The Preparation of N-Doped Titanium Dioxide Films and Their Degradation of Organic Pollutants

Yanyan Dou; Yixuan Chang; Xuejun Duan; Leilei Fan; Bo Yang; Jingjing Lv

doi:10.3390/ijerph192315721

The Preparation of N-Doped Titanium Dioxide Films and Their Degradation of Organic Pollutants

Int J Environ Res Public Health. 2022 Nov 25;19(23):15721. doi: 10.3390/ijerph192315721.

Authors

Yanyan Dou¹, Yixuan Chang¹, Xuejun Duan¹, Leilei Fan², Bo Yang³, Jingjing Lv¹

Affiliations

¹ School of Energy and Environment, Zhongyuan University of Technology, Zhengzhou 450007, China.
² Department of Resources and Environment, Zunyi Normal College, Zunyi 563006, China.
³ People's Government of Donganggezhuang Town, Luanzhou City, Tangshan 063000, China.

Abstract

N-doped TiO₂ films supported by glass slides showed superior photocatalytic efficiency compared with naked TiO₂ powder due to them being easier to separate and especially being responsive to visible light. The films in this study were prepared via the sol-gel method using TBOT hydrolyzed in an ethanol solution and the nitrogen was provided by cabamide. The N-doped TiO₂ coatings were prepared via a dip-coating method on glass substrates (30 × 30 × 2 mm) and then annealed in air at 490 °C for 3 h. The samples were characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM) and UV-vis. The doping rate of N ranged from 0.1 to 0.9 (molar ratio), which caused redshifts to a longer wavelength as seen in the UV-vis analysis. The photocatalytic activity was investigated in terms of the degradation of phenol under both UV light and visible light over 4 h. Under UV light, the degradation rate of phenol ranged from 86% to 94% for all the samples because of the sufficient photon energy from the UV light. Meanwhile, under visible light, a peak appeared at the N-doping rate of 0.5, which had a degrading efficiency that reached 79.2%, and the lowest degradation rate was 32.9%. The SEM, XRD and UV-vis experimental results were consistent with each other.

Keywords: N-doped films; photocatalysis; titanium dioxide; visible light.

Publication types

Research Support, Non-U.S. Gov't

MeSH terms

Catalysis
Environmental Pollutants*
Light
Phenol*
Titanium / chemistry

Substances

titanium dioxide
Phenol
Environmental Pollutants
Titanium

Grants and funding

This work was supported by the Project of Guizhou Education, Science and Technology Project of Guizhou Province ([2016]1163), the Project of Guizhou Education Department([2016]047), the Training Program for Young Backbone Teachers in Colleges and Universities of Henan Province, (no. 2019GGJS140), the Zunyi Science and Technology Planning Project (no. ZSKH(2021)199), the 2021 Rural Revitalization Project of Zunyi Normal University (Special Scientific Research Fund of Guizhou Provincial Department of Education) (QJHKY [2021]017-9), the Zunyi Normal University Serving Local Industrial Revolution project (N0.ZSCXY [2021]04) and the “2021 academic new seedling cultivation and innovation exploration project” of Zunyi Normal University (no. ZSXM [2021]1-10).