TY - JOUR
T1 - In situ XANES studies of TiO2/Fe3O4@C during photocatalytic degradation of trichloroethylene
AU - Hsu, T. F.
AU - Hsiung, T. L.
AU - Wang, James
AU - Huang, C. H.
AU - Wang, H. Paul
N1 - Funding Information:
The financial supports of the Taiwan National Science Council and Bureau of Energy , and NSRRC are gratefully acknowledged. We also thank Prof. Y.W. Yang and Dr. Jyh-Fu Lee of the NSRRC for their EXAFS and XANES experimental assistance.
PY - 2010/7/1
Y1 - 2010/7/1
N2 - Mainly anatase and Fe3O4 in the magnetic photocatalysts (TiO2 on Fe3O4@C core-shell nanoparticles (TiO2/Fe3O4@C)) are observed by X-ray powder diffraction (XRD) spectroscopy. The Ti K-edge least-square fitted XANES spectra of the TiO2/Fe3O4@C photocatalyst indicate that the main titanium species are nanosize TiO2 (9 nm) (77%) and bulky TiO2 (23%). Speciation of titanium in the TiO 2/Fe3O4@C during photocatalytic degradation of 100ppm of trichloroethylene (TCE) has also been studied by in situ X-ray absorption near-edge structural (XANES) spectroscopy. TiO2 is not perturbed during the course of photocatalysis. However, it is worth to note that during photocatalytic degradation of TCE, about 33% of FeO and 67% of Fe 3O4 are observed in the photocatalyst. It seems that the carbon layer on the TiO2/ Fe3O4@C photocatalysts can reduce the possibility for photoexcited electron-hole recombination as usually found on the relatively narrow bandgap of ferric oxide during photocatalysis.
AB - Mainly anatase and Fe3O4 in the magnetic photocatalysts (TiO2 on Fe3O4@C core-shell nanoparticles (TiO2/Fe3O4@C)) are observed by X-ray powder diffraction (XRD) spectroscopy. The Ti K-edge least-square fitted XANES spectra of the TiO2/Fe3O4@C photocatalyst indicate that the main titanium species are nanosize TiO2 (9 nm) (77%) and bulky TiO2 (23%). Speciation of titanium in the TiO 2/Fe3O4@C during photocatalytic degradation of 100ppm of trichloroethylene (TCE) has also been studied by in situ X-ray absorption near-edge structural (XANES) spectroscopy. TiO2 is not perturbed during the course of photocatalysis. However, it is worth to note that during photocatalytic degradation of TCE, about 33% of FeO and 67% of Fe 3O4 are observed in the photocatalyst. It seems that the carbon layer on the TiO2/ Fe3O4@C photocatalysts can reduce the possibility for photoexcited electron-hole recombination as usually found on the relatively narrow bandgap of ferric oxide during photocatalysis.
UR - http://www.scopus.com/inward/record.url?scp=78650293579&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=78650293579&partnerID=8YFLogxK
U2 - 10.1016/j.nima.2009.10.136
DO - 10.1016/j.nima.2009.10.136
M3 - Article
AN - SCOPUS:78650293579
SN - 0168-9002
VL - 619
SP - 98
EP - 101
JO - Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
JF - Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
IS - 1-3
ER -