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Journal of Materials Science
Published in: Journal of Materials Science 23/2019

13-08-2019 | Chemical routes to materials

Fabrication of black TiO2/TiO2 homojunction for enhanced photocatalytic degradation

Authors: Zhiming Miao, Guanlong Wang, Lujie Li, Cong Wang, Xiufang Zhang

Published in: Journal of Materials Science | Issue 23/2019

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Abstract

Photocatalysis is a promising technology for removing contaminant in water. However, the rapid recombination of photogenerated charge carriers limits the performance of photocatalysis in water treatment. Here, a novel light response B/W-TiO2 homojunction catalyst based on the black TiO2 (B-TiO2) and TiO2 (W-TiO2) was successfully synthesized by a facile hydrothermal method. The mass ratio of B-TiO2 to W-TiO2 was tuned to study its effect on homojunction formation and photocatalytic performance. Beneficial from the band difference between B-TiO2 and W-TiO2, the conduction band (CB) electrons of W-TiO2 can migrate to the CB of B-TiO2 and the valence band (VB) holes of B-TiO2 transfer to the VB of W-TiO2, hence effectively promoting the separation of photogenerated charge carriers. The formation of homojunction can dramatically improve the photocatalytic ability of B/W-TiO2; the kinetic constant of rhodamine B degradation of B/W-TiO2 with optimal mass ratio is nearly 3.9 and 5.2 times higher than that of B-TiO2 and W-TiO2, respectively. Moreover, the superoxide radical (O 2 ·− ) and hydroxyl radicals (·OH) species play a crucial role in the photodegradation process. The enhancement of photocatalytic activity is attributed to the construction of B/W-TiO2 homojunction, which is beneficial to improve the separation efficiency of photogenerated electron–holes.
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Appendix
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Metadata
Title
Fabrication of black TiO2/TiO2 homojunction for enhanced photocatalytic degradation
Authors
Zhiming Miao
Guanlong Wang
Lujie Li
Cong Wang
Xiufang Zhang
Publication date
13-08-2019
Publisher
Springer US
Published in
Journal of Materials Science / Issue 23/2019
Print ISSN: 0022-2461
Electronic ISSN: 1573-4803
DOI
https://doi.org/10.1007/s10853-019-03900-2

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