Novel rugby-like g-C3N4/BiVO4 core/shell Z-scheme composites prepared via low-temperature hydrothermal method for enhanced photocatalytic performance

Li, Zhilin; Jin, Chongyue; Wang, Min; Kang, Jin Kyu; Wu, Zengmin; Yang, Daien; Zhu, Tong

doi:10.1016/j.seppur.2019.115937

Cited by 78 publications

(18 citation statements)

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“… 48 However, the energy potential of h VB + of g-C 3 N 4 (+1.87 eV) was not sufficiently positive to react with OH – to generate ·OH radicals (+1.99 V vs NHE). 49 Finally, the ·O 2 – and ·OH photodegraded MO into H 2 O and CO 2 . Throughout the above analysis, the overall electron transfer and degradation reactions and charge carrier transfers were described as follows …”

Section: Results and Discussionmentioning

confidence: 99%

“…Second, the electrons on CB of the g-C 3 N 4 were transferred to the surface of Ag nanoparticles rapidly, and these accumulated that electrons in the Ag nanoparticles could reduce O 2 to yield ·O 2 – (−0.046 V vs NHE) radicals, which produced additional hydroxyl radicals (·OH) . However, the energy potential of h VB + of g-C 3 N 4 (+1.87 eV) was not sufficiently positive to react with OH – to generate ·OH radicals (+1.99 V vs NHE) . Finally, the ·O 2 – and ·OH photodegraded MO into H 2 O and CO 2 .…”

Section: Results and Discussionmentioning

confidence: 99%

“…48 However, the energy potential of h VB + of g-C 3 N 4 (+1.87 eV) was not sufficiently positive to react with OH − to generate •OH radicals (+1.99 V vs NHE). 49 Finally, the • O 2…”

Section: Resultsmentioning

confidence: 99%

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Ag-Modified g-C₃N₄ Prepared by a One-Step Calcination Method for Enhanced Catalytic Efficiency and Stability

Liu

Yang

et al. 2020

ACS Omega

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Ag-decorated g-C 3 N 4 (denoted as Ag/CN- x ) was prepared by a one-step calcination method, and the influences of calcination time on structure, morphology, surface composition, photocatalytic performance, and catalytic reduction activity of the prepared Ag/CN- x samples were investigated. The tests showed that the Ag/CN-8 prepared through by calcination for 8 h exhibited the best photocatalytic degradation efficiency of methyl orange (98.7% within 2 h) and the best catalytic reduction property of 4-nitrophenol (100% within 70 s). Meanwhile, these Ag/CN- x samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), Brunauer–Emmett–Teller (BET), X-ray photoelectron spectroscopy (XPS), UV–vis diffuse reflectance spectra (DRS), photoluminescence (PL), photocurrent response, and electrochemical impedance spectroscopy (EIS) Nyquist plots. It was found that the Ag/CN-8 prepared through calcination for 8 h had a higher specific surface area, higher dispersibility of silver nanoparticles (Ag NPs), the widest range of visible light response, and the lowest photogenerated electron–hole recombination rate. The results of the trapping experiments indicated that a superoxide radical plays a major role. Moreover, a possible mechanism of photocatalytic degradation in methyl orange and catalytic reduction 4-nitrophenol was proposed.

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Section: Results and Discussionmentioning

confidence: 99%

Section: Results and Discussionmentioning

confidence: 99%

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Ag-Modified g-C₃N₄ Prepared by a One-Step Calcination Method for Enhanced Catalytic Efficiency and Stability

Liu

Yang

et al. 2020

ACS Omega

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“…Figure 4b,c presents the Bi 4f and V 2p spectra of the CPB-2 sample; the typical peaks of Bi 4f (Figure 4b) at 159.4 and 164.6 eV are attributed to Bi 4f 7/2 and Bi 4f 5/2 bands of Bi 3+ species. 32 For V 2p (Figure 4c), binding energies at around 516.6 and 517.8 eV are assigned to V 4+ and V 5+ in VO 4 3− (Figure 4c); the V 4+ can play the role of an electron sink to restrain the charges' recombination, which will be beneficial to improving the photocatalytic performance. 33 The O 1s spectrum is presented in Figure 4d; for BiVO 4 , the peaks centered at 529.8 and 531.1 eV are ascribed to the lattice oxygen (O 2− in the Bi−O band) and the oxygen in the surface hydroxyl species of the sample.…”

Section: ■ Experimental Sectionmentioning

confidence: 99%

Construction of a Switchable g-C₃N₄/BiVO₄ Heterojunction from the Z-Scheme to the Type II by Incorporation of Pyromellitic Diimide

