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Fabrication of black TiO2/TiO2 homojunction for enhanced photocatalytic degradation

  • Zhiming Miao
  • Guanlong Wang
  • Lujie Li
  • Cong Wang
  • Xiufang ZhangEmail author
Chemical routes to materials
  • 9 Downloads

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.

Notes

Acknowledgements

We thank the financial supported from the Natural Science Foundation of China (No. 21577008) and the Natural Science Foundation of China (No. 21878031).

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

Supplementary material

10853_2019_3900_MOESM1_ESM.docx (1.9 mb)
Supplementary material 1 (DOCX 1921 kb)

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© Springer Science+Business Media, LLC, part of Springer Nature 2019

Authors and Affiliations

  1. 1.School of Light Industry and Chemical EngineeringDalian Polytechnic UniversityDalianChina

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