TRMC, XPS, and EPR characterizations of polycrystalline TiO porphyrin impregnated powders and their catalytic activity for 4-nitrophenol photodegradation in aqueous suspension
Journal of Physical Chemistry B, ISSN: 1520-6106, Vol: 109, Issue: 25, Page: 12347-12352
2005
- 88Citations
- 51Captures
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Metrics Details
- Citations88
- Citation Indexes88
- 88
- CrossRef82
- Captures51
- Readers51
- 51
Article Description
Characterization of polycrystalline TiO bare or porphyrin impregnated powders, used as photocatalysts for the degradation of 4-nitrophenol (4-NP) in aqueous suspension, was performed by time-resolved microwave conductivity (TRMC) measurements and electronic paramagnetic resonance (EPR) and X-ray photoelectron (XPS) spectroscopies. The presence of porphyrin sensitizers, as the metal-free or Cu [5,10,15,20-tetra (4-tert-butylphenyl)] porphyrin, impregnated onto the TiO surface improved the photocatalytic activity of the bare TiO. TRMC measurements indicate that the number and lifetime of the photoinduced excess charge carriers increase in the presence of the macrocycles, and EPR and XPS spectroscopies support the mechanistic hypotheses based on the photoreactivity experiments. © 2005 American Chemical Society.
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