Open AccessMicrostructures, Optical Properties and Degradation Efficiency of Nitrogen-doped Titanium Dioxide to Automobile Exhaust
Author(s) -
Zhihui Hu,
Wei Liu,
Tao Xu,
Xiaoyan Li
Publication year - 2020
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/735/1/012020
Subject(s) - photocatalysis , visible spectrum , materials science , dopant , anatase , titanium dioxide , doping , absorbance , photodegradation , photochemistry , analytical chemistry (journal) , optics , optoelectronics , chemistry , composite material , organic chemistry , physics , catalysis
To understand the influence of nitrogen (N) dopant on phase structure, morphology, optical property, photocatalytic degradation of TiO 2 to automobile exhaust (AE) under visible light irradiation, the N-doped TiO 2 was first prepared, and then X-ray diffraction (XRD), transmission electron microscopy (TEM), ultraviolet-visible light diffuse reflectance spectra (UV-vis DRS) and photocatalytic degradation tests were conducted. Results indicated that only anatase phase was found in both pure TiO 2 and N-doped TiO 2 , and the N doping improved the dispersity of TiO 2 . Also, the N doping increased the absorbance of TiO 2 under UV and visible light, respectively. An obvious red shift was observed on UV-Vis DRS of pure and N-doped TiO 2 samples, indicating that the spectral response range of TiO 2 was expanded to visible light region, and the utilization efficiency of solar irradiance was increased. The prepared N-doped TiO 2 nanoparticles with an N dopant content of 3.0% showed better optical properties. Finally, the N doping improved the photocatalytic activity of TiO 2 to AE in the visible light region. Furthermore, the N-doped TiO 2 presented lower degradation efficiency to CO than that to CO 2 under visible light radiation. Thus, it is found that the degradation efficiency of TiO 2 to AE can be increased by the N doping under visible light radiation.