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Fabrication of Ag-Decorated CaTiO3 Nanoparticles and Their Enhanced Photocatalytic Activity for Dye Degradation

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CaTiO3 nanoparticles of 30–40 nm in size were synthesized via a polyacrylamide gel route. Ag nanoparticles with size of 8–16 nm were deposited onto CaTiO3 particles by a photochemical reduction method to yield CaTiO3@Ag composites. The photocatalytic activity of prepared samples was evaluated by degrading methyl orange under ultraviolet irradiation. It is demonstrated that Ag-decorated CaTiO3 particles exhibit an enhanced photocatalytic activity compared to bare CaTiO3 particles. After 60 min of photocatalysis, the degradation percentage of MO increases from 54% for bare CaTiO3 particles to 72% for CaTiO3@Ag composites. This can be explained by the fact that photogenerated electrons are captured by Ag nanoparticles and photogenerated holes are therefore increasingly available to react with OH−/H2O to generate hydroxyl (OH) radicals. OH radicals were detected by fluorimetry using terephthalic acid as a probe molecule, revealing an enhanced yield on the irradiated CaTiO3@Ag composites. In addition, it is found that the addition of ethanol, which acts as an OH scavenger, leads to a quenching of OH radicals and simultaneous decrease in the photocatalytic efficiency. This suggests that OH radicals are the dominant active species responsible for the dye degradation.
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Document Type: Research Article

Publication date: January 1, 2016

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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