Highly Active TiO2N Photocatalysts Prepared by Treating TiO2 Precursors in NH3/Ethanol Fluid under Supercritical Conditions

Ag deposited N-TiO 2 composite nanoparticles were prepared via NH 3 plasma treatment. X-ray diffraction, UVvis spectroscopy, photoluminescence, and X-ray photoelectron spectroscopy were used to characterize the prepared TiO 2 samples. The plasma treatment did not change the phase composition and particle sizes of TiO 2 samples, but extended its absorption edges to the visible light region. The photocatalytic activities were tested in the degradation of an aqueous solution of a reactive dyestuff, methylene blue, under visible light. The photocatalytic activities of Ag deposited N-TiO 2 composite nanoparticles were much higher than Ag-TiO 2 , NTiO 2 , and P25. A possible mechanism for the photocatalysis was proposed.

Section: Methodsmentioning

confidence: 99%

A Convenient Method to Prepare Ag Deposited N-TiO₂Composite Nanoparticles via NH₃Plasma Treatment

Hu¹,

Li²,

Fan³

2012

“…This is probably attributed to change of chemical environment after N doping. 19 The electrons of N atoms may be partially transferred from N to Ti, due to the higher electronegativity of oxygen, leading to increased electron density on Ti atoms. The presence of nitrogen species is evidenced by the N1s peak in the XPS spectrum of N-TiO 2 (Fig.…”

Section: Resultsmentioning

confidence: 99%

Enhanced Visible Light Activity and Stability of TiO₂Nanopowder by co-doped with Mo and N

Hu¹,

Li²,

Fan³

2012

A visible light responsive N, Mo co-doped TiO 2 were prepared by sol-gel method. X-ray diffraction, TEM, N 2 adsorption, UV-vis spectroscopy, photoluminescence, and X-ray photoelectron spectroscopy were used to characterize the prepared TiO 2 samples. Doping restrained the phase transformation from anatase to rutile and reduced the particle sizes. The band gap was much narrowed after N, Mo co-doping. The photocatalytic activities were tested in the degradation of an aqueous solution of a reactive dyestuff, methylene blue, under visible light. The photocatalytic activities of doped TiO 2 were much higher than that of neat TiO 2 . The photocatalytic stability of N, Mo co-doped TiO 2 was much better than that of N doped TiO 2 .

“…Therefore, This shift is probably attributed to the change of chemical environment after N doping. 19 The electrons of N atoms may be partially transferred from N to Ti, due to the higher electronegativity of oxygen, leading to increased electron densities on Ti atoms. Besides, compared with N1-TiO 2 , more shift to lower binding energy was observed for N2-TiO 2 (Fig.…”

Section: +mentioning

confidence: 99%

The Comparison of Property and Visible Light Activity between Bulk and Surface Doped N-TiO₂Prepared by Sol-gel and N₂-plasma Treatment

Hu¹,

Li²,

Fan³

2012

A modified sol-gel method and N 2 -plasma treatment were used to prepare bulk and surface doped N-TiO 2 , respectively. XRD, TEM, UV-vis spectroscopy, N 2 adsorption, Elemental Analyzer, Photoluminescence, and XP spectra were used to characterize the prepared TiO 2 samples. The N doping did not change the phase composition and particle sizes of TiO 2 samples, but increased the visible light absorption. The photocatalytic activities were tested in the degradation of an aqueous solution of a reactive dyestuff, methylene blue, under visible light. The photocatalytic activity of surface doped N-TiO 2 prepared by N 2 -plasma was much higher than that of bulk doped N-TiO 2 prepared by sol-gel method. The possible mechanism for the photocatalysis was proposed.