TY - JOUR
T1 - UV and visible light-driven production of hydroxyl radicals by reduced forms of N, F, and P codoped titanium dioxide
AU - Abdullah, A. M.
AU - Gracia-Pinilla, Miguel
AU - Pillai, Suresh C.
AU - O’Shea, Kevin
N1 - Publisher Copyright:
© 2019 MDPI AG. All rights reserved.
PY - 2019/6/6
Y1 - 2019/6/6
N2 - 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.
AB - 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.
KW - Coumarin
KW - Hydroxyl radical
KW - Hydroxyl radical quantification
KW - Photocatalytic activity
KW - Visible light activated TiO2
KW - Visible light activated titanium dioxide
UR - http://www.scopus.com/inward/record.url?scp=85066759540&partnerID=8YFLogxK
U2 - 10.3390/molecules24112147
DO - 10.3390/molecules24112147
M3 - Article
C2 - 31174409
AN - SCOPUS:85066759540
SN - 1420-3049
VL - 24
JO - Molecules
JF - Molecules
IS - 11
M1 - 2147
ER -