Enhancement photocatalytic activity of the graphite-like C 3 N 4 coated hollow pencil-like ZnO

Lv, Hualiang; Ji, Guangbin; Yang, Zhihong; Liu, Yousong; Zhang, Xingmiao; Liu, Wei; Zhang, Haiqian

doi:10.1016/j.jcis.2015.03.038

Cited by 99 publications

(34 citation statements)

References 21 publications

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“…where R ∞ is the reflection coefficient of the sample, and λ is the wavelength of absorption (nm). The band‐gaps of g‐C 3 N 4 and BiYO 3 , estimated from the intercept in the inset of Figure , were 2.96 eV and 2.58 eV, respectively, which was similar to the values reported in the literature ,. The large band‐gap of g‐C 3 N 4 limited its utility for responding to visible light, while the BiYO 3 exhibited good potency for a visible light reaction.…”

Section: Resultssupporting

confidence: 85%

g‐C₃N₄/BiYO₃ Composite for Photocatalytic Hydrogen Evolution

Dong

et al. 2018

ChemistrySelect

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g‐C3N4/BiYO3 composites were prepared by an electrostatic self‐assembly of g‐C3N4 and BiYO3 and were used as photocatalysts for photocatalytic hydrogen evolution. The UV‐vis DRS revealed that the band gaps of BiYO3 and g‐C3N4 were 2.58 eV and 2.96 eV, respectively, and the g‐C3N4/BiYO3 composites showed stronger visible light absorption than that of g‐C3N4 because the composite with BiYO3 served as a narrow bandgap catalyst. Electrochemical impedance spectroscopy (EIS) proved that the g‐C3N4/BiYO3 composites exhibited a better electronic transmission capacity and a larger photocurrent than that of g‐C3N4 or BiYO3 because the BiYO3 acted as an electron acceptor in the composites. The PL spectra showed that g‐C3N4 combined with BiYO3 inhibited the recombination of photo‐generated electron holes in g‐C3N4 and enhanced the photocatalytic activity for hydrogen evolution. Furthermore, the photocatalytic activities for hydrogen evolution with the g‐C3N4/BiYO3 composites were higher than those of the individual g‐C3N4 or BiYO3 alone due to the transfer of photogenerated electrons from the conduction band of g‐C3N4 to the conduction band of BiYO3 and the transfer of photogenerated holes from the valence band of BiYO3 to the valence band of g‐C3N4. The composite with a g‐C3N4/BiYO3 mass ratio of 2 showed an optimal hydrogen evolution rate of 37.6 μmol⋅h–1⋅gcat–1, which was 8.4‐ and 6.4‐fold higher than that of g‐C3N4 and BiYO3, respectively.

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Section: Resultssupporting

confidence: 85%

g‐C₃N₄/BiYO₃ Composite for Photocatalytic Hydrogen Evolution

Dong

et al. 2018

ChemistrySelect

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“…In order to solve the above-mentioned problems, firstly, ZnO can be synthesized with new nanostructures 4 , 11 to narrow energy bandgap or to offer large surface area. Nanostructures, including flower-like 4 , rod-shaped and belt-shaped 5 , sea urchin-shaped 11 and hollow pencil-like 25 , can have a significant promotion on the efficiency of photocatalysis activity. However, photocatalysts with nanoparticle are impractical to reuse.…”

Section: Introductionmentioning

confidence: 99%

Honeycomb-like ZnO Mesoporous Nanowall Arrays Modified with Ag Nanoparticles for Highly Efficient Photocatalytic Activity

Feng

Wang

Liao

et al. 2017

Sci Rep

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A new structure of honeycomb-like ZnO mesoporous nanowall arrays (MNWAs) with highly efficient photocatalytic activity was designed and successfully synthesized on Al foil by hydrothermal method. The nanowalls of ZnO-MNWAs have mesopores, which possess a large surface area. The visible light absorption of ZnO-MNWAs was efficiently stronger than ZnO nanowire, resulting in that the photocatalytic activity of ZnO-MNWAs, whose bandgap energy was 3.12 eV, was 5.97 times than that of ZnO nanowires in the degradation of methyl orange. Besides, Al foil acted as a good electron conductor which was beneficial to the separation of photo-induced electron-hole pairs. After modifying ZnO-MNWAs with a proper amount of Ag nanoparticles (NPs), photocatalytic activity could be further enhanced. The photocatalytic activity of ZnO-MNWAs with the optimal amount of Ag NPs was 9.08 times than that of ZnO nanowires and 1.52 times than that of pure ZnO-MNWAs.

