Preparation of highly visible-light active N-doped TiO2 photocatalyst

Abstract

A series of N-doped anatase TiO 2 samples have been prepared using a solvothermal method in an organic amine/ethanol-water reaction system. The effects of different starting N : Ti atomic ratios on the catalysts structure, surface property and catalytic activity have been investigated. The photocatalytic activity and stability of the N-doped TiO 2 samples were evaluated through using the decomposition of Methylene blue (MB) and Methyl orange (MO) as model reaction under visible light irradiation. Characterization results show that the nitrogen dopant has a significant effect on the crystallite size and optical absorption of TiO 2 . It was found that the N-doped TiO 2 catalysts have enhanced absorption in the visible light region, and exhibit higher activity for photocatalytic degradation of model dyes (e.g. MB and MO). The catalyst with the highest performance was the one prepared using N : Ti molar ratio of 1.0. Electron paramagnetic resonance (EPR) measurement suggests the materials contain Ti 3+ ions, with both the degree of N doping and oxygen vacancies make contributions to the visible light absorption of TON. The presence of superoxide radicals (Ȯ À ) and hydroxyl radicals (OH) on the surface of TON were found to be responsible for MB and MO solution decoloration under visible light. Based on the results of the present study, a visible light induced photocatalytic mechanism has been proposed for N-doped anatase TiO 2 .

Sequential Processes to Produce N-TiO2Films Through Rf Plasmas

“…It is remarkable that the E 1g vibration band, it is very intense and acute, similar conditions have been reported by other researchers [31], [28], [25]. In Table 1 shows that after the doping process with nitrogen, the N-TiO 2 film has a vibrational band right shifted, indicating that the particle size has been increased, this effect has been observed by others authors [32], [33]. Later is consistent with the results of XRD.…”

Preparation and Characterization of Mn/N Co-Doped TiO2 Loaded on Wood-Based Activated Carbon Fiber and Its Visible Light Photodegradation

“…To be noted that the range of 397.5 to 400.3 eV was corresponding to Ti-N-O. After the peak splitting of N 1s (Figure 4), the peaks also appeared in the regions of ď397.5 eV (N-Ti-N) and ě404 eV ascribing to NO x [33,34]. This further confirmed that N of the Mn/Ti-N-WACF samples substituted some of the O atoms in the TiO 2 lattice.…”

Hybridising nitrogen doped titania with kaolinite: A feasible catalyst for a semi-continuous photo-degradation reactor system

“…For the N 1s, the high binding energy of around 406 eV can be assigned to nitrogen species bound to various surface oxygen sites (NO or NO 2 molecules) [20]. The N 1s peak at 399-400 eV can be attributed to the nitrogen in the form of Ti-N-O linkage [21].…”