The Synergistic Effect of Nitrogen Dopant and Calcination Temperature on the Visible-Light-Induced Photoactivity of N-Doped TiO₂

Abstract

The synergistic effect of nitrogen content and calcinations temperature on the N-doped TiO2catalysts prepared by sol-gel method was investigated. The phase and structure, chemical state, optical properties, and surface area/pore distribution of N-doped TiO2were characterized using X-ray diffraction spectrometer, high-resolution transmission electron microscope, X-ray photoelectron spectroscopy, UV-vis diffusion reflectance spectroscopy, and Brunauer-Emmett-Teller specific surface area. Finding showed that the photocatalytic activity of N-doped TiO2was greatly enhanced compared to pure TiO2under visible irradiation. N dopants could retard the transformation from anatase to rutile phase. Namely, N-doping effect is attributed to the anatase phase stabilization. The results showed nitrogen atoms were incorporated into the interstitial positions of the TiO2lattice. Ethylene was used to evaluate the photocatalytic activity of samples under visible-light illumination. The results suggested good anatase crystallization, smaller particle size, and larger surface are beneficial for photocatalytic activity of N-doped TiO2. The N-doped TiO2catalyst prepared with ammonia to titanium isopropoxide molar ratio of 2.0 and calcinated at 400°C showed the best photocatalytic ability.

N-doped TiO2 Synthesised via Microwave Induced Photocatalytic on RR4 dye Removal under LED Light Irradiation

“…However, a few reported on N 1s peak above 400 eV assigned as chemisorbed nitrogen, NH 3 adsorbed on the surface TiO 2 and trapped N 2 gas (Sathish et al 2007;Yates et al 2006) but, many works have agreed and pointed out that the binding energy at 400 eV and above is assigned as interstitial N-O species (Hu et al 2012;Lin et al 2013;Zhu et al 2010). Peak at 404.8 eV of N 1s represented as surface adsorbed nitrogen species which is the nitrogen species bound to various surface oxygen site such as NO, NO 2 or NO X (Etacheri et al 2012).…”

Facile Synthesis and Characterization of N‐Doped TiO2 Photocatalyst and Its Visible‐Light Activity for Photo‐Oxidation of Ethylene

“…However, none of them gave satisfactory results due to their thermally instability and increased carrier trapping [8]. Relatively, the doping of anion on TiO 2 such as nitrogen and carbon element doped and codoped has considerable effect on increasing its photocatalytic activity [9][10][11][12][13][14], in which, the nitrogen seems to be the most effective dopant due to its similar size to oxygen and metastable defect complex, as well as small ionization energy [15], and N-doped TiO 2 (N-TiO 2 ) has an advantage on photocatalytic activity [16,17]. Hence, literatures focused on discussing the structure of N-TiO 2 using the X-ray photoelectron spectroscopy (XPS), electron spin resonance, or Xray absorption near edge structure.…”

Nitrogen-Doped Titanium Dioxide Mixed with Calcium Peroxide and Methylcellulose for Dental Bleaching under Visible Light Activation

“…To address the challenges imposed by the harmful UV light, a visible light-activating photocatalyst titanium dioxide was recently introduced. The feasibility of TiO 2 can be attributed to its nontoxicity, low price, and photostability [22]. Titanium dioxide (TiO 2 ), in its crude form, is a well-known photocatalytic material activated by UV light but can be modified to achieve photo response at visible light.…”