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“…In order to overcome these drawbacks, several routes have been developed to further enhance the photocatalytic activity of g-C 3 N 4 , like doping some elements [11,12], loading some noble metal [13,14] or combining with heterogeneous semiconductors [15,16]. In particular, forming a heterojunction with g-C 3 N 4 , such as g-C 3 N 4 /SrTiO 3 [17], g-C 3 N 4 /SnO 2 [18], g-C 3 N 4 /ZnO [19], g-C 3 N 4 /TiO 2 [20], g-C 3 N 4 /CdS [21] and g-C 3 N 4 /BiOBr [22], is an effective strategy to enhance the photocatalytic activity. Unfortunately, most of them either could not remarkable extend the optical absorption, or ignore the influence of structure and morphology of g-C 3 N 4 to the photocatalytic properties.…”

Section: Introductionmentioning

confidence: 99%

Facile fabrication of novel porous graphitic carbon nitride/copper sulfide nanocomposites with enhanced visible light driven photocatalytic performance

Chen

et al. 2016

Journal of Colloid and Interface Science

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In this work, a novel organic-inorganic heterostructured photocatalyst: porous graphitic carbon nitride (g-C3N4) hybrid with copper sulfide (CuS) had been synthesized via a precipitation-deposition method at low temperature for the first time. UV-vis spectroscopy revealed the porous g-C3N4/CuS nanocomposites showed a strong and broad visible light absorption. Furthermore, the g-C3N4/CuS nanocomposites showed higher photocatalytic activity in the photodegradation of various organic dyes than that of pure g-C3N4 and CuS, and the selected sample of g-C3N4/CuS-2 exhibited the best photocatalytic activity under visible light. The good photocatalytic activity could be ascribed to the matching of the g-C3N4 and CuS band gap energies. Besides, photoluminescent spectra and photoelectrochemical measurements also proved that the CuS/g-C3N4 could greatly enhance the charge generation and suppress the charge recombination of photogenerated carriers. According to the experimental result, a possible photocatalytic mechanism has been proposed. Due to the high stability, the porous g-C3N4/CuS could be applied in the field of environmental remediation. Our work highlights that coupling semiconductors with well-matched band energies provides a facile way to improve the photocatalytic activity.

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Enhancement photocatalytic activity of the graphite-like C 3 N 4 coated hollow pencil-like ZnO

Cited by 99 publications

References 21 publications

g‐C₃N₄/BiYO₃ Composite for Photocatalytic Hydrogen Evolution

g‐C₃N₄/BiYO₃ Composite for Photocatalytic Hydrogen Evolution

Honeycomb-like ZnO Mesoporous Nanowall Arrays Modified with Ag Nanoparticles for Highly Efficient Photocatalytic Activity

Facile fabrication of novel porous graphitic carbon nitride/copper sulfide nanocomposites with enhanced visible light driven photocatalytic performance

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Enhancement photocatalytic activity of the graphite-like C 3 N 4 coated hollow pencil-like ZnO

Cited by 99 publications

References 21 publications

g‐C3N4/BiYO3 Composite for Photocatalytic Hydrogen Evolution

g‐C3N4/BiYO3 Composite for Photocatalytic Hydrogen Evolution

Honeycomb-like ZnO Mesoporous Nanowall Arrays Modified with Ag Nanoparticles for Highly Efficient Photocatalytic Activity

Facile fabrication of novel porous graphitic carbon nitride/copper sulfide nanocomposites with enhanced visible light driven photocatalytic performance

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g‐C₃N₄/BiYO₃ Composite for Photocatalytic Hydrogen Evolution

g‐C₃N₄/BiYO₃ Composite for Photocatalytic Hydrogen Evolution