Study on the Photocatalysis Mechanism of the Z-Scheme Cobalt Oxide Nanocubes/Carbon Nitride Nanosheets Heterojunction Photocatalyst with High Photocatalytic Performances

Zhao, Wei; Li, Jing; She, Tiantian; Ma, Sisi; Cheng, Zhipeng; Wang, Guoxiang; Zhao, Pusu; Wei, Wei; Xia, Dehua; Leung, Dennis Y.C.

doi:10.1016/j.jhazmat.2020.123839

Cited by 24 publications

(13 citation statements)

References 68 publications

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“…In contrast, the effective electron transfer in CdIn 2 S 4 /In 2 O 3 allows the production of large amounts of active species, including•OH, h þ , and•O 2 À , the holes accumulated by In 2 O 3 can also directly degrade organic pollutants. [48,[56][57][58] Organic pollutants such as acetone, phenol, and RhB react with free radicals to form final products, such as H 2 O and CO 2 . [59][60][61][62]…”

Section: Mechanism Explorationmentioning

confidence: 99%

Constructing an S‐Scheme Heterojunction between CdIn₂S₄ and an In₂O₃ Catalyst for Enhanced Photocatalytic Activity

Yuan

Zou

et al. 2022

Adv Energy and Sustain Res

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Herein, a novel CdIn2S4/In2O3 heterojunction photocatalyst, aiming to enhance photocatalytic performance for pollutant degradation, is fabricated by a self‐assembly process at low temperature. Ternary CdIn2S4 nanoparticles are uniformly deposited on the In2O3 nanoflowers, forming a step‐scheme (S‐scheme) hybrid heterostructure. As a result, the light absorption efficiency and charge separation efficiency of CdIn2S4/In2O3 are greatly improved. Among these fabricated samples are activated by visible light, and the degradation efficiency of gaseous acetone is as great as 92.3% over 10% CdIn2S4/In2O3 within 3 h, which is the highest value observed. Furthermore, the key intermediate compounds are elucidated using in situ Fourier transform infrared (FTIR) spectra, which strongly validate the hypothesized light degradation mechanism over CdIn2S4/In2O3. Correspondingly, a potential photocatalytic mechanism over CdIn2S4/In2O3 S‐scheme heterojunction is explored and discussed.

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Section: Mechanism Explorationmentioning

confidence: 99%

Constructing an S‐Scheme Heterojunction between CdIn₂S₄ and an In₂O₃ Catalyst for Enhanced Photocatalytic Activity

Yuan

Zou

et al. 2022

Adv Energy and Sustain Res

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“…Heavy metals and organic contaminants in modern wastewater have posed serious issues to human health and aquatic ecosystems. 1,2 Hexavalent chromium (Cr( vi )), a familiar heavy metal, derived from leather tanning, wood preservation, the steel fabrication industry, etc. , exhibits hypertoxicity, mutagenicity, carcinogenicity, and high mobility in wastewater.…”

Section: Introductionmentioning

confidence: 99%

“…Heavy metals and organic contaminants in modern wastewater have posed serious issues to human health and aquatic ecosystems. 1,2 Hexavalent chromium (CrĲVI)), a familiar heavy metal, derived from leather tanning, wood preservation, the steel fabrication industry, etc., exhibits hypertoxicity, mutagenicity, carcinogenicity, and high mobility in wastewater. 3,4 Trivalent chromium CrĲIII) is low toxicity, and easily eliminated as solids of chromic hydroxide, and thus CrĲVI) reduction into CrĲIII) would be a viable strategy towards removing CrĲVI).…”

Section: Introductionmentioning

confidence: 99%

Simultaneously enhanced photocatalytic cleanup of Cr(vi) and tetracycline via a ZnIn₂S₄ nanoflake-decorated 24-faceted concave MIL-88B(Fe) polyhedron S-scheme system

Huang

et al. 2022

Environ. Sci.: Nano

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“…These were contradictory descriptions [8] and thus, the direct Z-scheme heterojunction was considered as an ambiguous concept [24] because of the requirement of direct evidence about the carrier migration. Z-scheme heterojunction was speculated because its large chemical potential difference could meet the requirement of photocatalytic degradation [14,15,[25][26][27]. Some researchers affirmed Z-scheme heterojunction on the basis of the calculated work functions of semiconductors [25,26,28].…”

