Photocatalytic mechanism of high-activity anatase TiO<sub>2</sub> with exposed (001) facets from molecular-atomic scale: HRTEM and Raman studies

doi:10.1007/s11706-017-0398-4

Front. Mater. Sci.

2017, Vol. 11

Issue (4) : 358-365 https://doi.org/10.1007/s11706-017-0398-4

RESEARCH ARTICLE

Photocatalytic mechanism of high-activity anatase TiO₂ with exposed (001) facets from molecular-atomic scale: HRTEM and Raman studies

Jun WU¹, Chentian SHI¹, Yupeng ZHANG^2,³(

), Qiang FU^1,⁴, Chunxu PAN^1,⁴(

)

¹. School of Physics and Technology, and MOE Key Laboratory of Artificial Micro- and Nano-structures, Wuhan University, Wuhan 430072, China
². College of Electronic Science and Technology, Shenzhen University, Shenzhen 518000, China
³. Department of Materials Science and Engineering, Monash University, Victoria 3800, Australia
⁴. Center for Electron Microscopy, Wuhan University, Wuhan 430072, China

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Abstract

Anatase TiO₂ with a variant percentage of exposed (001) facets was prepared under hydrothermal processes by adjusting the volume of HF, and the photocatalytic mechanism was studied from atomic-molecular scale by HRTEM and Raman spectroscopy. It was revealed that: 1) From HRTEM observations, the surface of original TiO₂ with exposed (001) facets was clean without impurity, and the crystal lattice was clear and completed; however, when mixed with methylene blue (MB) solution, there were many 1 nm molecular absorbed at the surface of TiO₂; after the photocatalytic experiment, MB molecules disappeared and the TiO₂ lattice image became fuzzy. 2) The broken path of the MB chemical bond was obtained by Raman spectroscopy, i.e., after the irradiation of the light, the vibrational mode of C−N−C disappeared due to the chemical bond breakage, and the groups containing C−N bond and carbon rings were gradually decomposed. Accordingly, we propose that the driving force for breaking the chemical bond and the disappearance of groups is from the surface lattice distortion of TiO₂ during photocatalyzation.

Keywords TiO₂ exposed (001) facets HRTEM Raman spectroscopy photocatalytic degradation mechanism

Corresponding Author(s): Yupeng ZHANG,Chunxu PAN

Online First Date: 31 October 2017 Issue Date: 29 November 2017

Cite this article:

Jun WU,Chentian SHI,Yupeng ZHANG, et al. Photocatalytic mechanism of high-activity anatase TiO₂ with exposed (001) facets from molecular-atomic scale: HRTEM and Raman studies[J]. Front. Mater. Sci., 2017, 11(4): 358-365.

URL:

https://academic.hep.com.cn/foms/EN/10.1007/s11706-017-0398-4
https://academic.hep.com.cn/foms/EN/Y2017/V11/I4/358

Fig.1 XRD patterns of the samples: (a) TF3, TF4, TF5, TF6, TF7 and TF8; (b) TF3-600, TF4-600, TF5-600, TF6-600, TF7-600 and TF8-600.

Fig.2 Raman spectra of the samples: (a) TF3, TF4, TF5, TF6, TF7 and TF8; (b) TF3-600, TF4-600, TF5-600, TF6-600, TF7-600 and TF8-600.

Fig.3 Sample TF3: (a) SEM image; (b) Raman spectrum.

Fig.4 Sample TF3-600: (a) SEM image; (b) Raman spectrum.

Fig.5 Images of samples: (a) TEM image of TF3; (b) HRTEM image of TF3; (c) HRTEM image of TMB0; (d) HRTEM image of TMB1.

Fig.6 Methylene blue: (a) molecule model and structure; (b) Raman spectrum.

Fig.7 Raman spectra of the samples TF3, TMB0 and TMB1.

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