University of Oulu

Shiwen Zhu, Chengyu Yang, Feng Li, Taohai Li, Meng Zhang, Wei Cao, Improved photocatalytic Bi2WO6/BiOCl heterojunctions: One-step synthesis via an ionic-liquid assisted ultrasonic method and first-principles calculations, Molecular Catalysis, Volume 435, July 2017, Pages 33-48, ISSN 2468-8231, http://dx.doi.org/10.1016/j.mcat.2017.03.016. (http://www.sciencedirect.com/science/article/pii/S2468823117301700) Keywords: Bi2WO6/BiOCl; Heterojunctions; Ionic-liquid; Ultrasonic; Photocatalytic

Improved photocatalytic Bi₂WO₆/BiOCl heterojunctions : one-step synthesis via an ionic-liquid assisted ultrasonic method and first-principles calculations

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Author: Zhu, Shiwen1; Yang, Chengyu1; Li, Feng1;
Organizations: 1College of Chemistry, Key Lab of Environment Friendly Chemistry and Application in Ministry of Education, Xiangtan University, Xiangtan 411105, China
2Department of Physics, East China University of Science and Technology, Shanghai 200237, China
3Nano and Molecular Materials Research Unit, Faculty of Science, University of Oulu, P.O. Box 3000, FIN-90014, Finland
Format: article
Version: accepted version
Access: embargoed
Persistent link: http://urn.fi/urn:nbn:fi-fe201704045940
Language: English
Published: Elsevier, 2017
Publish Date: 2019-03-31
Description:

Abstract

Bi2WO6/BiOCl heterojunctions with high photocatalytic activity and photocurrent property were synthesized via an ionic-liquid assisted ultrasonic irradiation at room temperature. The ionic liquid 1-butyl-3-methylimidazolium chloride ([BMIM]Cl) was used as the Cl source. Modifications of heterojunction structures and properties were realized just by changing the amount of [BMIM]Cl. Photocatalytic activities of Bi2WO6/BiOCl heterojunctions enable fast degradations of 2,4-dinitrophenol solution (DNP), rhodamine B (RhB) and quinoline blue (QB) under visible light and sunlight irradiation. Through first-principles calculations, the Bi-O bonding was found as junction structures at the interface, leading to band intercalations between the two parts besides the interface. Efficient charge (hole) transfers to two sides of the tungstate and chloride were enabled through interface during photocatalytic processes, resulting in longer electron-hole separations, and enhanced catalytic activities under sunlight radiation. The mechanism is crosschecked with transient photocurrent results where the BiOCl-Bi2WO6 heterojunction possess higher photocurrent than pure Bi2WO6 or BiOCl, ascribed to inhibition of electron-hole recombination in the photo processes.

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Series: Molecular catalysis
ISSN: 2468-8231
ISSN-E: 2468-8231
ISSN-L: 2468-8231
Volume: 435
Pages: 33 - 48
DOI: 10.1016/j.mcat.2017.03.016
OADOI: https://oadoi.org/10.1016/j.mcat.2017.03.016
Type of Publication: A1 Journal article – refereed
Field of Science: 1172 Environmental sciences
114 Physical sciences
Subjects:
Funding: The authors acknowledge with thanks the financial support of the National Natural Science Foundation of China (21343008; 21601149) and Scientific Research Fund of Hunan Provincial Education Department, China (16B253), the Open Project Program of State Key Laboratory of Structural Chemistry, China (No. 20150018) and Hunan 2011 Collaborative Innovation Center of Chemical Engineering & Technology with Environmental Benignity and Effective Resource Utilization and the Oulu University Strategic Grant. T. Li acknowledges Oulu University Short-term International Research Visit grant during his stay in Finland.
Copyright information: © 2017 Elsevier B.V. All rights reserved. Published in this repository with the kind permission of the publisher.