scholarly journals UV and Visible Light-Driven Production of Hydroxyl Radicals by Reduced Forms of N, F, and P Codoped Titanium Dioxide

Molecules ◽  
2019 ◽  
Vol 24 (11) ◽  
pp. 2147 ◽  
Author(s):  
A. M. Abdullah ◽  
Miguel Á. Garcia-Pinilla ◽  
Suresh C. Pillai ◽  
Kevin O'Shea

The photocatalytic activities of reduced titanium dioxide (TiO2) materials have been investigated by measuring their ability to produce hydroxyl radicals under UV and visible light irradiation. Degussa P25 TiO2 was doped with nitrogen (N), fluorine (F), and/or phosphorus (P) and then subjected to surface modification employing a thermo-physicochemical process in the presence of reducing agent sodium borohydride (NaBH4). The reduced TiO2 materials were characterized by a number of X-ray, spectroscopic and imaging methods. Surface doping of TiO2 was employed to modulate the band gap energies into the visible wavelength region for better overlap with the solar spectrum. Hydroxyl radical generation, central to TiO2 photocatalytic water purification applications, was quantitated using coumarin as a trap under UV and visible light irradiation of the reduced TiO2 materials. At 350 nm irradiation, the yield of hydroxyl radicals generated by the reduced forms of TiO2 was nearly 90% of hydroxyl radicals generated by the Degussa P25 TiO2. Hydroxyl radical generation by these reduced forms of TiO2 was also observed under visible light irradiation (419 and 450 nm). These results demonstrated that simple surface modification of doped TiO2 can lead to visible light activity, which is important for more economical solar-driven applications of TiO2 photocatalysis.

2017 ◽  
Vol 53 (30) ◽  
pp. 4215-4218 ◽  
Author(s):  
Makoto Fukui ◽  
Atsuhiro Tanaka ◽  
Keiji Hashimoto ◽  
Hiroshi Kominami

An organically modified TiO2 photocatalyst chemoselectively converted benzaldehydes to the corresponding benzyl alcohols under visible light irradiation.


2016 ◽  
Vol 4 (16) ◽  
pp. 6116-6123 ◽  
Author(s):  
Sunao Kamimura ◽  
Masanobu Higashi ◽  
Ryu Abe ◽  
Teruhisa Ohno

A porous ZnRh2O4 electrode was fabricated by an electrophoretic deposition method on a fluorine-doped tin oxide substrate, and photoelectrochemical water splitting under visible light irradiation (λ > 420 nm) was performed.


2007 ◽  
Vol 111 (39) ◽  
pp. 14440-14447 ◽  
Author(s):  
Andrei A. Lisachenko ◽  
Ruslan V. Mikhailov ◽  
Lev L. Basov ◽  
Boris N. Shelimov ◽  
Michel Che

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