Modulation of Sulfur Vacancies at ZnIn2S4-δ/g-C3N4 Heterojunction Interface for Successive C-H Secession in Photocatalytic Gaseous Formaldehyde Complete Oxidation

Xinwei Li; Yu Huang; Wingkei Ho; Shuwen Han; Pengge Wang; Shuncheng Lee; Zhuozhi Zhang

doi:10.1016/j.apcatb.2023.123048

Modulation of Sulfur Vacancies at ZnIn₂S_4-δ/g-C₃N₄ Heterojunction Interface for Successive C-H Secession in Photocatalytic Gaseous Formaldehyde Complete Oxidation

Xinwei Li, Yu Huang (Corresponding Author), Wingkei Ho, Shuwen Han, Pengge Wang, Shuncheng Lee (Corresponding Author), Zhuozhi Zhang

Department of Civil and Environmental Engineering

Research output: Journal article publication › Journal article › Academic research › peer-review

26 Citations (Scopus)

Abstract

Inspired by formaldehyde (HCHO) complete oxidation in atmospheric environments involving hydroxyl radicals (•OH) engaged in the breakage of the carbon-hydrogen (C-H) bond, S_v-ZnIn₂S_4-δ/g-C₃N₄ (S_v-ZIS/CN) composite decorated with sulfur vacancies (S-vacancies, S_v) was designed and fabricated for HCHO elimination at ambient environment. ZnIn₂S₄ (ZIS) in-situ grows on the g-C₃N₄ (CN) flats with an electrostatic attraction effect of cationic precursors, leading to the simultaneous construction of heterojunction interface and generation of S-vacancies. The internal electron field formed at the interface accelerate the photocarriers separation for the surface O₂ activation which has been profited form S-vacancies, thus promoting the generation of •OH radicals from •O₂-→H₂O₂→•OH route. The photocatalytic HCHO oxidation in the S_v-ZIS/5CN sample is kinetically favorable in the presence of abundant •OH engaged in the successive C-H bond scission route dioxymethylene (DOM)→formates(HCOO-)→CO₂ revealed by in-situ DRIFTS, which avoids the generation of undesirable CO and accumulation of intermediates.

Original language	English
Article number	123048
Journal	Applied Catalysis B: Environmental
Volume	338
DOIs	https://doi.org/10.1016/j.apcatb.2023.123048
Publication status	Published - 5 Dec 2023

Keywords

C-H secession
Formaldehyde
Hydroxyl radicals
Photocatalysis
ZnIn S /g-C N Heterojunction

ASJC Scopus subject areas

General Environmental Science
Process Chemistry and Technology
Catalysis

More information

10.1016/j.apcatb.2023.123048

Cite this

@article{9d8939e00c024758b3d266a2eb02a6c3,

title = "Modulation of Sulfur Vacancies at ZnIn2S4-δ/g-C3N4 Heterojunction Interface for Successive C-H Secession in Photocatalytic Gaseous Formaldehyde Complete Oxidation",

abstract = "Inspired by formaldehyde (HCHO) complete oxidation in atmospheric environments involving hydroxyl radicals (•OH) engaged in the breakage of the carbon-hydrogen (C-H) bond, Sv-ZnIn2S4-δ/g-C3N4 (Sv-ZIS/CN) composite decorated with sulfur vacancies (S-vacancies, Sv) was designed and fabricated for HCHO elimination at ambient environment. ZnIn2S4 (ZIS) in-situ grows on the g-C3N4 (CN) flats with an electrostatic attraction effect of cationic precursors, leading to the simultaneous construction of heterojunction interface and generation of S-vacancies. The internal electron field formed at the interface accelerate the photocarriers separation for the surface O2 activation which has been profited form S-vacancies, thus promoting the generation of •OH radicals from •O2-→H2O2→•OH route. The photocatalytic HCHO oxidation in the Sv-ZIS/5CN sample is kinetically favorable in the presence of abundant •OH engaged in the successive C-H bond scission route dioxymethylene (DOM)→formates(HCOO-)→CO2 revealed by in-situ DRIFTS, which avoids the generation of undesirable CO and accumulation of intermediates.",

keywords = "C-H secession, Formaldehyde, Hydroxyl radicals, Photocatalysis, ZnIn S /g-C N Heterojunction",

author = "Xinwei Li and Yu Huang and Wingkei Ho and Shuwen Han and Pengge Wang and Shuncheng Lee and Zhuozhi Zhang",

note = "Funding Information: This work was supported by the Green Tech Fund ( GTF202110151 ) of Hong Kong SAR Government, Theme-based Research Schemes ( T31-603/21-N and T24-504/17-N ) of Research Grants Council, Hong Kong. This work was also supported by the General Research Fund ( 18300920 ) of Research Grants Council, Hong Kong; Dean's Research Fund ( 04738 ), FLASS, EdUHK. This work was also partly supported by the National Key Research and Development Program of China ( 2016YFA0203000 ). Publisher Copyright: {\textcopyright} 2023 Elsevier B.V.",

