Boosting charge separation and broadening NIR light response over defected WO3 quantum dots coupled g-C3N4 nanosheets for photocatalytic degrading antibiotics

Huang, Jianjun; Wang, Binsong; Hao, Zhengjia; Zhou, Zerun; Qu, Yang

doi:10.1016/j.cej.2021.129109

Cited by 68 publications

(24 citation statements)

References 63 publications

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“…To better understand the transfer of the electrons between WO 3 and CN semiconductors, their work functions (WFs) and the corresponding Fermi levels were determined by ultraviolet photoelectron spectroscopy using HeI emission ( h ν = 21.2 eV) as a light source (Supporting Information, Figure S18). The relationship between the incident photon energy ( h ν) and the secondary edge position ( E SE ) is expressed by WF = h ν – E SE . , The WFs were found to be 4.1 and 5.1 eV for CN and WO 3 , respectively, which were consistent with another study . Hence, electrons transfer from the CB of CN to that in WO 3 , and concurrently, a built-in electric field is formed between them.…”

Section: Resultssupporting

confidence: 84%

Unmasking the Role of an Amorphous/Amorphous Interface and a Crystalline/Amorphous Interface in the Transition of Charge Carriers on the CN/SiO₂/WO₃ Photocatalyst

Jourshabani

Lee

2021

ACS Appl. Mater. Interfaces

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Making heterojunctions between semiamorphous carbon nitride (CN) and other well-matched semiconductors (or even insulators) can solve many photocatalytic problems such as the recombination of charge carriers. However, many researchers encounter intrinsic problems including the lack of detailed information on contact boundaries in their heterojunctions, particularly in the amorphous/amorphous interface. In addition, the roles of contact boundaries in the photocatalytic mechanisms of many heterojunctions are still obscure. This study synthesized a novel CN/SiO2/WO3 photocatalyst having two different contact features by constructing an amorphous/amorphous (CN/SiO2) interface and a crystalline/amorphous (WO3/CN) interface to provide deep insights into heterojunction interfaces. SiO2 plays an exceptional role as a major component in the separation and migration of charge carriers. It not only modifies the texture but also transfers electrons. Surprisingly, the amorphous/amorphous interface shows an unpredicted capability for decreasing the recombination of electron–hole pairs. Based on capturing experiments and photoluminescence investigations, the amorphous/amorphous interface is unprecedently present in the production of hydroxyl radicals, while the crystalline/amorphous interface gives more superoxide radicals. This work provides a platform that opens a new perspective on the selection of mutual photocatalysts. It extends boundaries of conventional heterojunctions.

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Section: Resultssupporting

confidence: 84%

Unmasking the Role of an Amorphous/Amorphous Interface and a Crystalline/Amorphous Interface in the Transition of Charge Carriers on the CN/SiO₂/WO₃ Photocatalyst

Jourshabani

Lee

2021

ACS Appl. Mater. Interfaces

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“…As displayed in Figure 6 b, the obvious DMPO-·O 2 − signals were discovered in T−ZIS and the DMPO-·O 2 − signals could hardly be detected in Sov−BWO. The inexistence of·O 2 − (O 2 /OH, −0.33 V vs NHE) over Sov−BWO was due to the inadequate E CB potential [ 46 ]. Meanwhile, after constructing of Sov−50BWO/T−ZIS hybrid, the intensity of DMPO-·O 2 − was significantly higher than that of T−ZIS.…”

Section: Resultsmentioning

confidence: 99%

Investigation of the Kinetics and Reaction Mechanism for Photodegradation Tetracycline Antibiotics over Sulfur-Doped Bi2WO6-x/ZnIn2S4 Direct Z-Scheme Heterojunction

Jiang

Huang

Wei³

et al. 2021

Nanomaterials

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The rational design of direct Z-scheme heterostructural photocatalysts using solar energy is promising for energy conversion and environmental remediation, which depends on the precise regulation of redox active sites, rapid spatial separation and transport of photoexcited charge and a broad visible light response. The Bi2WO6 materials have been paid more and more attention because of their unique photochemical properties. In this study, S2− doped Bi2WO6-x coupled with twin crystal ZnIn2S4 nanosheets (Sov−BWO/T−ZIS) were prepared as an efficient photocatalyst by a simple hydrothermal method for the removal of tetracycline hydrochloride (TCH). Multiple methods (XRD, TEM, XPS, EPR, UV vis DRS, PL etc.) were employed to systematically investigate the morphology, structure, composition and photochemical properties of the as-prepared samples. The XRD spectrum indicated that the S2− ions were successfully doped into the Sov−BWO component. XPS spectra and photoelectrochemical analysis proved that S2− served as electronic bridge and promoted captured electrons of surface oxygen vacancies transfer to the valence band of T−ZIS. Through both experimental and in situ electron paramagnetic resonance (in situ EPR) characterizations, a defined direct Z-scheme heterojunction in S-BWO/T−ZIS was confirmed. The improved photocatalytic capability of S-BWO/T−ZIS results ascribed that broadened wavelength range of light absorption, rapid separation and interfacial transport of photoexcited charge, precisely regulated redox centers by optimizing the interfacial transport mode. Particularly, the Sov−50BWO/T−ZIS Z-scheme heterojunction exhibited the highest photodegradation rate was 95% under visible light irradiation. Moreover, this heterojunction exhibited a robust adsorption and degradation capacity, providing a promising photocatalyst for an organic pollutant synergistic removal strategy.

