TY - JOUR
T1 - Synthesis, characterization and photocatalytic evaluation of visible light activated C-doped TiO 2 nanoparticles
AU - Liu, Guanglong
AU - Han, Changseok
AU - Pelaez, Miguel
AU - Zhu, Duanwei
AU - Liao, Shuijiao
AU - Likodimos, Vlassis
AU - Ioannidis, Nikolaos
AU - Kontos, Athanassios G.
AU - Falaras, Polycarpos
AU - Dunlop, Patrick S.M.
AU - Byrne, J. Anthony
AU - Dionysiou, Dionysios D.
PY - 2012
Y1 - 2012
N2 - We have demonstrated heterogeneous photocatalytic degradation of microcystin-LR (MC-LR) by visible light activated carbon doped TiO 2 (C-TiO 2) nanoparticles, synthesized by a modified sol-gel route based on the self-assembly technique exploiting oleic acid as a pore directing agent and carbon source. The C-TiO 2 nanoparticles crystallize in anatase phase despite the low calcination temperature of 350°C and exhibit a highly porous structure that can be optimized by tuning the concentration of the oleic acid surfactant. The carbon modified nanomaterials exhibited enhanced absorption in the broad visible light region together with an apparent red shift in the optical absorption edge by 0.5eV (2.69eV), compared to the 3.18eV of reference anatase TiO 2. Carbon species were identified by x-ray photoelectron spectroscopy analysis through the formation of both Ti-C and C-O bonds, indicative of substitution of carbon for oxygen atoms and the formation of carbonates, respectively. Electron paramagnetic resonance spectroscopy revealed the formation of two carbon related paramagnetic centers in C-TiO 2, whose intensity was markedly enhanced under visible light illumination, pointing to the formation of localized states within the anatase band gap, following carbon doping. The photocatalytic activity of C-TiO 2 nanomaterials was evaluated for the degradation of MC-LR at pH 3.0 under visible light (λ>420nm) irradiation. The doped materials showed a higher MC-LR degradation rate than reference TiO 2, behavior that is attributed to the incorporation of carbon into the titania lattice.
AB - We have demonstrated heterogeneous photocatalytic degradation of microcystin-LR (MC-LR) by visible light activated carbon doped TiO 2 (C-TiO 2) nanoparticles, synthesized by a modified sol-gel route based on the self-assembly technique exploiting oleic acid as a pore directing agent and carbon source. The C-TiO 2 nanoparticles crystallize in anatase phase despite the low calcination temperature of 350°C and exhibit a highly porous structure that can be optimized by tuning the concentration of the oleic acid surfactant. The carbon modified nanomaterials exhibited enhanced absorption in the broad visible light region together with an apparent red shift in the optical absorption edge by 0.5eV (2.69eV), compared to the 3.18eV of reference anatase TiO 2. Carbon species were identified by x-ray photoelectron spectroscopy analysis through the formation of both Ti-C and C-O bonds, indicative of substitution of carbon for oxygen atoms and the formation of carbonates, respectively. Electron paramagnetic resonance spectroscopy revealed the formation of two carbon related paramagnetic centers in C-TiO 2, whose intensity was markedly enhanced under visible light illumination, pointing to the formation of localized states within the anatase band gap, following carbon doping. The photocatalytic activity of C-TiO 2 nanomaterials was evaluated for the degradation of MC-LR at pH 3.0 under visible light (λ>420nm) irradiation. The doped materials showed a higher MC-LR degradation rate than reference TiO 2, behavior that is attributed to the incorporation of carbon into the titania lattice.
UR - http://www.scopus.com/inward/record.url?scp=84863508952&partnerID=8YFLogxK
U2 - 10.1088/0957-4484/23/29/294003
DO - 10.1088/0957-4484/23/29/294003
M3 - Article
C2 - 22743554
AN - SCOPUS:84863508952
SN - 0957-4484
VL - 23
JO - Nanotechnology
JF - Nanotechnology
IS - 29
M1 - 294003
ER -