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Morphology evolution and visible light driven photocatalysis study of Ti3+ self-doped TiO2−x nanocrystals

Published online by Cambridge University Press:  14 February 2017

Fang Li ,
Tiehu Han ,
Huigang Wang ,
Xuming Zheng ,
Junmin Wan  and
Bukuo Ni
Fang Li
Affiliation:
Department of Chemistry, Zhejiang Sci-Tech University, Hangzhou 310018, China
Tiehu Han
Affiliation:
Department of Chemistry, Zhejiang Sci-Tech University, Hangzhou 310018, China
Huigang Wang*
Affiliation:
Department of Chemistry and the Engineering Research Center for Eco-dyeing and Finishing of Textiles, Zhejiang Sci-Tech University, Hangzhou 310018, China
Xuming Zheng
Affiliation:
Department of Chemistry and the Engineering Research Center for Eco-dyeing and Finishing of Textiles, Zhejiang Sci-Tech University, Hangzhou 310018, China
Junmin Wan
Affiliation:
Engineering Research Center for Eco-dyeing and Finishing of Textiles, Zhejiang Sci-Tech University, Hangzhou 310018, China
Bukuo Ni
Affiliation:
Department of Chemistry, Texas A&M University–Commerce, Commerce, Texas 75429, USA
*
a) Address all correspondence to this author. e-mail: zdwhg@163.com, huigwang@uni-osnabrueck.de
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Abstract

One conceptually different approach has been developed to synthesize Ti3+ self-doped TiO2−x mesocrystals to narrow the band gap of TiO2. This simple and economical one-pot solvothermal method uses TiCl3 and tetrabutyltitanate (TBT) as a precursor and exhibits practical application. Different morphology including uniform spindle shape, tetragonal bipyramid, and capsule-like mesocrystals can be tailored easily by tuning the precursor ratio of TiCl3 to TBT. We have shown that our band gap engineered TiO2−x exhibits unique mesocrystal phase and owns substantial high visible light driven photocatalytic activities. Electron paramagnetic resonance (EPR) studies of this sample verified the presence of oxygen centered radicals, namely, hydroxyl (·OH) and superoxide radicals (O2 −·/·OOH). The catalysts have been characterized using transmission electron microscope, fluorescence spectra, Raman spectra, EPR, X-ray photoelectron spectroscopy, X-ray diffraction (XRD), Ultraviolet–visible absorption spectra, etc. It shows high catalytic stability. The findings of this work provide new insights for developing morphology tailored for visible light driven devices and other applications via controlled band gap engineering.

Keywords

Ti3+ self-doped TiO2−xmesocrystalsTiCl3–tetrabutyltitanate–acetic acidvisible light photocatalysismorphology tailored TiO2−x

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Type
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Journal of Materials Research , Volume 32 , Issue 8 , 28 April 2017 , pp. 1563 - 1572
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Copyright © Materials Research Society 2017 

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Footnotes

b)

These authors contributed equally to this work.

Contributing Editor: Xiaobo Chen

References

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