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“…Polarization curves are implied to investigate the surface hydrogen evolution kinetics. [75,76] As seen in Figure 8c, the overpotential of GDY, CQDs, and 30% GDY/CQDs samples are −0.33, −0.29, and −0.21 V, respectively. The reduced overpotential for 30% GDY/CQDs reveals that the lower recombination rate of photoexciton and the fast migration efficiency of charges demonstrate superior photocatalytic performance.…”

Section: Electrochemical Characterizationmentioning

confidence: 89%

Rational Construction of Z‐Scheme Charge Transfer Based on 2D Graphdiyne (g‐C_nH₂_n₋₂) Coupling with Amorphous Co₃O₄ Quantum Dots for Efficient Photocatalytic Hydrogen Generation

Xiang

Hao

Guo

et al. 2022

Adv Materials Inter

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A novel Co3O4 quantum dots (CQDs)/2D graphdiyne (GDY) Z‐scheme heterojunction is fabricated by cross‐coupling reaction and electrostatic self‐assembly methods. GDY with the features of 2D porous structures has not only conducted the adsorption of dye molecules but also CQDs is facile to be anchored on the surface. Additionally, the construction of Z‐scheme heterojunction is conductive to conquer the shortcomings of easy agglomeration and poor dispersion for CQDs. The maximum photocatalytic hydrogen generation rate of 1500.85 µmol h−1 g−1 is gained for 30% GDY/CQDs and display an apparent quantum efficiency of 1.37% at 475 nm, which is roughly 11‐fold and 2.8‐fold higher than the pristine GDY and CQDs, respectively. The superior photocatalytic H2 production performance would be put down to the intense synergy of Z‐scheme heterostructure and the size effect of CQDs. They dramatically enhance the separation and transport of photogenerated charge carriers. Besides, the Z‐scheme charge transfer mechanism is further verified through the results of photoluminescence. This work offers new insight into the design of GDY‐based Z‐scheme heterojunction for photocatalysis.

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Boosting charge separation and broadening NIR light response over defected WO3 quantum dots coupled g-C3N4 nanosheets for photocatalytic degrading antibiotics

Cited by 68 publications

References 63 publications

Unmasking the Role of an Amorphous/Amorphous Interface and a Crystalline/Amorphous Interface in the Transition of Charge Carriers on the CN/SiO₂/WO₃ Photocatalyst

Unmasking the Role of an Amorphous/Amorphous Interface and a Crystalline/Amorphous Interface in the Transition of Charge Carriers on the CN/SiO₂/WO₃ Photocatalyst

Investigation of the Kinetics and Reaction Mechanism for Photodegradation Tetracycline Antibiotics over Sulfur-Doped Bi2WO6-x/ZnIn2S4 Direct Z-Scheme Heterojunction

Rational Construction of Z‐Scheme Charge Transfer Based on 2D Graphdiyne (g‐C_nH₂_n₋₂) Coupling with Amorphous Co₃O₄ Quantum Dots for Efficient Photocatalytic Hydrogen Generation

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Boosting charge separation and broadening NIR light response over defected WO3 quantum dots coupled g-C3N4 nanosheets for photocatalytic degrading antibiotics

Cited by 68 publications

References 63 publications

Unmasking the Role of an Amorphous/Amorphous Interface and a Crystalline/Amorphous Interface in the Transition of Charge Carriers on the CN/SiO2/WO3 Photocatalyst

Unmasking the Role of an Amorphous/Amorphous Interface and a Crystalline/Amorphous Interface in the Transition of Charge Carriers on the CN/SiO2/WO3 Photocatalyst

Investigation of the Kinetics and Reaction Mechanism for Photodegradation Tetracycline Antibiotics over Sulfur-Doped Bi2WO6-x/ZnIn2S4 Direct Z-Scheme Heterojunction

Rational Construction of Z‐Scheme Charge Transfer Based on 2D Graphdiyne (g‐CnH2n−2) Coupling with Amorphous Co3O4 Quantum Dots for Efficient Photocatalytic Hydrogen Generation

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Unmasking the Role of an Amorphous/Amorphous Interface and a Crystalline/Amorphous Interface in the Transition of Charge Carriers on the CN/SiO₂/WO₃ Photocatalyst

Unmasking the Role of an Amorphous/Amorphous Interface and a Crystalline/Amorphous Interface in the Transition of Charge Carriers on the CN/SiO₂/WO₃ Photocatalyst

Rational Construction of Z‐Scheme Charge Transfer Based on 2D Graphdiyne (g‐C_nH₂_n₋₂) Coupling with Amorphous Co₃O₄ Quantum Dots for Efficient Photocatalytic Hydrogen Generation