TiO2-based photocatalysts impregnated with metallo-porphyrins employed for degradation of 4-nitrophenol in aqueous solutions: role of metal and macrocycle

Novel meso-substituted porphyrins: Synthesis, characterization and photocatalytic activity of their TiO2-based composites

“…7). The Co(II), Zn(II) porphyrins (4b, 6b) have slight beneficial effect, and there is no remarkable effect on the free-base porphyrin (1b) compared with bare TiO 2 , these results are similar to our previous studies [47].…”

Impact of Metal Ions in Porphyrin‐Based Applied Materials for Visible‐Light Photocatalysis: Key Information from Ultrafast Electronic Spectroscopy

“…The disappearance of the aggregate peak at 463 nm and the red‐shift in the Soret band (405 to 421 nm in Figure 2 a) are indicative of direct interaction of PP with ZnO nanoparticles 8c. 23 As shown in Figure 2 b, PP in DMSO/water exhibits strong emissions at 630 and 700 nm upon excitation at the Soret band by a laser source at 409 nm. However, after metalation with Fe III and Cu II , steady‐state emission of PP is significantly decreased, indicating non‐radiative processes that can be attributed to fast intersystem crossing to the excited triplet state 24.…”

The impact of TiO2 modifications on the effectiveness of photocatalytic processes [review]

“…Thus its core constitutes a very stable aromatic chromophore system. Impregnation of the TiO2 surface with phthalocyanine derivatives or other dyes enhances the lifetime of the electron-hole pairs in the semiconductor matrix (TiO2), which improves the effectiveness of a catalyst and speeds up the photodegradation process [21,25,[27][28][29][30][31][32].…”

“…The effectiveness of such hybrid systems was proved in many studies i.a. photo-oxidation of 2-propanol in gassolid and liquid-solid systems in the presence of catalysts such as TiO2@LnPc2 (Ln = Sm, Gd, Ho) [21,25,[27][28][29][30][31][32], involving a microstructural anatase matrix, with grain size over 100 nm. Another example is photooxidation of 4-nitrophenol in the water phase, with the use of microanatase impregnated with lanthanide bisphthalocyanines, LnPc2 (Ln = Nd, Sm, Gd, Ho) and/or metalloporphyrins (containing divalent ions of Mn, Fe, Ni and Cu).…”

“…Another example is photooxidation of 4-nitrophenol in the water phase, with the use of microanatase impregnated with lanthanide bisphthalocyanines, LnPc2 (Ln = Nd, Sm, Gd, Ho) and/or metalloporphyrins (containing divalent ions of Mn, Fe, Ni and Cu). It was found that such catalysts may significantly increase the rate and efficiency of the process [21,25,[27][28][29][30][31][32].…”