed catalysts reveal the potential and maneuverability of the non-thermal plasma method in positioning carboxyl defects and mesoporous morphology. This work presents new understanding about the defect engineering mechanism in g-C3N4 semiconductors, and thus paves the way for rational design of effective polymeric photocatalysts through advanced defective functional group engineering techniques evolving CO2 as the industrial carrier gas.

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Template-Free Synthesis of One-Dimensional g-C3N4 Chain Nanostructures for Efficient Photocatalytic Hydrogen Evolution

Cited by 6 publications

References 51 publications

Photocatalytic Removal of Antibiotics on g-C3N4 Using Amorphous CuO as Cocatalysts

Photocatalytic Removal of Antibiotics on g-C3N4 Using Amorphous CuO as Cocatalysts

Fabrication of Direct Z-Scheme CoNiWO₄/Ph-gC₃N₄ Heterocomposites: Enhanced Photodegradation of Bisphenol A and Anticancer Activity

H2+CO2 Synergistic Plasma Positioning Carboxyl Defects in g-C3N4 with Engineered Electronic Structure and Active Sites for Efficient Photocatalytic H2 Evolution

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Template-Free Synthesis of One-Dimensional g-C3N4 Chain Nanostructures for Efficient Photocatalytic Hydrogen Evolution

Cited by 6 publications

References 51 publications

Photocatalytic Removal of Antibiotics on g-C3N4 Using Amorphous CuO as Cocatalysts

Photocatalytic Removal of Antibiotics on g-C3N4 Using Amorphous CuO as Cocatalysts

Fabrication of Direct Z-Scheme CoNiWO4/Ph-gC3N4 Heterocomposites: Enhanced Photodegradation of Bisphenol A and Anticancer Activity

H2+CO2 Synergistic Plasma Positioning Carboxyl Defects in g-C3N4 with Engineered Electronic Structure and Active Sites for Efficient Photocatalytic H2 Evolution

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Fabrication of Direct Z-Scheme CoNiWO₄/Ph-gC₃N₄ Heterocomposites: Enhanced Photodegradation of Bisphenol A and Anticancer Activity