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真空热处理对纳米TiO₂结构及可见光光催化活性的影响

Effect of heat treatment under vacuum on structure and visible-light photocatalytic activity of nano-TiO.

作者信息

Gao Zhengyuan, Sun Pengfei, Fang Yiliu, Li Chuanqiang, Yuan Xiaoya, Zheng Xuxu, Gao Jiacheng

机构信息

School of Mechatronics and Automotive Engineering, Chongqing Jiaotong University Chongqing China 400074.

School of Materials Science and Engineering, Chongqing Jiaotong University Chongqing China 400074

出版信息

RSC Adv. 2019 Oct 14;9(56):32691-32698. doi: 10.1039/c9ra03556g. eCollection 2019 Oct 10.

DOI:10.1039/c9ra03556g
PMID:35529763
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9073092/
Abstract

Nano-TiO is known as a photocatalyst with high catalytic activity. However, it should be emphasized that the bandgap of nano-TiO is wide, which limits its photocatalytic efficiency in response to visible light and thus hinders its potential application. Improving the photocatalytic activity of nano-TiO under visible light by the strategy of heat treatment under vacuum was investigated in this study. The structure and photocatalytic activity of nano-TiO before and after heat treatment under vacuum were compared and analyzed by XRD, TEM, HRTEM, XPS and UV-Vis-NIR, respectively. The results show that oxygen vacancies were introduced into the crystal structure of nano-TiO to change its inherent energy band structure. Particularly, the samples after heat treatment under vacuum exhibited high photocatalytic activity under visible light. In addition, the formation mechanism of non-stoichiometric compound TiO and the mechanism of oxygen vacancy defects to expand the wavelength of light that nano-TiO absorbs to the visible portion of the spectrum have also been addressed in this paper.

摘要

纳米二氧化钛是一种具有高催化活性的光催化剂。然而，需要强调的是，纳米二氧化钛的带隙较宽，这限制了其对可见光的光催化效率，从而阻碍了其潜在应用。本研究通过真空热处理策略研究了提高纳米二氧化钛在可见光下的光催化活性。分别通过XRD、TEM、HRTEM、XPS和UV-Vis-NIR对真空热处理前后纳米二氧化钛的结构和光催化活性进行了比较和分析。结果表明，氧空位被引入到纳米二氧化钛的晶体结构中，改变了其固有的能带结构。特别是，真空热处理后的样品在可见光下表现出高光催化活性。此外，本文还探讨了非化学计量化合物TiO的形成机制以及氧空位缺陷将纳米二氧化钛吸收光的波长扩展到光谱可见光部分的机制。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/826c/9073092/a4eb97c778cb/c9ra03556g-f9.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/826c/9073092/e4c44ebf4d52/c9ra03556g-f1.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/826c/9073092/ddcde1ac1f17/c9ra03556g-f5.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/826c/9073092/915462031365/c9ra03556g-f6.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/826c/9073092/fd25dca8cd5f/c9ra03556g-f7.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/826c/9073092/e9671291919d/c9ra03556g-f8.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/826c/9073092/a4eb97c778cb/c9ra03556g-f9.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/826c/9073092/e4c44ebf4d52/c9ra03556g-f1.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/826c/9073092/670cb7e4f156/c9ra03556g-f4.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/826c/9073092/ddcde1ac1f17/c9ra03556g-f5.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/826c/9073092/915462031365/c9ra03556g-f6.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/826c/9073092/fd25dca8cd5f/c9ra03556g-f7.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/826c/9073092/e9671291919d/c9ra03556g-f8.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/826c/9073092/a4eb97c778cb/c9ra03556g-f9.jpg

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