Abstract
The photocatalytic activity of meso-tetraphenylporphyrins with different metal centers (Fe, Co, Mn and Cu) adsorbed on TiO2 (Degussa P25) surface has been investigated by carrying out the photodegradation of methyl orange (MO) under visible and ultraviolet light irradiation. The photocatalysts were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), diffuse reflectance UV (DRS-UV-vis) and infrared spectra. Copper porphyrin-sensitized TiO2 photocatalyst (CuP-TiO2) showed excellent activity for the photodegradation of MO whether under visible or ultraviolet light irradiation. Natural Bond Orbital (NBO) charges analysis showed that methyl orange ion is adsorbed easier by CuP-TiO2 catalyst due to the increase of induced interactions.
Highlights
Due to its nontoxicity, stability, high photocatalytic activity and recyclability the photocatalytic degradation of pollutants on the surface of titanium dioxide (TiO2) has been intensively studied as a way to solve environmental problems [1,2,3]
Natural Bond Orbital (NBO) charges analysis was performed with density functional theory (DFT) in order to explore the influence of metal ion on the photocatalytic activity
When metalloporphyrins was doped on the TiO2, aggregates could be observed clearly from the micrographs of CuP-TiO2 as shown in Figure 1(b), which indicated the strong adsorption occurred between metalloporphyrins and the TiO2 support
Summary
Stability, high photocatalytic activity and recyclability the photocatalytic degradation of pollutants on the surface of titanium dioxide (TiO2) has been intensively studied as a way to solve environmental problems [1,2,3]. Metalloporphyrins have been used as cytochrome P-450 models for the highly efficient homogeneous or heterogeneous oxidation of organic compounds [11,12,13,14,15,16]. They are recognized to be the most promising photosensitizers due to their very strong absorption in the 400–. Li and co-authors reported the efficient degradation of 4-nitrophenol (4-NP) under visible light irradiation, in which the complex structural porphyrins was used as photosensitizer [18]. NBO charges analysis was performed with density functional theory (DFT) in order to explore the influence of metal ion on the photocatalytic activity
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