Oxygen Vacancy Mediated Band-Gap Engineering via B-Doping for Enhancing Z-Scheme A-TiO<sub>2</sub>/R-TiO<sub>2</sub> Heterojunction Photocatalytic Performance

Fabrication of Z-scheme heterojunction photocatalysts is an ideal strategy for solving environmental problems by providing inexhaustible solar energy. A direct Z-scheme anatase TiO<sub>2</sub>/rutile TiO<sub>2</sub> heterojunction photocatalyst was prepared using a facile B-d...

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Main Authors: Changqing Liu, Chenggang Xu, Wanting Wang, Long Chen, Xu Li, Yuanting Wu
Format: Article
Language:English
Published: MDPI AG 2023-02-01
Series:Nanomaterials
Subjects:
Online Access:https://www.mdpi.com/2079-4991/13/5/794
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author Changqing Liu
Chenggang Xu
Wanting Wang
Long Chen
Xu Li
Yuanting Wu
author_facet Changqing Liu
Chenggang Xu
Wanting Wang
Long Chen
Xu Li
Yuanting Wu
author_sort Changqing Liu
collection DOAJ
description Fabrication of Z-scheme heterojunction photocatalysts is an ideal strategy for solving environmental problems by providing inexhaustible solar energy. A direct Z-scheme anatase TiO<sub>2</sub>/rutile TiO<sub>2</sub> heterojunction photocatalyst was prepared using a facile B-doping strategy. The band structure and oxygen-vacancy content can be successfully tailored by controlling the amount of B-dopant. The photocatalytic performance was enhanced via the Z-scheme transfer path formed between the B doped anatase-TiO<sub>2</sub> and rutile-TiO<sub>2</sub>, optimized band structure with markedly positively shifted band potentials, and the synergistically-mediated oxygen vacancy contents. Moreover, the optimization study indicated that 10% B-doping with the R-TiO<sub>2</sub> to A-TiO<sub>2</sub> weight ratio of 0.04 could achieve the highest photocatalytic performance. This work may provide an effective approach to synthesize nonmetal-doped semiconductor photocatalysts with tunable-energy structures and promote the efficiency of charge separation.
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spelling doaj.art-c982b2ab5a204498ae47589d71a78ab62023-11-17T08:16:33ZengMDPI AGNanomaterials2079-49912023-02-0113579410.3390/nano13050794Oxygen Vacancy Mediated Band-Gap Engineering via B-Doping for Enhancing Z-Scheme A-TiO<sub>2</sub>/R-TiO<sub>2</sub> Heterojunction Photocatalytic PerformanceChangqing Liu0Chenggang Xu1Wanting Wang2Long Chen3Xu Li4Yuanting Wu5School of Material Science and Engineering, Shaanxi Key Laboratory of Green Preparation and Functionalization for Inorganic Materials, Shaanxi University of Science and Technology, Xi’an 710021, ChinaSchool of Material Science and Engineering, Shaanxi Key Laboratory of Green Preparation and Functionalization for Inorganic Materials, Shaanxi University of Science and Technology, Xi’an 710021, ChinaSchool of Material Science and Engineering, Shaanxi Key Laboratory of Green Preparation and Functionalization for Inorganic Materials, Shaanxi University of Science and Technology, Xi’an 710021, ChinaSchool of Material Science and Engineering, Shaanxi Key Laboratory of Green Preparation and Functionalization for Inorganic Materials, Shaanxi University of Science and Technology, Xi’an 710021, ChinaSchool of Material Science and Engineering, Shaanxi Key Laboratory of Green Preparation and Functionalization for Inorganic Materials, Shaanxi University of Science and Technology, Xi’an 710021, ChinaSchool of Material Science and Engineering, Shaanxi Key Laboratory of Green Preparation and Functionalization for Inorganic Materials, Shaanxi University of Science and Technology, Xi’an 710021, ChinaFabrication of Z-scheme heterojunction photocatalysts is an ideal strategy for solving environmental problems by providing inexhaustible solar energy. A direct Z-scheme anatase TiO<sub>2</sub>/rutile TiO<sub>2</sub> heterojunction photocatalyst was prepared using a facile B-doping strategy. The band structure and oxygen-vacancy content can be successfully tailored by controlling the amount of B-dopant. The photocatalytic performance was enhanced via the Z-scheme transfer path formed between the B doped anatase-TiO<sub>2</sub> and rutile-TiO<sub>2</sub>, optimized band structure with markedly positively shifted band potentials, and the synergistically-mediated oxygen vacancy contents. Moreover, the optimization study indicated that 10% B-doping with the R-TiO<sub>2</sub> to A-TiO<sub>2</sub> weight ratio of 0.04 could achieve the highest photocatalytic performance. This work may provide an effective approach to synthesize nonmetal-doped semiconductor photocatalysts with tunable-energy structures and promote the efficiency of charge separation.https://www.mdpi.com/2079-4991/13/5/794Z-scheme heterojunctionanatase TiO<sub>2</sub>/rutile TiO<sub>2</sub>band structureoxygen vacancy
spellingShingle Changqing Liu
Chenggang Xu
Wanting Wang
Long Chen
Xu Li
Yuanting Wu
Oxygen Vacancy Mediated Band-Gap Engineering via B-Doping for Enhancing Z-Scheme A-TiO<sub>2</sub>/R-TiO<sub>2</sub> Heterojunction Photocatalytic Performance
Nanomaterials
Z-scheme heterojunction
anatase TiO<sub>2</sub>/rutile TiO<sub>2</sub>
band structure
oxygen vacancy
title Oxygen Vacancy Mediated Band-Gap Engineering via B-Doping for Enhancing Z-Scheme A-TiO<sub>2</sub>/R-TiO<sub>2</sub> Heterojunction Photocatalytic Performance
title_full Oxygen Vacancy Mediated Band-Gap Engineering via B-Doping for Enhancing Z-Scheme A-TiO<sub>2</sub>/R-TiO<sub>2</sub> Heterojunction Photocatalytic Performance
title_fullStr Oxygen Vacancy Mediated Band-Gap Engineering via B-Doping for Enhancing Z-Scheme A-TiO<sub>2</sub>/R-TiO<sub>2</sub> Heterojunction Photocatalytic Performance
title_full_unstemmed Oxygen Vacancy Mediated Band-Gap Engineering via B-Doping for Enhancing Z-Scheme A-TiO<sub>2</sub>/R-TiO<sub>2</sub> Heterojunction Photocatalytic Performance
title_short Oxygen Vacancy Mediated Band-Gap Engineering via B-Doping for Enhancing Z-Scheme A-TiO<sub>2</sub>/R-TiO<sub>2</sub> Heterojunction Photocatalytic Performance
title_sort oxygen vacancy mediated band gap engineering via b doping for enhancing z scheme a tio sub 2 sub r tio sub 2 sub heterojunction photocatalytic performance
topic Z-scheme heterojunction
anatase TiO<sub>2</sub>/rutile TiO<sub>2</sub>
band structure
oxygen vacancy
url https://www.mdpi.com/2079-4991/13/5/794
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