Correlation of TiO2 photocatalytic activity and diffuse reflectance spectra

On the photocatalytic properties of elongated TiO2 nanoparticles for phenol degradation and Cr(VI) reduction

“…For TiO 2 -NF-H, however, its BET surface area is approximately identical to those of P25, TiO 2 -NF and TiO 2 -NF-400, suggesting that other structural factors of TiO 2 -NF-H account for the enhanced photocatalytic activity for phenol degradation. It is noteworthy that surface hydroxyl groups of TiO 2 are believed to be favorable for the generation of the highly active hydroxyl radical beneficial for oxidative degradation of organic compounds [38,39]. In contrast to other TiO 2 nanoparticles obtained using thermal post-treatment, TiO 2 nanoparticle prepared by the hydrothermal route is generally abundant in surface hydroxyl groups [20,40], which facilitates the generation of hydroxyl radical upon UV irradiation and eventually enhances phenol degradation.…”

Screening of factors influencing the photocatalytic activity of TiO2:Ln (Ln=La, Ce, Pr, Nd, Sm, Eu and Gd) in the degradation of dyes

“…The band gap energy (E g ) was estimated from the spectra in percent reflectance mode by means of the Kubelka-Munk function: F(R) = (1ÀR) 2 /2R, where R is the diffuse reflectance, through the corresponding Tauc plots: (F(R) Â E) 1/2 and E is the energy of absorbed light, by extrapolation of the straight line to the abscissa [21][22][23]. The visible light absorption (VLA) was calculated from the spectra of absorbance mode by numerical integration in the range of 400-700 nm [24,25]. All Table 1 It shows the experimental design with related factors and responses.…”

Synthesis, characterization, and photocatalytic activity of TiO2−xNx nanocatalyst

“…The new method avoided the laborious process compared to the traditional hydrolysis methods using inorganic titanium sources that need washing off residual SO 4 2− and Cl − [16,17]. The experiment results indicated that the TiO 2−x N x prepared here has highly visible light-induced photocatalytic activity for degradation of benzoic acid solutions.…”

“…They have also reported that the N-doped TiO 2 has photocatalytic activity under visible light during the photodegradation of acetaldehyde and methylene blue. Then, some researchers prepared the N-doped TiO 2 and obtained many results [14][15][16][17]. At present, the N-doped TiO 2 films or powders are prepared by: (1) sputtering TiO 2 targets for several hours in an N 2 /Ar gas mixture and then annealing in N 2 gas [13], (2) treating anatase TiO 2 powders in an NH 3 /Ar atmosphere to produce photocatalysts [14,15], and (3) a hydrolytic process using a TiCl 3 or Ti(SO 4 ) 2 solution and an ammonia solution [16,17].…”