Section: Introductionmentioning

confidence: 99%

Direct observation of carrier migration in heterojunctions to discuss the p–n and direct Z-scheme heterojunctions

Yang¹,

Zhou²,

Chen³

et al. 2022

Nanotechnology

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Type II p-n heterojunction and direct Z-scheme heterojunction are identical staggered band alignments, but were reported ambiguously in many composite photocatalysts because their carriers migrate in opposite directions. In this research, metal oxides CuO, NiO and Co3O4-based heterojunctions with Na0.9Mg0.45Ti3.55O8 (NMTO) were synthesized via a simple hydrothermal method. The CuO/NMTO heterojunction was demonstrated as a direct Z-scheme heterojunction, whereas the NiO/NMTO and Co3O4/NMTO heterojunctions showed type II p-n band alignment, distinguished by the direct observation of carrier migration under light illumination, and confirmed by the X-ray photoelectron spectroscopy, Mott-Schottky measurements, ultraviolet photoelectron spectra and capture experiments. These all heterojunctions enjoyed better photocatalytic performance to degrade methylene blue and antibiotics (Enrofloxacin, Metronidazole and tetracycline) than the pure NMTO, attributed to their effective separation of the photoinduced electron-hole pairs owing to the staggered band alignment. Prominently, the NiO/NMTO and Co3O4/NMTO p-n heterojunctions exhibited superior degradation ability to the CuO/NMTO Z-scheme heterojunction. The initial relative Fermi position of two semiconductors is the prerequisite to determine whether the p-n heterojunction or direct Z-scheme heterojunction is built because the electrons diffuse from one semiconductor with a higher Fermi level to another with a lower Fermi level while the holes diffuse reversely until a united Fermi level when they combine. The built-in electric field at the heterojunction interface is determined by the difference in the initial Fermi levels or work functions of two semiconductors, regulating the separation ability of photogenerated electrons and holes to affect the photocatalytic performance. Thus, the high difference in the initial Fermi levels of semiconductors is crucial in the development of heterojunctions with staggered band alignment to obtain high performance in photocatalytic reactions.

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Study on the Photocatalysis Mechanism of the Z-Scheme Cobalt Oxide Nanocubes/Carbon Nitride Nanosheets Heterojunction Photocatalyst with High Photocatalytic Performances

Cited by 24 publications

References 68 publications

Constructing an S‐Scheme Heterojunction between CdIn₂S₄ and an In₂O₃ Catalyst for Enhanced Photocatalytic Activity

Constructing an S‐Scheme Heterojunction between CdIn₂S₄ and an In₂O₃ Catalyst for Enhanced Photocatalytic Activity

Simultaneously enhanced photocatalytic cleanup of Cr(vi) and tetracycline via a ZnIn₂S₄ nanoflake-decorated 24-faceted concave MIL-88B(Fe) polyhedron S-scheme system

Direct observation of carrier migration in heterojunctions to discuss the p–n and direct Z-scheme heterojunctions

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Study on the Photocatalysis Mechanism of the Z-Scheme Cobalt Oxide Nanocubes/Carbon Nitride Nanosheets Heterojunction Photocatalyst with High Photocatalytic Performances

Cited by 24 publications

References 68 publications

Constructing an S‐Scheme Heterojunction between CdIn2S4 and an In2O3 Catalyst for Enhanced Photocatalytic Activity

Constructing an S‐Scheme Heterojunction between CdIn2S4 and an In2O3 Catalyst for Enhanced Photocatalytic Activity

Simultaneously enhanced photocatalytic cleanup of Cr(vi) and tetracycline via a ZnIn2S4 nanoflake-decorated 24-faceted concave MIL-88B(Fe) polyhedron S-scheme system

Direct observation of carrier migration in heterojunctions to discuss the p–n and direct Z-scheme heterojunctions

Contact Info

Product

Resources

About

Constructing an S‐Scheme Heterojunction between CdIn₂S₄ and an In₂O₃ Catalyst for Enhanced Photocatalytic Activity

Constructing an S‐Scheme Heterojunction between CdIn₂S₄ and an In₂O₃ Catalyst for Enhanced Photocatalytic Activity

Simultaneously enhanced photocatalytic cleanup of Cr(vi) and tetracycline via a ZnIn₂S₄ nanoflake-decorated 24-faceted concave MIL-88B(Fe) polyhedron S-scheme system