University of Oulu

Zhuomin Qiang, Ximeng Liu, Feng Li, Taihai Li, Meng Zhang, Harishchandra Singh, Marko Huttula, Wei Cao, Iodine doped Z-scheme Bi2O2CO3/Bi2WO6 photocatalysts: Facile synthesis, efficient visible light photocatalysis, and photocatalytic mechanism, Chemical Engineering Journal, Volume 403, 2021, 126327, ISSN 1385-8947, https://doi.org/10.1016/j.cej.2020.126327

Iodine doped Z-scheme Bi₂O₂CO₃/Bi₂WO₆ photocatalysts : facile synthesis, efficient visible light photocatalysis, and photocatalytic mechanism

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Author: Qiang, Zhuomin1; Liu, Ximeng1; Li, Feng1,2;
Organizations: 1College of Chemistry, Key Lab of Environment Friendly Chemistry and Application in Ministry of Education, Xiangtan University, Xiangtan 411105, China
2Nano and Molecular Systems Research Unit, Faculty of Science, University of Oulu, P.O. Box 3000, FIN-90014, Finland
3Department of Physics, East China University of Science and Technology, Shanghai 200237, China
Format: article
Version: accepted version
Access: embargoed
Persistent link: http://urn.fi/urn:nbn:fi-fe2020092575870
Language: English
Published: Elsevier, 2021
Publish Date: 2021-07-19
Description:

Abstract

The Bi-based hierarchical multi-component photocatalytic system is an important player in energy and environmental catalysis due to its full-spectrum light absorption and stable separation of photo-generated charges. In this study, a novel family of iodine doped Bi₂O₂CO₃/Bi₂WO₆ heterojunctions was successfully developed by a facile ionic liquid assisted solvothermal method. A visible light photocatalytic H₂ production rate of 664.5 μmol g−1 h−1 (0.3I-Bi₂O₂CO₃/Bi₂WO₆ with 3% Pt) has been durably obtained, much higher than those of pristine and undoped counterparts. The photocatalysts are also capable for persistent pollutant and dye degradation. Through electrochemical and spectroscopic tests and density functional theory calculation, the enhanced photocatalytic activity is attributed to formation of the Z-scheme photocatalyst. Therein, the lowered and indirect bandgap and heterojunctional band alignment spontaneously benefit visible light harvesting, electron-hole pair separation, and proton reduction. Besides a facile synthesis for effective photocatalysis, the Z-scheme mechanism is hoped to facilitate the design and realization of similar systems for photocatalytic H₂ evolution and organic hazards decontamination.

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Series: Chemical engineering journal
ISSN: 1385-8947
ISSN-E: 1873-3212
ISSN-L: 1385-8947
Volume: 403
Article number: 126327
DOI: 10.1016/j.cej.2020.126327
OADOI: https://oadoi.org/10.1016/j.cej.2020.126327
Type of Publication: A1 Journal article – refereed
Field of Science: 215 Chemical engineering
Subjects:
Funding: The work was financially supported by the Academy of Finland (311934), Funds for the Central Universities (Nos. 222201714018) and China Scholarship Council.
Copyright information: © 2020 Elsevier B.V. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/.
  https://creativecommons.org/licenses/by-nc-nd/4.0/