Synthesis and characterization of porphyrin–TiO2 core–shell nanoparticles as visible light photocatalyst

Abstract

A sol-gel reaction was used to prepare core-shell nanoparticles of 5,10,15,20-tetrakis(pentafluorophenyl)-21H,23H-porphine (PF6) with titania (TiO 2 ) coating. PF6 molecules would self-assemble to form dispersed PF6 nanoparticles in water during dialysis. The resulting PF6-TiO 2 core-shell nanoparticle was characterized using several methods, revealing a thin TiO 2 layer coated on the surface of the PF6 nanoparticles and confirming the chemical composition of the coreshell structures. The absorption spectrum of the PF6-TiO 2 core-shell nanoparticle was extended to 300-500 nm, which greatly enhanced the photocatalytic efficiency in the visible light spectrum compared to that of bare TiO 2 .

Synthesis, electron transfer and photocatalytic activity of TiO2 nanotubes sensitized by meso-tetra(4-carboxyphenyl)porphyrin under visible-light irradiation

“…These results indicated that the H 2 TCPP was successfully chemically absorbed on the surface of TiO 2 nanotubes. [21][22][23][24][25] The lifespan of electron-hole pairs in our samples was investigated via PL emission spectra. The reason is that both carboxy group and phenyl group that existing in the H 2 TCPP belong to electron-withdrawing group, which can absorb the electron of the TiO 2 nanotubes excited by visible light, then the quenching behavior will happen.…”

Porphyrin-Based Nanostructures for Photocatalytic Applications

“…Such junctions can take advantage of the broad sunlight absorption of the organic component and the high charge carrier mobility of the inorganic semiconductor counterpart [ 73 ]. Porphyrin-TiO 2 core-shell nanoparticles have been successfully synthesized using a sol-gel reaction [ 74 ]. The composites combine the desirable properties of both organic and inorganic components and exhibit better MB photodegradation compared to other porphyrin/TiO 2 -based photocatalysts.…”

Porphyrin‐Based Organophotocatalysts

“…Such heterojunctions can take advantage of the two different material classes by allowing for a good combination of the wide absorption spectrum of porphyrins and the high mobility of the inorganic semiconductors. In one work, porphyrin-TiO 2 core-shell nanoparticles have been prepared and exhibit better MB photodegradation than molecular porphyrin sensitized TiO 2 [133]. We also brought together the two materials to give a new configuration of TiO 2 nanotube/H 2 TPP nanoparticle hybrids for PEC water splitting [134].…”