Superhydrophilicity-assisted preparation of transparent and visible light activated N-doped titania film

Abstract

A novel and environmental friendly method was developed to prepare transparent, uniform, crack-free and visible light activated nitrogen doped (N-doped) titania thin films without the use of organic Ti precursors and organic solvents. The N-doped titania films were prepared from heating aqueous peroxotitanate thin films deposited uniformly on superhydrophilic uncoated glass substrates. The pure glass substrates were superhydrophilic after being heated at 500 degrees C for 1 h. Nitrogen concentrations in the titania films were adjusted by changing the amount of ammonia solution. The optimal photocatalytic activity of the N-doped titania films was about 14 times higher than that of a commercial self-cleaning glass under the same visible light illumination. The current reported preparative technique is generally applicable for the preparation of other thin films.

N-doped Na2Ti6O13@TiO2 core–shell nanobelts with exposed {1 0 1} anatase facets and enhanced visible light photocatalytic performance

“…Apparently, the nitrogen dopant greatly promoted the light harvesting ability [56,57]. Since there is no red shift of the band edge and negligible absorption above 600 nm, the enhanced response to visible light should be attributed to the localized states near the top of VB of anatase TiO 2 introduced by nitrogen dopant, rather than the generation of oxygen vacancies [58].…”

Alcohol solvents evaporation-induced self-assembly synthesis of mesoporous TiO2−x−y C x N y nanoparticles toward visible-light driven photocatalytic activity

“…groups which imply that carbon and nitrogen were successfully incorporated into the structural lattice (Xu et al 2010). The signals in the range of 500-1,250 cm -1 are characteristic of the formation of O-Ti-O lattices (Chen et al 2005).…”

C-N-Codoped TiO2 Synthesis by using Peroxo Sol Gel Method for Photocatalytic Reduction of Cr(VI)

“…The precipitates was dried then calcined in air at 500ºC for 1 h. All samples were labelled as CNTO10, CNTO20 and CNTO25. Ammonia solution was replaced by NaOH solution for preparing un-doped TiO 2 and C-doped TiO 2 (CT) [15,17].…”

“…However, sol gel method always involves organic solvents and adding other expensive cost chemicals. Here, synthesis of C-N-codoped TiO 2 by peroxo sol gel was an effective way to solve above problems, became more efficient and environmental friendly due to using water only as the solvent [15]. Furthermore, a few publications have been published about photocatalytic activity reduction of Cr(VI) with multi-non-metal-codoped TiO 2 material under visible light irradiation.…”

“…Therefore, some methods have been developed to extend the band gap absorption to visible light region including doping or codoping with transition metal such as Cr, Fe, Mn, V, and non-metal atoms such as N, S, C. In the previous research C-Ncodoped TiO 2 photocatalytic activity was found more effective compared to TiO 2 . C-N- codoped has synergistic effect from dopant carbon and nitrogen in light absorption under visible light irradiation to enhance photocatalytic activity [1,[12][13][14][15][16].…”