Qin

Chen

et al. 2022

Crystal Growth & Design

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g-C 3 N 4 /BiVO 4 is considered to be a preeminent composite photocatalyst owing to its suitable band position, intrinsic Z-scheme heterostructure, and high photostability. However, its application is limited owing to the short lifetime of photoexcited charges and weak photooxidation capability. In this work, the g-C 3 N 4 structure is tailored using pyromellitic diimide (PI) then hybridized with BiVO 4 to construct the g-C 3 N 4 /PI/BiVO 4 (CPB) photocatalyst. The morphology analysis shows that coral-like nanorod BiVO 4 is coated on the stacked lamellar g-C 3 N 4 /PI surface. Addition of g-C 3 N 4 /PI enhances the solar efficiency as well as promotes interfacial charge separation and migration, thus lengthening the charge carriers' life span. Photocatalytic activity is detected via photooxidation of the organic dye methylene blue (MB) and phenolic antibiotics bisphenol A (BPA) and norfloxacin (NFC). A significantly boosted photocatalytic activity is achieved by the CPB photocatalyst, the CPB-2 photocatalyst with a 30% mass fraction of g-C 3 N 4 /PI displays the best visible-light catalytic activity, and 89.9% MB is mineralized within 100 min, which is significantly enhanced in composition with g-C 3 N 4 /BiVO 4 (74%) and mix(g-C 3 N 4 /PI, BiVO 4 ) (56%). An improved activity results in a higher light absorption capacity, a lower transfer resistance of electron−hole pairs, and a stronger photooxidation power. Importantly, the Z-scheme g-C 3 N 4 /BiVO 4 composite with an inherent built-in electric field (E) switches to a type-II heterojunction after incorporating PI with g-C 3 N 4 but without compromising the photocatalytic performance. The result may be due to the fact that the van der Waals force of BiVO 4 and g-C 3 N 4 is destroyed after incorporating PI into g-C 3 N 4 , giving rise to the disappearance of the built-in electric field. The study provides a paradigm for designing efficient photocatalysts by tailoring organic frameworks for specific photocatalytic reactions or photoreactions.

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“…It has been widely verified that the energy band of pristine g-C 3 N 4 and BiVO 4 are perfectly matched to construct heterojunction composites [18,19]. The application of g-C 3 N 4 /BiVO 4 heterojunction can effectively deal with high a recombination rate of photogenerated electron-hole pairs, and exhibits the excellent ability of separation and transfer of electronhole pairs [20,21].…”

Section: Introductionmentioning

confidence: 99%

Enhanced the Efficiency of Photocatalytic Degradation of Methylene Blue by Construction of Z-Scheme g-C3N4/BiVO4 Heterojunction

Zhang

Liu

et al. 2021

Coatings

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Both non-metallic g-C3N4 and BiVO4 are novel photocatalysts responsive to visible light, but their low charge separation efficiency restricts their inconspicuous photocatalytic activity. In this paper, direct Z-type g-C3N4/BiVO4 photocatalyst was constructed by calcination and hydrothermal for the degradation of methylene blue. The existence of g-C3N4/BiVO4 heterojunction was confirmed by the detailed study of its chemical structure and morphology by various characterization methods, such as X-ray diffraction (XRD), Scanning electron microscope (SEM), and X-ray photoelectron spectroscopy (XPS). The evaluation of photocatalytic performance showed that the MB degradation performance of 1.0-CN/BVO was significantly enhanced, which was 4.528 times and 2.387 times higher than pristine BiVO4 and g-C3N4, respectively, which was mainly due to the enhanced light capture ability and effective electron transfer in the photocatalytic reaction. The 1.0-CN/BVO composite exhibited extremely catalytic stability and recyclability.

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Novel rugby-like g-C3N4/BiVO4 core/shell Z-scheme composites prepared via low-temperature hydrothermal method for enhanced photocatalytic performance

Cited by 78 publications

References 50 publications

Ag-Modified g-C₃N₄ Prepared by a One-Step Calcination Method for Enhanced Catalytic Efficiency and Stability

Ag-Modified g-C₃N₄ Prepared by a One-Step Calcination Method for Enhanced Catalytic Efficiency and Stability

Construction of a Switchable g-C₃N₄/BiVO₄ Heterojunction from the Z-Scheme to the Type II by Incorporation of Pyromellitic Diimide

Enhanced the Efficiency of Photocatalytic Degradation of Methylene Blue by Construction of Z-Scheme g-C3N4/BiVO4 Heterojunction

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Novel rugby-like g-C3N4/BiVO4 core/shell Z-scheme composites prepared via low-temperature hydrothermal method for enhanced photocatalytic performance

Cited by 78 publications

References 50 publications

Ag-Modified g-C3N4 Prepared by a One-Step Calcination Method for Enhanced Catalytic Efficiency and Stability

Ag-Modified g-C3N4 Prepared by a One-Step Calcination Method for Enhanced Catalytic Efficiency and Stability

Construction of a Switchable g-C3N4/BiVO4 Heterojunction from the Z-Scheme to the Type II by Incorporation of Pyromellitic Diimide

Enhanced the Efficiency of Photocatalytic Degradation of Methylene Blue by Construction of Z-Scheme g-C3N4/BiVO4 Heterojunction

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Ag-Modified g-C₃N₄ Prepared by a One-Step Calcination Method for Enhanced Catalytic Efficiency and Stability

Ag-Modified g-C₃N₄ Prepared by a One-Step Calcination Method for Enhanced Catalytic Efficiency and Stability

Construction of a Switchable g-C₃N₄/BiVO₄ Heterojunction from the Z-Scheme to the Type II by Incorporation of Pyromellitic Diimide