Effect of heat treatment under vacuum on structure and visible-light photocatalytic activity of nano-TiO2

被引：7

作者：

Gao, Zhengyuan ^{[1
]}

Sun, Pengfei ^{[1
]}

Fang, Yiliu ^{[1
]}

Li, Chuanqiang ^{[2
]}

Yuan, Xiaoya ^{[2
]}

Zheng, Xuxu ^{[1
,2
]}

Gao, Jiacheng ^{[3
]}

机构：

[1] Chongqing Jiaotong Univ, Sch Mechatron & Automot Engn, Chongqing 400074, Peoples R China

[2] Chongqing Jiaotong Univ, Sch Mat Sci & Engn, Chongqing 400074, Peoples R China

[3] Chongqing Univ, Sch Mat Sci & Engn, Chongqing 400044, Peoples R China

来源：

RSC ADVANCES | 2019年 / 9卷 / 56期

关键词：

DECORATED TIO2 NANOWIRES; REDUCED RUTILE; NANOPARTICLES; WATER; DEGRADATION; MULTILAYERS; NANOTUBES; NANOSTRUCTURES; FABRICATION; POWDERS;

D O I：

10.1039/c9ra03556g

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Nano-TiO2 is known as a photocatalyst with high catalytic activity. However, it should be emphasized that the bandgap of nano-TiO2 is wide, which limits its photocatalytic efficiency in response to visible light and thus hinders its potential application. Improving the photocatalytic activity of nano-TiO2 under visible light by the strategy of heat treatment under vacuum was investigated in this study. The structure and photocatalytic activity of nano-TiO2 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-TiO2 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 TiO2-x and the mechanism of oxygen vacancy defects to expand the wavelength of light that nano-TiO2 absorbs to the visible portion of the spectrum have also been addressed in this paper.

引用

页码：32691 / 32698

页数：8

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