Preparation, Photocatalytic Activity, and Mechanism of Nano-TiO₂ Co-Doped with Nitrogen and Iron (III)

Abstract

Nanoparticles of titanium dioxide co-doped with nitrogen and iron (III) were first prepared using the homogeneous precipitation-hydrothermal method. The structure and properties of the co-doped were studied by XRD, XPS, Raman, FL, and UV-diffuse reflectance spectra. By analyzing the structures and photocatalytic activities of the undoped and nitrogen and/or Fe 3+ -doped TiO 2 under ultraviolet and visible light irradiation, the probable mechanism of co-doped particles was investigated. It is presumed that the nitrogen and Fe 3+ ion doping induced the formation of new states closed to the valence band and conduction band, respectively. The co-operation of the nitrogen and Fe 3+ ion leads to the much narrowing of the band gap and greatly improves the photocatalytic activity in the visible light region. Meanwhile, the co-doping can also promote the separation of the photogenerated electrons and holes to accelerate the transmission of photocurrent carrier. The photocatalyst co-doped with nitrogen and 0.5% Fe 3+ shows the best photocatalytic activity, the degradation efficiencies of which were improved by 75% and 5% under visible and ultraviolet irradiation, respectively, compared with the pure titania.

A Convenient Method to Prepare Ag Deposited N-TiO2Composite Nanoparticles via NH3Plasma Treatment

“…Cong et al 26 reported that the peak in the range of 397-401 eV was the N1s peak when using the wet chemical method, whereas other methods should exhibit the N1s peak around 396 eV. Besides, according to the previous literatures about prepration of N doped TiO 2 using N 2 plasma treatment, 27 the peaks around 396 eV are attributed to substitution of crystallattice oxygen of TiO 2 to form Ti-N bond.…”

Enhanced Visible Light Activity and Stability of TiO2Nanopowder by co-doped with Mo and N

“…In addition, the different nitrogen source may also influence the characteristics of the nitrogen state. Cong et al 20 reported that the peak in the range of 397-401 eV was the N1s peak when using the wet chemical method. The N1s peaks of NTiO 2 and Mo-N-TiO 2 are all around 399 eV, which are attributed to the N1s electron binding energy of the N atom in the environment of O-Ti-N. 21 These binding energies are higher than the typical binding energy of 396.9 eV in TiN.…”

First Principles Study on the Electronic Structure and Optical Property of Nd-C Codoped Anatase TiO 2

“…Through years of development, the dopants change from metal ions [1][2][3][4][5][6][7] to nonmetal ions [8][9][10], and the doping method develop from single doping to codoping [11][12][13][14]. Carbon is one of the most adopted nonmetal dopants both in single doping and codoping.…”