An enhancement in the photocatalytic activity of TiO2 by the use of Pd: the question of layer sequence in the resulting hierarchical structure |
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| Authors: | M Rezaeian-delouei M Ghorbani M Mohsenzadeh |
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| Affiliation: | (1) Department of Material Science & Engineering, Sharif University of Technology, Azadi Street, P.O. Box 11155-9466, Tehran, Iran;(2) Institute for Nanoscience and Nanotechnology, Sharif University of Technology, Azadi Street, P.O. Box 14588-89694, Tehran, Iran;(3) Department of Food Hygiene and Aquaculture, Ferdowsi University of Mashhad, Azadi Street, P.O. Box 91775-1793, Mashhad, Iran; |
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| Abstract: | TiO2 and Pd-modified TiO2 photocatalysts were prepared by sol–gel method. X-ray diffraction (XRD) data showed that the presence of Pd in TiO2 catalyst decreases the crystalline size of TiO2 and stabilizes anatase phase. The study of the photocatalytic activity of the films via Linear Sweep Voltametry (LSV) plots
and antibacterial test against Escherichia coli ATCC 25922—a gram negative bacterium—showed that Pd increases the photocatalytic activity of the coatings. Besides, the sequence
of layer deposition (TiO2 and Pd-modified TiO2) influences the photocatalytic properties. In other words, more photocatalytic activity is obtained when Pd-modified layer
is deposited first. |
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