Abstract
In this study, TiO2 nanoparticles have been doped with fluorine (F‐TiO2) and consequently sensitized with tetra(4‐carboxyphenyl)porphyrin (TCPP/F‐TiO2) or zinc tetra(4‐carboxyphenyl)porphyrin (ZnTCPP/F‐TiO2) to extend their light absorption into the visible region. The prepared photocatalysts were characterized by SEM, XRD, FTIR, and UV‐Vis assays. F‐TiO2 nanoparticles were completely in anatase phase with particle size range of 50−200 nm. Fluorine‐doping of the TiO2 nanoparticles led to a red shift in their absorption spectrum, while did not significantly changed their band gap (from 2.9 to 2.8 eV). ZnTCPP/F‐TiO2 and particularly TCPP/F‐TiO2 nanoparticles displayed improved visible light absorbency with decreased band gap values (1.5 and 2.4 eV, respectively). The photocatalytic activity of the nanoparticles has been studied through degradation of Rhodamine B in aqueous media under UV and visible light irradiation. The prepared photocatalysts showed lower activity than Degussa P‐25 under UV light irradiation. However, under visible light irradiation, F‐TiO2 nanoparticles better photocatalyzed the RhB degradation than Degussa P‐25. Meanwhile, ZnTCPP/F‐TiO2 and mainly TCPP/F‐TiO2 nanoparticles were completely photoactive under visible light irradiation. © 2015 American Institute of Chemical Engineers Environ Prog, 34: 1341–1348, 2015
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