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Issue 113, 2015
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New hybrid materials based on halogenated metalloporphyrins for enhanced visible light photocatalysis

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Abstract

Photophysical and photochemical studies on 5,10,15,20-tetrakis(2,6-difluoro-5-N-methylsulfamylophenyl)porphyrin (F2PMet) and its cobalt(III) and zinc(II) complexes, including spectroscopic characteristics, photostability and photocatalytic activity, were carried out. The hybrid materials resulting from adsorption of these tetrapyrroles at the surface of titanium dioxide were prepared and examined in terms of their morphological, optical and functional properties applying absorption spectroscopy, scanning electron microscopy (SEM), photoelectrochemistry and photocatalytic tests. Our studies revealed that MF2PMet@TiO2 photocatalysts can be considered as the hybrid organic/inorganic photoactive materials enabling photodegradation of a synthetic opioid such as tramadol hydrochloride (TRML) and a model pollutant, 4-chlorophenol, in aqueous solution under visible light irradiation (λ > 400 nm). To elucidate mechanisms of photochemical processes, the photocatalytic activity of investigated metalloporphyrins was compared in homo- and heterogeneous systems. The results indicate that impregnation of TiO2 (P25) with functionalized porphyrins can improve its photoactivity. ZnF2PMet@TiO2 exhibited a superior photocatalytic performance towards TRML degradation. The role of singlet oxygen and hydroxyl radicals in photodegradation processes has been elucidated both for MF2PMet and MF2PMet@TiO2 systems.

Graphical abstract: New hybrid materials based on halogenated metalloporphyrins for enhanced visible light photocatalysis

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Article information


Submitted
24 Sep 2015
Accepted
27 Oct 2015
First published
27 Oct 2015

RSC Adv., 2015,5, 93252-93261
Article type
Paper
Author version available

New hybrid materials based on halogenated metalloporphyrins for enhanced visible light photocatalysis

J. M. Dąbrowski, B. Pucelik, M. M. Pereira, L. G. Arnaut, W. Macyk and G. Stochel, RSC Adv., 2015, 5, 93252
DOI: 10.1039/C5RA19742B

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