Effect of heat treatment under vacuum on structure and visible-light photocatalytic activity of nano-TiO₂

Abstract

Nano-TiO2 is known as a photocatalyst with high catalytic activity.

Fabrication and Application of Photocatalytic Composites and Water Treatment Facility Based on 3D Printing Technology

“…Nano-TiO 2 was modified with the silane coupling agent KH-570, as well as the samples before and after modification were analyzed by infrared spectrometer, as shown in Figure 3 . Among them, the wide absorption band of 3339.06 cm −1 is the -OH absorption band on the surface of TiO 2 , and the 500–800 cm −1 is the vibration absorption peak of the framework of Ti-O-Ti, this is in line with the reports in the literature [ 29 ]. Relative to the unmodified TiO 2 , the absorption peak at 2924.67 cm −1 on the infrared spectrum of TiO 2 modified by the silane coupling agent KH-570 is the stretching vibration peak of –CH 3 and –CH 2 [ 30 ].…”

Observation of Room-Temperature Ferromagnetism Induced by High-Pressure Hydrogenation of Anatase TiO2

“…For the compounds of Ti in different valence states, the values of binding energy of Ti 2p 3/2 are different. The lower the chemical valence of Ti ions, the smaller the binding energy of corresponding Ti 2p 3/2 lines. , The TiO 2 -H2-P40 sample shows a third component located around 460 eV, highlighted in magenta (inset Figure b), which corresponds to Ti 4+ in a tetrahedral environment because of high hydrogen pressure that produces a disordered surface . Now, with the increase of the hydrogenation time (10 h) to 20 atm, as shown in Figure c, no appreciable shift in the position of the signal Ti 4+ 2p 3/2 is observed, agreeing with the observations of Yan et al…”

“…55,62,64 XPS Spectroscopy. 68,69 The TiO 2 -H2-P40 sample shows a third component located around 460 eV, highlighted in magenta (inset Figure 9b), which corresponds to Ti 4+ in a tetrahedral environment because of high hydrogen pressure that produces a disordered surface. 70 Now, with the increase of the hydrogenation time (10 h) to 20 atm, as shown in Figure 9c, no appreciable shift in the position of the signal Ti 4+ 2p 3/2 is observed, agreeing with the observations of Yan et al 41 The O 1s spectra are displayed in Figure 9d−f.…”