year = "2023",

month = dec,

day = "5",

doi = "10.1016/j.apcatb.2023.123048",

language = "English",

volume = "338",

journal = "Applied Catalysis B: Environmental",

issn = "0926-3373",

publisher = "Elsevier B.V.",

}

Modulation of Sulfur Vacancies at ZnIn₂S_4-δ/g-C₃N₄ Heterojunction Interface for Successive C-H Secession in Photocatalytic Gaseous Formaldehyde Complete Oxidation. / Li, Xinwei; Huang, Yu (Corresponding Author); Ho, Wingkei et al.
In: Applied Catalysis B: Environmental, Vol. 338, 123048, 05.12.2023.

Research output: Journal article publication › Journal article › Academic research › peer-review

TY - JOUR

T1 - Modulation of Sulfur Vacancies at ZnIn2S4-δ/g-C3N4 Heterojunction Interface for Successive C-H Secession in Photocatalytic Gaseous Formaldehyde Complete Oxidation

AU - Li, Xinwei

AU - Huang, Yu

AU - Ho, Wingkei

AU - Han, Shuwen

AU - Wang, Pengge

AU - Lee, Shuncheng

AU - Zhang, Zhuozhi

N1 - Funding Information: This work was supported by the Green Tech Fund ( GTF202110151 ) of Hong Kong SAR Government, Theme-based Research Schemes ( T31-603/21-N and T24-504/17-N ) of Research Grants Council, Hong Kong. This work was also supported by the General Research Fund ( 18300920 ) of Research Grants Council, Hong Kong; Dean's Research Fund ( 04738 ), FLASS, EdUHK. This work was also partly supported by the National Key Research and Development Program of China ( 2016YFA0203000 ). Publisher Copyright: © 2023 Elsevier B.V.

PY - 2023/12/5

Y1 - 2023/12/5

N2 - Inspired by formaldehyde (HCHO) complete oxidation in atmospheric environments involving hydroxyl radicals (•OH) engaged in the breakage of the carbon-hydrogen (C-H) bond, Sv-ZnIn2S4-δ/g-C3N4 (Sv-ZIS/CN) composite decorated with sulfur vacancies (S-vacancies, Sv) was designed and fabricated for HCHO elimination at ambient environment. ZnIn2S4 (ZIS) in-situ grows on the g-C3N4 (CN) flats with an electrostatic attraction effect of cationic precursors, leading to the simultaneous construction of heterojunction interface and generation of S-vacancies. The internal electron field formed at the interface accelerate the photocarriers separation for the surface O2 activation which has been profited form S-vacancies, thus promoting the generation of •OH radicals from •O2-→H2O2→•OH route. The photocatalytic HCHO oxidation in the Sv-ZIS/5CN sample is kinetically favorable in the presence of abundant •OH engaged in the successive C-H bond scission route dioxymethylene (DOM)→formates(HCOO-)→CO2 revealed by in-situ DRIFTS, which avoids the generation of undesirable CO and accumulation of intermediates.

AB - Inspired by formaldehyde (HCHO) complete oxidation in atmospheric environments involving hydroxyl radicals (•OH) engaged in the breakage of the carbon-hydrogen (C-H) bond, Sv-ZnIn2S4-δ/g-C3N4 (Sv-ZIS/CN) composite decorated with sulfur vacancies (S-vacancies, Sv) was designed and fabricated for HCHO elimination at ambient environment. ZnIn2S4 (ZIS) in-situ grows on the g-C3N4 (CN) flats with an electrostatic attraction effect of cationic precursors, leading to the simultaneous construction of heterojunction interface and generation of S-vacancies. The internal electron field formed at the interface accelerate the photocarriers separation for the surface O2 activation which has been profited form S-vacancies, thus promoting the generation of •OH radicals from •O2-→H2O2→•OH route. The photocatalytic HCHO oxidation in the Sv-ZIS/5CN sample is kinetically favorable in the presence of abundant •OH engaged in the successive C-H bond scission route dioxymethylene (DOM)→formates(HCOO-)→CO2 revealed by in-situ DRIFTS, which avoids the generation of undesirable CO and accumulation of intermediates.

KW - C-H secession

KW - Formaldehyde

KW - Hydroxyl radicals

KW - Photocatalysis

KW - ZnIn S /g-C N Heterojunction

UR - http://www.scopus.com/inward/record.url?scp=85164325594&partnerID=8YFLogxK

U2 - 10.1016/j.apcatb.2023.123048

DO - 10.1016/j.apcatb.2023.123048

M3 - Journal article

SN - 0926-3373

VL - 338

JO - Applied Catalysis B: Environmental

JF - Applied Catalysis B: Environmental

M1 - 123048

ER -