Abstract
A highly efficient photocatalyst was produced by immobilizing V-doped mesoporous TiO2/tetrakis(4-carboxyphenyl)porphyrin (V-TiO2/TCPP) onto SBA-15 walls, and was then investigated for photodecomposition of 2,4-dichlorophenol (2,4-DCP) in aqueous solutions. In the present paper, first, in order to activate titanium dioxide by visible light, the TiO2 mesoporous was doped by vanadium (V-TiO2) and then it was sensitized by tetrakis(4-carboxyphenyl)porphyrin (TCPP). To improve the photocatalytic activity of the prepared catalyst, SBA-15 was functionalized with the prepared V-TiO2/TCPP by pre-anchorage of 3-(aminopropyl)-triethoxysilane via post-synthesis method (V-TiO2/TCPP/SBA). The obtained materials were characterized by UV–Vis absorption, FT-IR spectroscopy, diffuse reflectance (DRS), scanning electron microscopy, X-Ray diffraction, and N2 adsorption–desorption. Furthermore, a comparative study on the photodegradation of 2,4-DCP between V-TiO2/TCPP/SBA and V-TiO2/TCPP composites was performed and the role of SBA-15 was investigated. The results showed that the decomposition efficiency of the 2,4-DCP by using the V-TiO2/TCPP/SBA was much more than that of applying TCPP/V-TiO2 in high initial concentration of pollutant (up to 99 % in 300 mg/L). In addition, the photocatalytic degradations of 2,4-DCP using above photocatalysts all followed a first-order kinetic model. The V-TiO2/TCPP/SBA was recycled four times without significant loss of photocatalytic activity.
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Acknowledgments
The authors gratefully acknowledge the financial support of the Chemistry Department, Iran University of Science and Technology, provided in the form of a Faculty Internal Research Grant awarded to the corresponding author, which provided the necessary funding for this research. The authors would also like to thank the anonymous reviewers for their detailed and insightful comments on an earlier draft of this article.
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Najafian, A., Rahimi, R., Zargari, S. et al. Synthesis and photocatalytic activity of V-doped mesoporous TiO2 photosensitized with porphyrin supported by SBA-15. Res Chem Intermed 42, 3441–3458 (2016). https://doi.org/10.1007/s11164-015-2222-z
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DOI: https://doi.org/10.1007/s11164-015-2222-z